Статьи в журналах Q1 и Q2 Web of Science
Статьи кафедры АКХиТРЭ в журналах Q1 и Q2 WoS (2020-2022 гг.)
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Название статьи, авторы, номер DOI |
Название журнала, квартиль в Web of Science, год публикации |
Краткая аннотация |
| 1 |
TiO2 nanotube layers decorated by titania nanoparticles as anodes for Li-ion microbatteries
Sopha H., Ghigo C., Ng S., ...Djenizian T., Macak J.M.
10.1016/j.matchemphys.2021.125337 |
Materials Chemistry and Physics, Q2 2022 |
In this work, the utilization of TiO2 nanotube (TNT) layers decorated with TiO2 nanoparticles (NPs) as anodes in Li-ion microbatteries is reported for the first time. Such TiO2 NPs decorated TNT layers possess an increased amount of active material and a higher surface area compared with their non-decorated (blank) counterparts. TNT layers decorated with several different amounts of TiO2 NPs were tested by galvanostatic cycling tests. The capacities of the TiO2 NPs decorated TNT layer anodes increase with the amount of NPs decoration due to the enhancement of the capacitive effect. Indeed, an areal capacity of -126 pAh cm(-2) (vs 88 pAh cm(-2) for the non decorated TNT layer) at the 200th cycle has been obtained after optimizing the NPs loading. On the other hand, a too high NPs loading of the TNT layers leads to a reduced areal capacity due to clogging of the nanotube exteriors and a significant decrease in inner diameter of the nanotubes. |
| 2 |
Quantification of transformation products of rocket fuel unsymmetrical dimethylhydrazine in air using solid-phase microextraction
Bukenov B., Baimatova N., Kenessov B. |
Journal of Separation Science, Q2 2022 |
Quantification of unsymmetrical dimethylhydrazine transformation products in ambient air is important for assessing the environmental impact of heavy rocket launches. There are very little data of such analyses, which is mainly caused by the low number of analytes covered by the available analytical methods and their complexity. A simple and cost-efficient method for accurate simultaneous determination of seven unsymmetrical dimethylhydrazine transformation products in air using solid-phase microextraction followed by gas chromatography-mass spectrometry was developed. The method was optimized for air sampling and solid-phase microextraction from 20-mL vials, which allows full automation of analysis. The extraction for 5 min by Carboxen/polydimethylsiloxane fiber from amber vials and desorption for 3 min provided the greatest analytes' responses, lowest relative standard deviations, linear calibration (R-2 >= 0.99), and limits of detection from 0.12 to 0.5 mu g/m(3). Samples with concentrations 500 mu g/m(3) can be stored at 21 +/- 1 degrees C without substantial losses (1-11%) for up to 24 h, while air samples with concentrations 10 and 50 mu g/m(3) stored for up to 24 h can be used for accurate quantification of only two and four out of seven analytes, respectively. The developed method was successfully tested for the analysis of air above real soil samples contaminated with unsymmetrical dimethylhydrazine rocket fuel. |
| 3 |
Application of a conversion electrode based on decomposition derivatives of Ag4[Fe(CN)6] for aqueous electrolyte batteries
Malchik F., Maldybayev K., Kan T., Kokhmetova S., Kurbatov A., Galeyeva A., Tubul N., Shpigel N., Djenizian T.
10.1039/d2ra00617k |
RSC Advances, Q2 2022 |
The lack of stable electrode materials for water-based electrolytes due to the intercalation and conversion reaction mechanisms encourage scientists to design new or renovate existing materials with better cyclability, capacity, and cost-effectiveness. Ag-4[Fe(CN)(6)] is a material belonging to the Prussian blue family that can be used, as its other family members, as an electrode material with the intercalation/deintercalation reaction or conversion-type mechanism through Ag oxidation/reduction. However, due to the instability of this material in its dry state, it decomposes to AgCN and a Prussian blue residual complex. A possible reason for Ag-4[Fe(CN)(6)] decomposition is discussed. Nevertheless, it is shown that the decomposition products of Ag-4[Fe(CN)(6)] have electrochemical activity due to the reversible oxidation/reduction of Ag atoms in water-based electrolytes. |
| 4 |
Quantification of trace transformation products of rocket fuel unsymmetrical dimethylhydrazine in sand using vacuum-assisted headspace solid-phase microextraction
Zhakupbekova A., Baimatova N., Psillakis E., Kenessov B.
10.1007/s11356-021-17844-1 |
Environmental Science and Pollution Research, Q2 2022 |
Quantification of unsymmetrical dimethylhydrazine transformation products in solid samples is an important stage in monitoring of environmental pollution caused by heavy rockets launches. The new method for simultaneous quantification of unsymmetrical dimethylhydrazine transformation products in sand samples using vacuum-assisted headspace solid-phase microextraction without addition of water followed by gas chromatography-mass spectrometry is proposed. Decreasing air evacuation time from 120 to 20 s at 23 degrees C resulted in increased responses of analytes by 25-46% and allowed obtaining similar responses as after evacuation at -30 degrees C. The best combination of responses of analytes and their relative standard deviations (RSDs) was achieved after air evacuation of a sample (m = 1.00 g) for 20 s at 23 degrees C, incubation for 30 min at 40 degrees C, and 30-min extraction at 40 degrees C by Carboxen/polydimethylsiloxane (Car/PDMS) fiber. The method was validated in terms of linearity (R-2=0.9912-0.9938), limits of detection (0.035 to 3.6 ng g(-1)), limits of quantification (0.12-12 ng g(-1)), recovery (84-97% with RSDs 1-11%), repeatability (RSDs 3-9%), and reproducibility (RSDs 7-11%). It has a number of major advantages over existing methods based on headspace solid-phase microextraction-lower detection limits, better accuracy and precision at similar or lower cost of sample preparation. The developed method was successfully applied for studying losses of analytes from open vials with model sand spiked with unsymmetrical dimethylhydrazine transformation products. It can be recommended for analysis of trace concentrations of unsymmetrical dimethylhydrazine transformation products when studying their transformation, migration and distribution in contaminated sand. |
| 5 |
A review on preparation methods and applications of metal–organic framework-based solid-phase microextraction coatings
Omarova A., Bakaikina N.V., Muratuly A., Kazemian H., Baimatova N.
10.1016/j.microc.2021.107147 |
Microchemical Journal, Q1 2022 |
Metal-organic frameworks have drawn increasing attention in the field of solid-phase microextraction due to their unique porous structure. Solid-phase microextraction coatings based on metal-organic frameworks exhibit large surface area (up to 1458 m2/g), high selectivity, stability (up to 270 extraction/desorption cycles), and extraction efficiency. Although there have been numerous studies on the synthesis of such fibers, many are not commercially available. In situ deposition from solution, chemical vapor deposition, electrodeposition, adhesion, sol-gel, and chemical bonding techniques are discussed among the methods reported to prepare coatings based on a metal-organic framework. Applications of these coatings for the measurement of volatile organic compounds, polycyclic aromatic hydrocarbons, persistent organic pollutants, phenols, and polychlorinated biphenyls are reviewed and critically discussed. The concluding remarks outline technical challenges and future potential of metal-organic framework based solid-phase microextraction fibers. |
| 6 |
Enhancing Electrochemical Performance of Stretchable/Flexible Li-Ion Microbatteries by Tuning Microstructured Electrode Dimensions
Albertengo A., Nasreldin M., Ramuz M., ...Lepikhin M., Galeyeva A.K., Malchik F., Djenizian T.
10.1002/admi.202102541 |
Advanced Materials Interfaces, Q2 2022 |
Increasing surface area between electrodes and electrolytes drastically has proven to improve electrochemical performances of microbatteries. 3D surface enhancement owing to the design of micropillar electrodes has permitted to fulfill this need while maintaining the same footprint area. Lithium nickel manganese oxide (cathode) and Lithium titanate (anode) micropillars with different sizes are successfully fabricated on aluminum foils by laser ablation technique and are then separated by a polymer electrolyte to form stretchable lithium-ion microbatteries. The electrochemical performance of full batteries composed of different micropillar sizes is studied in detail. The importance of controlling the width of micropillars is demonstrated and correlated with a simple theoretical model to optimize the battery properties. It is also shown that areal capacity values can be enhanced by improving the electrode/electrolyte interfaces using a simple treatment under vacuum. |
| 7 |
Anodic TiO2 nanotubes: A promising material for energy conversion and storage
Galstyan V., Macak J.M., Djenizian T.
10.1016/j.apmt.2022.101613 |
Applied Materials Today, Q1 2022 |
Self-organized TiO2 nanotube (TNT) layers formed by an anodization process have emerged for the conception of innovative systems in the conversion and storage of energy. Herein, the latest progress in power sources with a remarkable electrochemical performance involving these versatile nanomaterials is reported. Besides the key role of their physico-chemical properties, the significance of interfaces established with other materials to achieve the fabrication of batteries, supercapacitors and fuel cells showing high electrochemical performance is also high-lighted. Particularly, recent approaches based on the chemical modifications of the TNTs by doping, solid-state reactions, atomic layer deposition, electrodeposition of metallic nanoparticles and copolymers are presented. In addition, the strong potential offered by TNT layers for future research works is discussed. This progress report seeks to demonstrate the strong input of anodic TNT layers for developing the next generation of autonomous devices while stimulating more research efforts dedicated to modern technological applications. |
| 8 |
Mini-Hydropower Plant Based on Lenyov Hydrobelt and Volume-Sectional Hydraulic Engine
Zhilkashinova A., Abilev M., Ocheredko I., Tuyakbayev B., Nurbayev M., Azamatov B.
10.3390/pr10020368 |
Processes, Q2 2022 |
The use of the energy of small watercourses with the help of small hydropower plants is one of the promising directions for the development of renewable energy. This article presents the designs of two different hydraulic engines, each of which has its own advantage. Therefore, the task of calculating the real parameters of the design of a mini-hydropower plant based on Lenyov hydrobelt has been solved. Theoretical calculations were validated numerically by the finite volume method and computational fluid dynamics modeling; both methods gave similar results. According to the results of calculations, this design based on the Lenyov hydrobelt with the capacity of 16 kW is advisable to place in a river with a flow velocity of at least 4.5 m/s. The article also presents an alternative type of developed mini-hydropower plant, -a volume-sectional hydraulic engine. The proposed rotary-type positive displacement hydraulic engine can operate at low pressure on a flat surface. The advantage of the hydraulic engine is the sectional operation of several working chambers. It was established that a high water velocity and a large volume of passing water was not required. The total force acting in the hydraulic engine is 5430.19 N. Due to the use of conical inlet channels, the water flow velocity was increased and the water flow became directional. The frequency of rotation of the hydraulic engine shaft at a river flow velocity of 4 m/s was 60.43 rpm. The received power in these modes was 22.25 kW. |
| 9 |
Effect of Heat Treatment on the Structural-Phase State and Properties of a Multilayer Co-Cr-Al-Y Coating
Skakov M., Zhilkashinova A., Zhilkashinova A., Abilev M., Prokhorenkova N., Agelmenev M., Ismailova A.
10.3390/cryst12081056 |
Crystals, Q2 2022 |
The article describes the effect of heat treatment on the structural-phase state and properties of a multilayer Cr-Al-Co-Y coating obtained by magnetron sputtering. Heat treatment was carried out at 400, 800 and 1000 degrees C. The study of the microstructure was carried out by electron microscopy with energy dispersive analysis and powder X-ray diffraction. The surface of the samples was studied by atomic force microscopy. The thickness of the Co-Cr-Al-Y coatings was 1.5-1.7 +/- 0.2 mu m. The obtained coatings are characterized by a hardness of 4.7-6.4 GPa. A distinctive feature of the layers is the absence of a crystalline structure in some areas of the coating. The main process occurring during the thermal treatment is the formation of a spinel-type phase. For a single-layer sample after heat treatment at 400 degrees C, it was not possible to fix extraneous reflections except for the reflections of the silicon substrate 111 and 220. For the rest of the samples, the appearance of reflections of a number of phases was noticed, such as: SiO2, CoO, AlSi0.5O2.5 and CrAl(0.4)2Si(1.58). An increase in the treatment temperature up to 800 degrees C did not lead to significant changes. In the case of the multilayer sample, the reflections of various impurity phases disappeared and the Co3O4 phase was formed. For samples treated at 1000 degrees C, the formation of a spinel-type phase (Co3O4-CoCr2O4) was observed in all cases. Data on the structural-phase state and properties of the multilayer Co-Cr-Al-Y coating can be used to predict the nature of such coatings after heat treatment. |
| 10 |
Recent demulsification methods of crude oil emulsions – Brief review
Faizullayev S., Adilbekova A., Kujawski W., Mirzaeian M.
10.1016/j.petrol.2022.110643 |
Journal of Petroleum Science and Engineering, Q1 2022 |
The oil industry faces with crude oil emulsions formation issue.It is a common problem for the most of oilproducing countries around the world, including the Republic of Kazakhstan. Mainly, water-in-oil type of emulsions (or reverse emulsions) are formed during oil extraction and transportation. The presence of water in crude oil causes an increase in the cost of oil processing and transportation and consequently increases the cost of oil refinery products. It also induces corrosion of equipment when oil is extracted and transported. In this paper, several major methods of demulsification based on chemical, membrane, electric, magnetic, microwave separation used for the breaking of water-in-oil emulsions in recent years are reviewed and their advantages and disadvantages are highlighted. It is shown that it is important to create cost-efficient and smart demulsifiers of stable oil emulsions including their ecological friendly characteristics. Therefore, the future perspective research areas include the development of sustainable and alternative demulsification methods which are in demands today. In addition, the development of the effective combination of destabilization methods is still relevant today to achieve the synergetic effect in dewatering of highly stable oil emulsions. |
| 11 |
Natural Material Shungite as Solid-Phase Extraction Sorbent for the Extraction of Red Synthetic Dye Ponceau 4R from Tap Water, Wine, and Juice
Alham A., Ibraimov A., Alimzhanova M., Mamedova M.
10.1007/s12161-021-02162-6 |
Food Analytical Methods, Q2 2022 |
A natural nanomaterial shungite (NMSh) was used as solid-phase extraction (SPE) absorbent and showed excellent absorption capacity for red synthetic dye. NMSh is a mixture of various carbon allotropes, which is used as an inexpensive and effective sorbent in various scientific and food research around the world. NMSh is not just amorphous carbon, but the mixture of various carbon allotropes; shungite has been categorized as a promising material for the development of nanotechnology, which is of great interest for the development of science and technology. This fact served as the basis for selecting shungite as a material to create sorbents that will be used in the preparation of samples for analysis. For the determination of the red synthetic dye Ponceau 4R in samples of wine and juice, an SPE method with NMSh packed cartridge combined with HPLC-UV detection was developed to determine Ponceau 4R in tap water, wine, and juice samples. Particle size and mass of NMSh sorbent were studied, and a comparison between activated and non-activated NMSh was made for use as a sorbent. Under optimized conditions, the extraction of analyte was 99.3% for wine and 94.3% for juice with relative standard deviations (RSD) during the day equal to 0.18% for juice and 0.15% for wine. The results showed that this method is very sensitive and effective for the determination of food dyes in very complex matrices and in a low concentration. Based on the study was developed the method to determine the dyes in alcoholic and non-alcoholic drinks. |
| 12 |
Modern Analytical Methods for the Analysis of Pesticides in Grapes: A Review
Syrgabek Y., Alimzhanova M.
10.3390/foods11111623 |
Foods, Q1 2022 |
Currently, research on the determination of pesticides in food products is very popular. Information obtained from research conducted so far mainly concerns the development of a methodology to determine the content of pesticides in food products. However, they do not describe the content of the pesticide used in viticulture in the resulting product. Over the past decade, this study has examined analytical methodologies for assessing pesticide residues in grapes. Scopus, Web of Science, Science Direct, PubMed, and Springer databases were searched for relevant publications. The phrases "pesticides" and "grapes" and their combinations were used to search for articles. The titles and annotations of the extracted articles have been read and studied to ensure that they meet the review criteria. The selected articles were used to compile a systematic review based on scientific research and reliable sources. The need to study the detection of pesticide residues in grapes using advanced analytical methods is confirmed by our systematic review. This review also highlights modern methods of sample preparation, such as QuEChERS, SPME, PLE, dLLME, and ADLL-ME, as well as the most used methods of separation and identification of pesticides in grapes. An overview of the countries where residual grape pesticide amounts are most studied is presented, along with the data on commonly used pesticides to control pests and diseases in grape cultivation. Finally, future possibilities and trends in the analysis of pesticide residues in grapes are discussed by various analytical methods. |
| 13 |
Miniaturized solid-phase microextraction coupled with gas chromatography-mass spectrometry for determination of endocrine disruptors in drinking water
Alimzhanova M., Mamedova M., Ashimuly K., Alipuly A., Adilbekov Y.
10.1016/j.fochx.2022.100345 |
Food Chemistry: X, Q1 2022 |
A simple and rapid method based on miniaturized solid-phase microextraction (mini-SPME) followed by gas chromatography-mass spectrometry was developed to identify eight endocrine disruptors (atrazine, diethylstilbestrol, hexestrol, estrone, estradiol, ethinylestradiol, norgestrel, and megestrel) in drinking water samples. Extraction parameters was optimized and further analyses was performed using them. The optimum temperature for the determination of endocrine disruptors in water was 80 degrees C; the optimum extraction and preincubation times were 60 and 20 min, respectively. The studied linear range of endocrine disruptors was 10.0-1000 mu g mL(-1). The limit of detection ranged from 0.020 to 0.087 mu g mL(-1). The correlation coefficient (r(2)) was 0.96-0.99. This research introduces a novel method for detecting analytes at extremely low concentrations, as well as the possibility of combining several detection technologies to give high-accuracy qualitative and quantitative determination of endocrine disruptors in aqueous samples. |
| 14 |
Phosphogypsum conversion under conditions of SC-CO2
Tokpayev R., Khavaza T., Ibraimov Z., Kishibayev K., Atchabarova A., Abdimomyn S., Abduakhytova D., Nauryzbayev M.
10.1016/j.jcou.2022.102120 |
Journal of CO2 Utilization, Q1 2022 |
This article looks into process of supercritical-CO2 phosphogypsum (PG) conversion, which is production residue after making mineral fertilizers by "Kasphosphate" LLC. Nowadays, over 30 million tons of PG have been accumulated in Kazakhstan; its background radiation is low enough to recycle it into valuables such as construction materials, rare earth elements and strontium salts. Complete factorial experiment method was used to describe conversion process; conversion of PG into CaCO3 was optimized using simplex method. Conversion optimization outcomes show possibility of using fewer reagents and shortening conversion process compared to existing technologies. Conversion degree is 87% after 10 min at 33 degrees C. Conversion was carried out at semiindustrial supercritical equipment with maximum CO2 flow rate up to 5000 g/min and integrated CO2 recirculation system. Characteristics of initial PG samples and conversion products/semi-products were done using Xray phase analysis, scanning electron microscopy, atomic absorption spectroscopy, ICP-MS, and gravimetric procedure. In order to obtain purer CaCO3 PG was cleared of water-soluble impurities beforehand. As conversion result, finely dispersed CaCO3 and Ca(HCO3)2 as well as Na2SO4 solution were obtained. |
| 15 |
Role of carbon material surface functional groups on their interactions with aqueous solutions
Atchabarova A.A., Abdimomyn S.K., Abduakhytova D.A., Zhigalenok Y., Tokpayev R., Kischibayev K., Khavaza T., Kurbatov A., Zlobina Y.V., Djenizian T.J.
10.1016/j.jelechem.2022.116707 |
Journal of Electroanalytical Chemistry, Q1 2022 |
In this work, the fundamental study of the surface functional groups' role of the carbon material based on walnut shells in water solutions was studied. Functional groups (FG) were evaluated by Boehm???s titration method, electrochemical impedance spectroscopy, spectrophotometric method, etc. The surface oxygen-containing functional groups (OCFG) was determined quantitatively by Boehm method: C(-C-OH) = 1.15 mmol/g; C(-C=O) = 0.87 mmol/g; C(???COOH) = 6.31 mmol/g. By the method of edge angle wetting the influence of OCFG on the formation of a hydrophilic functional layer on the surface of carbon material at different electrolyte media and adhesion works were found. The results of ?? -potential measurements as a function of solution pH allowed us to characterize the surface redox (acid-base) centers of the carbon material. Electrochemical impedance spectroscopy results show that surface OCFGs have a large influence on carbon material capacity characteristics. |
| 16 |
Modeling the effect of temperature on solid-phase microextraction of volatile organic compounds from air by polydimethylsiloxane coating using finite element analysis
Kapar A., Muratuly A., Orazbayeva D., Bakaikina N., Bukenov B., Kenessov B.
10.1016/j.aca.2022.339431 |
Analytica Chimica Acta, Q1 2022 |
A development of analytical methods based on solid-phase microextraction (SPME) is a very time- and labor-consuming task. The finite element methods have found a wide application in SPME modeling for faster and more accurate optimization of analytical methods. In this work, a computational model for predicting the effect of temperature on extraction of VOCs from air onto SPME coating based on polydimethylsiloxane (PDMS) has been developed using COMSOL Multiphysics (R) (CMP) software. Most suitable methods and models for estimating the diffusion coefficients of analytes in air and coating, and coating-air distribution constants of the analytes at different extraction temperatures were chosen. The Fuller method was chosen for calculating diffusion coefficients of analytes in air due to its simplicity and reliability. Coating-air distribution constants at different temperatures were estimated using van't Hoff equation. A combination of inverse gas chromatography on a capillary column with a similar stationary phase for estimating diffusion coefficients and linear temperature programmed retention indices (LTPRI) for estimating coating-air distribution constants at initial temperature were chosen for modeling purposes because in most cases it provided lowest values of root-mean-square difference from experimental extraction profiles from 125 mL bulb at 25 and 40 degrees C. The developed model can be recommended for faster and simpler optimization of the methods of air sampling using PDMS SPME fiber. It can also be used for obtaining extraction profiles at fluctuating temperatures. |
| 17 |
Chromatographic determination of pesticides in soil: Current trends in analysis and sample preparation
Orazbayeva D., Muratuly A., Bektassov M., Zhakupbekova A., Kenessov B.
10.1016/j.teac.2022.e00174 |
Trends in Environmental Analytical Chemistry, Q1 2022 |
Soil is a primary sink and reservoir for pesticides pollution and one of the priority objects in terms of pesticides safety guidelines. Pesticides??? analysis in soil is a field of research which is in constant development facing numerous challenges such as the increasing amount and variety of analytes and their combinations, as well as the increasing demand for faster, simpler, more accurate and multiresidue analysis. This review provides the sum-mary of studies on pesticides analysis in soil based on chromatography-coupled methods published between 2015 and 2022. We discuss the shift toward faster, greener, and simpler alternatives to conventional techniques, application of sample preparation and detection methods to targeted and untargeted pesticide analysis, as well as the developments in stereoselective determination of chiral pesticides. The sample preparation methods such as solid-phase extraction, dispersive solid-phase extraction, and derived methods, as well as the recent trends and developments in chromatographic separation of pesticides are covered in this review. For sample preparation, the QuEChERS method is replacing other techniques and has proved to be efficient in both screening and ac-curate quantification in multiresidue analysis. Shift towards minimal sample preparation is supported by a wider application of highly sensitive and selective separation and detection systems such as LC-MS/MS. The features of different methods of sample preparation and detection are discussed with focus on optimal parameters, ad-vantages, and drawbacks. The optimal parameters of sample preparation methods were summarized based on respective publications, which makes the review a useful tool for method development and further investigations. |
| 18 |
A cost-effective water-in-salt electrolyte enables highly stable operation of a 2.15-V aqueous lithium-ion battery
Turgeman M., Wineman-Fisher V., Malchik F., ...Shpigel N., Aurbach D.
10.1016/j.xcrp.2021.100688 |
Cell Reports Physical Science, Q1 2022 |
Extensive efforts are currently underway to develop safe and cost-effective electrolytes for large-scale energy storage. In this regard, water-based electrolytes may be an attractive option, but their narrow electrochemical stability window hinders their realization. Although highly concentrated fluorinated electrolytes have been shown to be highly effective in suppression of water splitting, enabling significant widening of the applied potential range, they utilize expensive salts (e.g., lithium bis(trifluoromethane sulfonyl) imide [LiTFSI] or lithium trifluoromethane sulfonate [LiOTf]); hence, they cannot be considered for practical applications. Here, we demonstrate a cost-effective aqueous electrolyte solution combining 14 M LiCl and 4 M CsCl that allows stable operation of a 2.15-V battery comprising a TiO2 anode and LiMn2O4 cathode. Addition of CsCl to the electrolyte plays a double role in system stabilization: the added chloride anions interact with the free water molecules, whereas the chaotropic cesium cations adsorb at the electrified interface, preventing hydrogen formation. |
| 19 |
Development of Electroactive and Stable Current Collectors for Aqueous Batteries
Bergman G., Nimkar A., Saha A., Malchik F.,...Sharon D., Shpigel N.
10.1149/1945-7111/ac6c0c |
Journal of the Electrochemical Society, Q2 2022 |
The need for low-cost, high-safety batteries for large-scale energy storage applications has sparked a surge in research of rechargeable aqueous batteries. While most research efforts are focused on the development of electrolyte formulations and electrode materials, it appears that the current collector impact on the battery performance is frequently overlooked. Even though the current collector is traditionally thought of as an inactive battery component, it is included in the battery energy density calculations, making its activation desirable. Furthermore, poor current collector selection can cause irreversible side reactions, resulting in rapid cell efficiency decay. Herein we propose a new approach to design current collectors that makes use of anodized Ti. The redox-active anodized Ti significantly improves the overall anode capacity and provides effective inhibition of hydrogen formation on the electrified interface. The use of TiO2 particles on an anodized Ti current collector in an aqueous electrolyte solution resulted in capacity of 130 mAh g(-1) and exceptional capacity retention of 99% after 1000 cycles. Although the concept of active current collectors needs to be refined before it can be implemented in commercial cells, our findings indicate that this approach could be useful for improving overall cell performance without requiring significant changes to its configuration. |
| 20 |
Unique Mechanisms of Ion Storage in Polyaniline Electrodes for Pseudocapacitive Energy Storage Devices Unraveled by EQCM-D Analysis
Turgeman M., Bergman G., Nimkar A., Malchik F., ...Shpigel N., Aurbach D.
10.1021/acsami.2c13771 |
ACS Applied Materials and Interfaces, Q1 2022 |
The optimal performance of organic electrodes for aqueous batteries requires their full compatibility with selected electrolyte solutions. Electrode materials having 1-3-dimensional structures of variable rigidity possess a confined space in their structure filled with water and electrolyte solutions. Depending on the rigidity and confined space geometry, insertion and extraction of ions into electrode structures are often coupled with incorporation/withdrawal of water molecules. Aside from the scientific interest in understanding the charging mechanism of such systems, co-insertion of solvent molecules affects strongly the charge storage capability of the electrodes for energy storage devices. We present herein in situ electrochemical quartz crystal microbalance with dissipation monitoring (EQCM-D) investiga-tions of polyaniline (PANI) electrodes operating in various aqueous Na+-containing electrolytes, namely, Na2SO4, NaClO4, NaBF4, and NaPF6. Careful analysis of the EQCM-D results provides a dynamic snapshot of the mixed anionic/protonic fluxes and the accompanying water molecules' insertion/extraction to/from the PANI electrodes. Based on our observations, it was found that the charging mechanism, as well as the capacity values, strictly depends on the electrolyte pH, the chaotropic/kosmotropic character of the anionic dopants, and the amount of the extracted water molecules. This study demonstrates the effectiveness of analysis by EQCM-D in selecting electrolytes for batteries comprising organic electrodes. |
| 21 |
Peculiarities of adsorption of Cr (VI) ions on the surface of Chlorella vulgaris ZBS1 algae cells
Tattibayeva Z., Tazhibayeva S., Kujawski W., Zayadan B., Musabekov K.
10.1016/j.heliyon.2022.e10468 |
Heliyon, Q2 2022 |
Cr (VI) compounds are the most dangerous for human health and the environment, therefore, the study of their adsorption features is of great interest. A comprehensive study of the adsorption of Cr (VI) ions on the surface of Chlorella vulgaris ZBS1 algae cells was carried out evaluating the effect of the pH of the medium on the degree of removal of Cr (VI) ions from solutions and on the zeta potential of the cell surface was. The highest values of the degree of removal of Cr (VI) ions equal to 94.6-95.4% are achieved in the pH range of 1-2, being the result of the electrostatic attraction of HCrO4 groups to protonated amino groups of the cell surface and the possibility of reducing Cr (VI) ions to Cr (III) in an acidic medium, followed by the formation of Cr (III) ions of coordination bonds with amine and carboxyl groups of algae cells. The adsorption data were processed within the framework of Langmuir, Freundlich, Dubinin-Radushkevich and Temkin models. It was shown that the maximum Langmuir adsorption value was 74.63 mg/g. The values of the adsorption parameters 1/n and Kf in the Freundlich model were equal to 0.713 and 2.82 mg/g. In the DubininRadushkevich model, the maximum adsorption capacity (qm) and free energy (E) were equal to 39.73 mg/g and 2.604 kJ/mol, respectively. Whereas, according to the Temkin model, the constant A was equal to 18.215 L/mg, and bT was equal to 0.023 kJ/mol. Taking into account the low values of free energy, it is concluded that adsorption is caused by non-covalent interactions. The study of adsorption kinetics showed that the adsorption of Cr (VI) ions on the surface of Chlorella vulgaris ZBS1 algae cells is described in the framework of the pseudo-second order model. The kinetic behavior of the process is discussed in the framework of the IPDM and ELM models. With increasing temperature, the constant of intraparticle diffusion of Cr (VI) ions decreases, which is explained with increasing of hydrophobic interactions between nonpolar sites of protein macromolecules and polysaccharides in the composition of algae cells. The increase in the adsorption of Cr (VI) ions at pH 8.62 in the temperature range of 298-353 K is justified by the shrinkage of the biosorbent volume, which leads to the blocking of a part of the anionic groups on the surface of algae cells. Therefore, the decrease in the electrostatic repulsion between the negatively charged surface of the adsorbent and Cr (VI) oxyanions is observed. |
| 22 |
High conductivity PEDOT:PSS through laser micro-annealing: mechanisms and application
Troughton J., Peillon N., Borbely A., ...Djenizian T., Ramuz M.
10.1039/d2tc03812a |
Journal of Materials Chemistry C, Q1 2022 |
Conductive polymers represent the next generation of soft, flexible electronics. Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is among the most widely used of these, despite having a relatively low conductivity when deposited in the standard form with no additional chemical dopants. This is often mitigated through chemical doping, but this is associated with changes in processing easy, mechanical stability, or compatibility. This paper reports a laser micro-annealing process for PEDOT:PSS, including process optimisation, investigation of the underlying mechanism, and application in organic electronics. The laser micro-annealing increases the material conductivity from 1 S cm(-1) to around 360 S cm(-1) without any additive or post-deposition chemical treatments. This process is used, along with a laser ablation step, to fabricate organic electrochemical transistors (OECTs). These show comparable performance to material fabricated with common additives, while allowing rapid production of myriad devices. The additive and photolithography free processes enables simple fabrication of devices without the processing complications introduced by the use of additional chemicals. Following process optimisation, detailed study of the material properties suggests the dominant mechanism for this conductivity enhancement is the agglomeration of PEDOT cores within the film, facilitated by the moderate local heating action of the laser. |
| 23 |
What about manganese? Toward rocking chair aqueous Mn-ion batteries
Nimkar A., Chae M.S., Wee S., Malchik F., ...Shpigel N., Mandler D.
10.1021/acsenergylett.2c02242 |
ACS Energy Letters, Q1 2022 |
The emerging interest in aqueous rechargeable batteries has led to significant progress in the development of next-generation electrolytes and electrode materials enabling reversible and stable insertion of various multivalent ions into the electrode's bulk. Yet, despite its abundance, high salt solubility, and small ionic radius, the use of manganese ions for energy storage purposes has not received sufficient attention. Herein, we present the use of Mo6S8 (Chevrel phase) as an anode for Mn2+ insertion. By careful optimization of the electrolyte solution, high-capacity values exceeding 90 mAh/g and long-term stability (more than 1500 cycles) have been obtained. Based on in situ XRD analysis, the charging mechanism and the associated structural changes occurring during Mn2+ insertion have been carefully studied. Finally, we demonstrate for the first time a rocking chair aqueous Mn-ion battery comprising a Chevrel anode and NiHCF cathode. |
| 24 |
Can Anions Be Inserted into MXene?
Shpigel N., Chakraborty A., Malchik F., Bergman G., Nimkar A., Gavriel B., Turgeman M., Hong C.N., Lukatskaya M.R., Levi M.D., Gogotsi Y., Major D.T., Aurbach D.
10.1021/jacs.1c03840 |
Journal of the American Chemical Society, Q1 2021 |
Despite the continuous progress in the research and development of Ti3C2Tx (MXene) electrodes for high-power batteries and supercapacitor applications, the role of the anions in the electrochemical energy storage and their ability to intercalate between the MXene sheets upon application of positive voltage have not been clarified. A decade after the discovery of MXenes, the information about the possibility of anion insertion into the restacked MXene electrode is still being questioned. Since the positive potential stability range in diluted aqueous electrolytes is severely limited by anodic oxidation of the Ti, the possibility of anion insertion was evaluated in concentrated aqueous electrolyte solutions and aprotic electrolytes as well. To address this issue, we have conducted in situ gravimetric electrochemical quartz crystal microbalance with dissipation monitoring (EQCM-D) measurements in highly concentrated LiCl and LiBr electrolytes, which enable a significant extension of the operation range of the MXene electrodes toward positive potentials. Also, halogens are among the smallest anions and should be easier to intercalate between MXene layers, in comparison to multiatomic anions. On the basis of mass change variations in the positive voltage range and complementary density functional theory calculations, it was demonstrated that insertion of anionic species into MXene, within the range of potentials of interest for capacitive energy storage, is not likely to occur. This can be explained by the strong negative charge on Ti3C2Tx sheets terminated by functional groups. |
| 25 |
Titanium Carbide MXene Shows an Electrochemical Anomaly in Water-in-Salt Electrolytes Wang X., Mathis T.S., Sun Y., Tsai W.-Y., Shpigel N., Shao H., Zhang D., Hantanasirisakul K., Malchik F., Balke N., Jiang D., Simon P., Gogotsi Yu.
10.1021/acsnano.1c06027 |
ACS Nano, Q1 2021 |
Identifying and understanding charge storage mechanisms is important for advancing energy storage. Well-separated peaks in cyclic voltammograms (CVs) are considered key indicators of diffusion-controlled electrochemical processes with distinct Faradaic charge transfer. Herein, we report on an electrochemical system with separated CV peaks, accompanied by surface-controlled partial charge transfer, in 2D Ti3C2Tx MXene in water-in-salt electrolytes. The process involves the insertion/desertion of desolvation-free cations, leading to an abrupt change of the interlayer spacing between MXene sheets. This unusual behavior increases charge storage at positive potentials, thereby increasing the amount of energy stored. This also demonstrates opportunities for the development of high-rate aqueous energy storage devices and electrochemical actuators using safe and inexpensive aqueous electrolytes. |
| 26 |
Influences of Cations’ Solvation on Charge Storage Performance in Polyimide Anodes for Aqueous Multivalent Ion Batteries
, , , , , , , Cohen R., , ,
|
ACS Energy Letters, Q1 2021 |
Among the examined organic electrodes for aqueous mono and multivalent ions batteries, polyimide is considered a promising candidate because of its high capacity and good cyclability in different electrolyte solutions. While most of the studies so far were focused on the energetic performance of polyimide anodes, much less is known about their charge storage mechanism and particularly how such electrodes are affected by the solvation properties of the inserted cations. Using in situ EQCM-D, a direct assessment of the cationic fluxes and their hydration shells inserted/extracted to/from PI electrodes upon potential application was performed for a large variety of mono and multivalent cations. Our observations demonstrated a pronounced withdrawal of water molecules from the polymeric electrodes during insertion of chaotropic cations and significantly less water withdrawal upon insertion of kosmotropic cations. These findings are well correlated with the capacity and the rate capability of the polyimide electrodes in the examined systems and shed light on their charge storage mechanism. |
| 27 |
Synthesis and evaluation of corrosion inhibitory and adsorptive properties of N-(beta-ethoxypropionitrile-N,N-bis(2-hydroxyethylethoxy) fatty amide
Rakhymbay G., Jumanova R., Avchukir K., Bakhytzhan Ye., Argimbayeva A., Burkitbayeva B., Turmukhanova M., Vacandio F., Adeloye A.
10.1098/rsos.211066
|
Royal Society Open Science, Q1 2021 |
The present study reports a synthetic condensation process of a vegetable oil (waste) reacted with triethanolamine, maleic anhydride and acrylonitrile in (1: 1.2: 2: 1) mole ratios to obtain N-(β-ethoxypropionitrile)-N,N-bis(2-hydroxyethylethoxy) fatty amide as a major inhibitory product. Corrosion property of steel in a 3% NaCl solution in the presence of a potential inhibitor was investigated using weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods. These methods gave consistent results, from which it is noticeable that inhibition efficiency increases with the increasing concentration of the inhibitor. Gravimetric studies show an increase in the sample mass at an inhibitor concentration of 10 mM, indicative of adsorbed film formation on the surface. The polarization curve results showed that the compound demonstrates itself as an anodic-type inhibitor. A rise in polarization resistance values in the EIS measurements also confirmed that the compound acts as an effective inhibitor of steel corrosion. Furthermore, the R(CR)(QR) equivalent circuit was used to interpret the results obtained in the investigation of the corrosion behaviour of steel in solution with an inhibitor. The standard adsorption free energies calculated from the Langmuir isotherm indicate that adsorption takes place by physical and chemical mechanisms. The presence of adsorbed protective film was confirmed by FT-IR spectrum and SEM micrographs. |
| 28 |
Physical and chemical properties of activated carbon synthesized from plant wastes and shungite for CO2 capture
Kishibayev K.K., Serafin J., Tokpayev R.R., Khavaza T.N., Atchabarova A.A., Abduakhytova D.A., Ibraimov Z.T., Sreńscek-Nazzal J.
10.1016/j.jece.2021.106798 |
Journal of Environmental Chemical Engineering, Q1 2021 |
Highly microporous inexpensive activated carbons have been prepared using a physical activated method based on biomass (corn cobs, grape seeds, birch, and pine cones) and shungite minerals. These materials were investigated as sorbents for CO2 adsorption. Textural characterization of these activated carbons were measured by nitrogen adsorption-desorption at 77 K, scanning electron microscopy, FTIR spectroscopy, XRD, Raman spectrometry, elemental analysis by XRF. The specific surface area values were on the range 424–738 m2·g−1 and total pore volume from 0.27 cm3·g−1 to 0.50 cm3·g−1. The highest CO2 capture capacity received Birch activated carbon 4.50 mmol·g−1 and 4.06 mmol·g−1at 273 K and 298 K, respectively. The CO2 adsorption seems to depend on the presence of narrow micropores (<1 nm) rather than on the pore volume or surface area of activated carbons. Therefore, these microporous carbons exhibit a high CO2 capture rate. Furthermore, birch showed good selectivity up to 91.3 for CO2-N2 separation and can be easily regenerated after 1, 5, 10, 15 cycles. |
| 29 |
New in situ solvothermally synthesized metal-organic framework MOF-199 coating for solid-phase microextraction of volatile organic compounds from air samples
Omarova, A., Baizhan, A., Baimatova, N., Kenessov, B., Kazemian, H.
10.1016/j.micromeso.2021.111493 |
Microporous and Mesoporous Materials, Q1 2021 |
The development of new solid-phase microextraction coatings has attracted more attention due to a limited number of commercially available fibers and their inherent shortcomings, such as low effectiveness when extracting polar compounds, poor selectivity, and possible swelling upon exposure to certain solvents. In recent years, an increased interest has developed in the synthesis of SPME fiber coatings based on metal-organic frameworks, which are promising due to their permanent porosity, large surface area, and high mechanical and thermal stability. The in situ solvothermal method was employed in developing a new MOF-199-based coating on an etched stainless-steel core. Optimal MOF-199 deposition on the core was achieved after 16 h reaction time using 96.5% (v/v) ethanol as a solvent. The extraction effectiveness of 25 volatile organic compounds from the air (at 150 and 15 μg/m3) was evaluated using the newly developed SPME fiber with 22 ± 3 μm thickness and compared with two commercially available fibers - 65 μm polydimethylsiloxane/divinylbenzene and 85 μm Carboxen/polydimethylsiloxane. In comparison with polydimethylsiloxane/divinylbenzene, the MOF-199-based fiber provided 1.3–82.3 times higher responses of 16 volatile organic compounds, as obtained using gas chromatography-mass spectrometry. The responses of five volatile organic compounds obtained using the MOF-199-based fiber were in the same range as those from Carboxen/polydimethylsiloxane fiber. The newly developed fiber exhibited a greater selectivity toward low molecular volatile organic compounds. The extraction effectiveness of the MOF-199-based fiber for nine volatile organic compounds ranged between 35 and 88%, with distribution constants in the range of 9.4 × 104 to 127 × 104. |
| 30 |
Remediation of soil contaminated by toxic rocket fuel components using modified carbon–mineral adsorbing material produced from shungite rock modified with Mn4+ and Fe3+
Efremov S., Nechipurenko S., Tokmurzin D., Kaiaidarova A., Kalugin S., Tassibekov K.
10.1016/j.eti.2021.101962 |
Environmental Technology & Innovation, Q1 2021 |
The study develops a novel catalytic adsorption material for remediation of soils contaminated by toxic rocket fuel components (RFC). Modified carbon–mineral material (MCMM) sorbent is produced using shungite rock and modified using iron (III) chloride and manganese (IV) oxide. MCMM production process is developed, and MCMM remediation efficiency is tested using soil samples from rocket separating parts impact sites with RFCs contamination. The structure of shungite and the physicochemical parameters of MCMM, the soils contamination at the impact areas of the rocket separating parts, and the ways rocket fuel components transformation in the soil were investigated. The obtained MCMM showed the efficiency of sorption and catalytic decomposition of the rocket fuel transformation products and determined the optimal conditions for remediation. The index of soil detoxification at a concentration of the analyzed decay products is from 0.1 mg/kg to 3.21 mg/kg is from 81.1 to 98.8%. |
| 31 |
The effects of COVID-19-related driving restrictions on air quality in an industrial city
Assanov D., Kerimray A., Batkeyev B., Kapsalyamova Z.
10.4209/aaqr.200663 |
Aerosol and Air Quality Research, Q2 2021 |
To slow the spread of COVID-19, the state of emergency was announced in Kazakhstan on March 16, 2020. Ust-Kamenogorsk instituted COVID-19 lockdown measures on April 2, 2020. The restrictions reduced the flow of traffic in the city but did not have a major impact on the large industries and power plants. In the areas with a complex profile of emission sources, traffic restriction measures alone may hardly tackle serious air pollution. This natural experiment allowed us to test how the reduction in transport movement affects air quality in Ust-Kamenogorsk, as there is a tendency to hold transport as being a major cause of air pollution in Ust-Kamenogorsk. This study analyzes concentrations of four major air pollutants and meteorological parameters in Ust-Kamenogorsk from March 1 to May 15 in 2016-2020. Using the fixed effects model, we find that restrictions have decreased the levels of CO by 21-23 percent, increased the levels of TSP by 13-21 percent, and had no significant effect on SO2 and NO2 concentrations in the city. It implies that heavy pollution in the city with SO2, NO2, TSP are mainly caused by non-transportrelated sources. |
| 32 |
Why energy access is not enough for choosing clean cooking fuels? Evidence from the multinomial logit model
Kapsalyamova Z., Mishra R., Kerimray A., Karymshakov K., Azhgaliyeva D.
10.1016/j.jenvman.2021.112539 |
Journal of Environmental Management, Q1 2021 |
The transition to sustainable energy requires an assessment of drivers of the use of clean and dirty fuels for cooking. Literature highlights the importance of access to clean fuel for switching from dirty fuels to clean fuels. Though access to cleaner fuels, such as electricity promotes clean fuel use, it does not necessarily lead to a complete transition to the use of clean fuels. Households continue using traditional fuels in addition to the clean fuels. The main objective of this paper is to explain the choice of dirty cooking fuels even when access to electricity is provided. We use nationally representative household survey data to study the household energy use decisions in three middle-income countries, namely, India, Kazakhstan, and the Kyrgyz Republic. The study discusses the role of access to natural gas, free fuel, convenience or multi-use of fuels featured by the heating system installed, built-in environment, and other socio-economic factors in household fuel choice for cooking. The results show that access to natural gas increases the likelihood of opting for clean fuel, while the availability of free fuel in rural areas and the coal-based heating system promote the use of solid fuels. |
| 33 |
Rapid quantification and screening of nitrogen-containing rocket fuel transformation products by vortex assisted liquid-liquid microextraction and gas chromatography – high-resolution Orbitrap mass spectrometry
Ul'yanovskii N.V., Kosyakov D.S., Popov M.S., ...Kenessov B., Lebedev A.T.
10.1016/j.microc.2021.106821 |
Microchemical Journal, Q1 2021 |
Existing and newly developed technologies for clean-up of wastewaters and soils contaminated with rocket fuel unsymmetrical dimethylhydrazine (UDMH) are based on the oxidative treatment, as well as gasification in supercritical water. Being easily transformed by a radical mechanism, UDMH is capable of producing an extremely wide range of potentially hazardous nitrogen-containing products. Their identification and simultaneous quantification at low concentrations in water samples by gas chromatography is a challenging task requiring a matrix change. We proposed a combination of dispersive vortex-assisted liquid-liquid microextraction (VALLME) of analytes followed by gas chromatography - Orbitrap mass spectrometry allowing simultaneous target analysis and non-targeted screening. Dichloromethane and chloroform provided rapid (10 min) and effective extraction of most of UDMH transformation products. The maximum recoveries were achieved by alkalizing and saturating the aqueous samples with ammonium sulfate. The use of pyridine-d5 as an internal standard allowed developing an approach to the simultaneous determination of 24 compounds of various classes with detection limits for the most analytes in the range 0.02-1.1 mu g L-1 and accuracy of 81-117% with low-cost, simple, and rapid sample preparation procedure. Extraction with a 100 mu L of chloroform allowed further increasing sensitivity up to one order of magnitude and attaining LOD values for 20 compounds in the range of 0.002-0.1 mu g L-1 comparable with that obtained by vacuum-assisted headspace solid-phase microextraction. The developed method was validated and tested for the analyses of real samples - degraded aqueous solution of rocket fuel, products of UDMH treatment in supercritical water and aqueous extract of soil from the place of carrier rocket accidental crash. Twenty-nine compounds that were not previously described as UDMH transformation products were tentatively identified. |
| 34 |
Biomimetic models of the human eye, and their applications
Regal S., Troughton J., Djenizian T., Ramuz M.
10.1088/1361-6528/abf3ee |
Nanotechnology, Q2 2021 |
Replicating the functionality of the human eye has been a challenge for more than a century, creating a great wealth of biomimetic and bioinspired devices, and providing ever improving models of the eye for myriad research purposes. As improvements in microelectronics have proceeded, individual components of the eye have been replicated, and models of the optical behaviour of the eye have improved. This review explores both work developed for improving medical components, with an ultimate aim of a fully functioning prosthetic eye, and work looking at improving existing devices through biomimetic means. It is hoped that this holistic approach to the subject will aid in the cross pollination of ideas between the two research foci. The review starts by summarising the reported measurements of optical parameters of various components of the eye. It then charts the development of individual bionic components. Particular focus is put on the development of bionic and biomimetic forms of the two main adaptive components of the eye, namely the lens and the iris, and the challenges faced in modelling the light sensitive retina. Work on each of these components is thoroughly reviewed, including an overview of the principles behind the many different approaches used to mimic the functionality, and discussion of the pros and cons of each approach. This is concluded by an overview of several reported models of the complete or semi-complete eye, including details of the components used and a summary of the models' functionality. Finally, some consideration is given to the direction of travel of this field of research, and which existing approaches are likely to bring us closer to the long term goal of a fully functional analogue of the eye. |
| 35 |
TiO2 nanotube layers decorated by titania nanoparticles as anodes for Li-ion microbatteries
Sopha H., Ghigo C., Ng S., ...Djenizian T., Macak J.M.
10.1016/j.matchemphys.2021.125337 |
Materials Chemistry and Physics, Q2 2021 |
In this work, the utilization of TiO2 nanotube (TNT) layers decorated with TiO2 nanoparticles (NPs) as anodes in Li-ion microbatteries is reported for the first time. Such TiO2 NPs decorated TNT layers possess an increased amount of active material and a higher surface area compared with their non-decorated (blank) counterparts. TNT layers decorated with several different amounts of TiO2 NPs were tested by galvanostatic cycling tests. The capacities of the TiO2 NPs decorated TNT layer anodes increase with the amount of NPs decoration due to the enhancement of the capacitive effect. Indeed, an areal capacity of -126 pAh cm(-2) (vs 88 pAh cm(-2) for the non decorated TNT layer) at the 200th cycle has been obtained after optimizing the NPs loading. On the other hand, a too high NPs loading of the TNT layers leads to a reduced areal capacity due to clogging of the nanotube exteriors and a significant decrease in inner diameter of the nanotubes. |
| 36 |
Beyond flexible-Li-ion battery systems for soft electronics
Mukherjee S., Albertengo A., Djenizian T.
10.1016/j.ensm.2021.08.020 |
Energy Storage Materials, Q1 2021 |
Wearable devices, one of the most innovative technological breakthroughs of the consumer electronics sector, promises to develop even more in the near future. Therefore, the research focus has shifted to developing corresponding robust energy storage sources for these devices, the seamless integration of these storage sources and their ability to perform well even under persistent dynamic mechanical stresses. The Li-ion rechargeable battery system has been the gold standard so far for energy storage, owing to its excellent energy and power densities and being an already mature technology. However, Li based devices have drawbacks also: toxicity, flammability, environmental issues, and limited natural abundance tend to offset the said advantages and so alternatives must be studied. It is here that non-Li chemistries, such as Na, K, Ca, Al, Mg, Zn-ion based battery systems can play a leading role due to their earth abundance, advantageous economics and low toxicity. This article, therefore, provides a strong rationale for the implementation of these non-Li systems for energy storage in flexible systems, also giving a brief techno-economic analysis. The manuscript also details the electrode and battery design stateof-the-art, followed by an in-depth review of the notable works for each of these systems, including the type of electrodes used and their novel synthesis procedure, electrochemical performances and other critical aspects regarding their optimization. A brief discussion at the end puts into perspective some of the critical areas needing further improvement. |
| 37 |
Effect of the MoS2 surface layer on the kinetics of intercalation processes in the NaFe(SO4)2/C composite
Kokhmetova S., Kan T., Malchik F., Galeyeva A., Djenizian T., Kurbatov A.
10.1016/j.mtcomm.2021.102723 |
Materials Today Communication, Q2 2021 |
The article deals with the problem of electrochemical conversion of low-conductive materials considering an example of eldfellite-structured NaFe(SO4)(2). The applying process of electronically-conducting material on NaFe (SO4)(2) surface by means of milling providing multiple contacts with the conductive phase and thus delivering electrons to the active material is given a detailed study. The material which has point contact conductivity (Carbon black) is proposed to replace partially by the layer-structured ones (MoS2), thus ensuring full coverage of the active material coating, and, appropriately, wider area of charge delivery to the material's surface. A schematic diagram is proposed of the intercalation process into the active material particles covered with a layer of electron-and ion-conductive additive MoS2. It follows from the scheme that the extreme dependence found experimentally for such electrochemical parameters as the charge/discharge capacity, CV peak current, diffusion coefficient (in solid phase) and half-wave intercalation potential is associated with the thickness of the applied coating. The detected extremum in the dependence of the de/intercalation parameters on the coating thickness is induced by the potential drop during the charge transfer through the coating phase and is confirmed by a quantitative analysis of the process model. |
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38 |
P(DADMAAC-co-DMAA):Synthesis, thermal stability, and kinetics
Akhmetzhan A., Tashenov A., Abeu N., Ospanova Z., Toktarbay Z., Abdiyev K., Nuraje N.
10.1002/pat.4999 |
Polymers for Advanced Technologies, Q2 2021 |
The kinetics of copolymerization is one of the key factors for optimization the process in large scale of production. Copolymerization of N, N-dimethyl-N,N-diallyammonium chloride (DMDAAC) with N,N-dimethyl acrylamide (DMAA) was studied by a dilatometer technique using ammonium persulfate ([NH4](2)S2O8) as an initiator. The effect of the parameters (including molar ratio of DMDAAC to DMAA, concentrations of monomers [M] and initiator [I], and the temperature) on the polymerization rate was analyzed. From these analyses it was found that the polymerization rate (R-p) with the above variables can be represented as the following relationship: R-p proportional to [M](2.63); R-p proportional to [I](0.40)andR(p)proportional to[M-DMDAAC:M-DMAA](-0,86).The negative order found in the relationship of the reaction rate and the monomer composition indicated that the DMDAAC concentration in the monomers composition conversely affected the polymerization rate. The overall activation energy for the polymerization rate was 39.56 kJ/mol in the temperature range between 40 degrees C and 60 degrees C. Based on the experimental results, the mechanism of polymerization is discussed in detail. Different thermal properties for DMDAAC and DMDAAC-DMAA were observed by differential scanning calorimetry (DSC), and thermogravimetry (TG) analysis. Addition of DMAA to DMDAAC lowered the thermal stability relative to the home polymer of DMDAAC. |
| 39 |
Synthesis and heavy‐metal sorption studies of n,n‐dimethylacrylamide‐based hydrogels
Akhmetzhan A., Abeu, N., Longinos S.N., ...Ospanova Z., Toktarbay Z.
10.3390/polym13183084 |
Polymers, Q1 2021 |
In this work, a hydrogel system was produced via radical polymerization of N,N-dimethylacrylamide and 2-acrylamido-2-methylpropanesulfonic acid in the presence of N,N-methylene-bis-acrylamide as a crosslinker and ammonium persulfate as an initiator. Parameters that impact the conversion of copolymerization (such as initial concentration of monomers, temperature, initiator dose, and time) were studied. The swelling degree of the hydrogel was investigated with the addition of a crosslinker and initiator at different pH levels. A hydrogel with high conversion and high swelling degree was selected to investigate their ability for adsorption of Pb(II) ions from solutions. Adsorption behavior of Pb(II) ions in a hydrogel was examined as a function of reaction time and concentration of lead ions from a solution of Pb(II) ions. |
| 40 |
Microwave absorbing properties of ferrites and their composites: A review
Houbi A., Aldashevich Z.A., Atassi Y., ...Bagasharova Z., Myrzakieva S., Kubanych K.
10.1016/j.jmmm.2021.167839 |
Journal of Magnetism and Magnetic Materials, Q2 2021 |
Recently, with the quick evolution of electronic technologies, and the development of telecommunication, high-performance microwave absorbing composites in which ferrite is one of their components have attracted a lot of attention. These composites should have high absorption intensity, a wide absorption bandwidth, a thin thickness, and finally light weightiness. These composites often exhibit efficiency to fulfill coveted magnetic and dielectric characteristics. This review provides a brief presentation of ferrites and among them are spinel ferrites and hexagonal ferrites. In addition to that, it discusses the classifications of ferrites according to magnetic properties, the synthesis methods to prepare nano ferrites, and control their properties. Also, it presents the main mechanism to absorb the microwaves (e.g. dielectric and magnetic losses) and finally discusses the microwave absorbing characteristics of ferrites and their composites in terms of matching frequency, reflection loss (RL) values, and absorption bandwidth. |
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41 |
Dairy associations for the targeted control of opportunistic Candida
Aitzhanova A., Oleinikova Y., Mounier J., ...Alimzhanova M., Ashimuly K., Sadanov A.
10.1007/s11274-021-03096-1 |
World Journal of Microbiology and Biotechnology, Q2 2021 |
Antifungal and antibacterial activities of twenty-six combinations of lactic acid bacteria, propionibacteria, acetic acid bacteria and dairy yeasts inoculated in whey and milk were investigated. Associations including acetic acid bacteria were shown to suppress growth of the opportunistic yeast Candida albicans in well-diffusion assays. The protective effect of milk fermented with the two most promising consortia was confirmed in Caco-2 cell culture infected with C. albicans. Indeed, these fermented milks, after heat-treatment or not, suppressed lactate dehydrogenase release after 48 h while significant increase in LDH release was observed in the positive control (C. albicans alone) and with fermented milk obtained using commercial yogurt starter cultures. The analysis of volatile compounds in the cell-free supernatant using solid phase microextraction (SPME) coupled to gas chromatography-mass spectrometry (GC-MS) showed accumulation of significant amount of acetic acid by the consortium composed of Lactobacillus delbrueckii 5, Lactobacillus gallinarum 1, Lentilactobacillus parabuchneri 3, Lacticaseibacillus paracasei 33-4, Acetobacter syzygii 2 and Kluyveromyces marxianus 19, which corresponded to the zone of partial inhibition of C. albicans growth during well-diffusion assays. Interestingly, another part of anti-Candida activity, yielding small and transparent inhibition zones, was linked with the consortium cell fraction. This study showed a correlation between anti-Candida activity and the presence of acetic acid bacteria in dairy associations as well as a significant effect of two dairy associations against C. albicans in a Caco-2 cell model. These two associations may be promising consortia for developing functional dairy products with antagonistic action against candidiasis agents. |
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42 |
Generation of hydrogen and oxygen from water by solar energy conversion
Shapovalov Y., Tokpayev R., Khavaza T., Nauryzbayev M.
10.3390/su132413941 |
Sustainability, Q2 2021 |
Photosynthesis is considered to be one of the promising areas of cheap and environmentally friendly energy. Photosynthesis involves the process of water oxidation with the formation of molecular oxygen and hydrogen as byproducts. The aim of the present article is to review the energy (light) phase of photosynthesis based on the published X-ray studies of photosystems I and II (PS-I and PS-II). Using modern ideas about semiconductors and biological semiconductor structures, the mechanisms of H+, O-2 up arrow, e(-) generation from water are described. At the initial stage, PS II produces hydrogen peroxide from water as a result of the photoenzymatic reaction, which is oxidized in the active center of PS-II on the Mn4CaO5 cluster to form O-2 up arrow, H+, e(-). Mn4+ is reduced to Mn2+ and then oxidized to Mn4+ with the transfer of reducing the equivalents of PS-I. The electrons formed are transported to PS-I (P 700), where the electrochemical reaction of water decomposition takes place in a two-electrode electrolysis system with the formation of gaseous oxygen and hydrogen. The proposed functioning mechanisms of PS-I and PS-II can be used in the development of environmentally friendly technologies for the production of molecular hydrogen. |
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43 |
Assessing air quality changes in large cities during COVID-19 lockdowns: The impacts of traffic-free urban conditions in Almaty, Kazakhstan
Kerimray A., Baimatova N., Ibragimova O.P., Bukenov B., Kenessov B., Plotitsyn P., Karaca F.
10.1016/j.scitotenv.2020.139179 |
Science of the Total Environment, Q1 2020 |
Number of cities worlwide experienced air quality improvements during COVID-19 lockdowns; however, such changes may have been different in places with major contributions from nontraffic related sources. In Almaty, a city-scale quarantine came into force on March 19, 2020, which was a week after the first COVID-19 case was registered in Kazakhstan. This study aims to analyze the effect of the lockdown from March 19 to April 14, 2020 (27 days), on the concentrations of air pollutants in Almaty. Daily concentrations of PM2.5, NO2, SO2, CO, O-3, and BTEX were compared between the periods before and during the lockdown. During the lockdown, the PM2.5 concentration was reduced by 21% with spatial variations of 6-34% compared to the average on the same days in 2018-2019, and still, it exceeded WHO daily limit values for 18 days. There were also substantial reductions in CO and NO2 concentrations by 49% and 35%, respectively, but an increase in O-3 levels by 15% compared to the prior 17 days before the lockdown. The concentrations of benzene and toluene were 2-3 times higher than those during in the same seasons of 2015-2019. The temporal reductions may not be directly attributed to the lockdown due to favorable meteorological variations during the period, but the spatial effects of the quarantine on the pollution levels are evidenced. The results demonstrate the impact of traffic on the complex nature of air pollution in Almaty, which is substantially contributed by various nontraffic related sources, mainly coal-fired combined heat and power plants and household heating systems, as well as possible small irregular sources such as garbage burning and bathhouses. |
| 44 |
Study of polarization characteristics of corrosion films on magnesium in sulfate-containing electrolytes
Abildina A.K., Argimbayeva A.M., Kurbatov A., Bakhytzhan Y., Rakhymbay G., Wark M., Bottke P.
10.3390/app10041406 |
Applied Sciences (Switzerland), Q2 2020 |
In this article, the results of studying the polarization characteristics of magnesium covered with corrosion film in aqueous solutions of MgSO4 and Na2SO4 are presented. The absence of a corrosion-free magnesium surface was shown; in this connection, it was proposed to interpret the larger values of Tafel's coefficients obtained in the experiment from the point of view of limiting the electrochemical process by charge transfer in the film phase. Charge transfer in corrosion films obeys the regularities of particle movement in high electric fields, and it is not only cationic. According to the impedance measurements, the resistance of the oxide and hydroxide layer of the magnesium-based corrosion film in the studied solutions was calculated. The largest contribution to the restriction of charge transfer in the initial stages of corrosion is made by a dense primary film defining the polarization resistance. Correlation of transfer parameters in high electric fields with thickness and resistance of corrosion film was demonstrated. |
| 45 |
Interaction of metal ions with humic acids of brown coals of Kazakhstan
Dauletbay A., Serikbayev B.A., Kamysbayev D.K., Kudreeva L.K.
10.1080/17458080.2020.1810240 |
Journal of Experimental Nanoscience, Q2 2020 |
This paper investigates interaction processes of the Fe3+, Cu2+, Ni2+, and Co(2+)cations with humic acids isolated from brown coals of Ekibastuz basin. It was demonstrated that the sorption of heavy metal ions by humic acids (HA) depends on the concentration and nature of cations and decreases in the order of Fe3+> Cu2+> Ni2+> Co2+; while increase in the concentration of humic acids (HA) results in the higher yield of ions and metals. The occurrence of ion exchange and complexation reactions in metal-humic acid systems is confirmed by the appearance of new bands and the shift of the absorption bands corresponding to stretching and deformation vibrations of carboxylate ions, C = O and OH groups. The occurrence of these processes is also evidenced by spectrophotometric data, as well as a decrease in the pH of the solution due to deprotonation of humic acids during these reactions. Thus, based on the data on the degree of sorption of metal cations by humic acids, the results of infra-red spectroscopy and spectrophotometry, it can be concluded that the Fe3+, Ni2+, Co2+, Cu(2+)cations interact with HA by the ionic mechanism and by the complexation mechanism with electron-donating functional groups. Electrochemical studies of the Cu2+- humic acid system carried out by the method of cyclic voltammetry also indicate the occurrence of the interaction of humic acid with copper cations. Modification of humic acid with copper ions shows the electrochemical activity of copper immobilized on the surface of dispersed humic acid, which is important for the implementation of electrocatalytic reactions on modified glassy carbon-humic electrodes. |
| 46 |
Synthesis, structure and electrochemical performance of Eldfellite, NaFe(SO4)2, doped with SeO4, HPO4 and PO3F
Trussov I.A., Kokhmetova S.T., Driscoll L.L., Smith R., Berry F.J., Marco J.F., Galeyeva A.K., Kurbatov A.P., Slater P.R.
10.1016/j.jssc.2020.121395 |
Journal of Solid State Chemistry, Q2 2020 |
NaFe(SO4)(2) materials partially substituted with SeO4(2-), HPO42- and PO3F2- were prepared and investigated as possible cathode materials for sodium-ion batteries. Neutron diffraction and Raman spectroscopy studies confirmed the successful incorporation of SeO4(2-) and HPO(4)(2- )while the Raman studies suggested that significant hydrolysis of PO3F2- had occurred during the synthesis. The effective diffusion coefficients were determined from conductivity and electrochemical kinetics studies, showing low Na ion diffusion. Galvanostatic and cyclic voltammetry investigations demonstrated more significant degradation and a narrowing of the electrochemical stability window for the doped materials, which was most significant for the SeO4 and HPO4 doped samples. Therefore, while doped NaFe(SO4)(2) were successfully prepared, the best electrochemical performance was shown for the undoped system. |
| 47 |
Spatiotemporal variations and contributing factors of air pollutants in almaty, Kazakhstan
Kerimray A., Azbanbayev E., Kenessov B., Plotitsyn P., Alimbayeva D., Karaca F.
10.4209/aaqr.2019.09.0464 |
|
In this study, spatial and temporal patterns of PM10, PM2.5, NO2, SO2, and CO in Almaty, the largest city of Kazakhstan, in the period between 2013 and 2018 are explored. Severe degradation of air quality was observed from the data that were used in this study. Annual averages of PM2.5, PM10, and NO2 concentrations exceeded the WHO annual limits by 5.3, 3.9, and 3.2 times, respectively. The maximum levels were observed in the winter, while the minimum levels in the summer. Winter-to-summer difference was more noticeable for PM2.5 than for other pollutants. The winter pollution peaks demonstrate the high contribution of large- and small-scale coal combustion for heating, which could be exacerbated with lower winds and possible more frequent thermal inversions. There was a negative correlation between elevation and levels of SO2, PM2.5, and PM10, while no correlation was observed for NO2 and CO, indicating that the former group could be mainly contributed by point sources located predominantly at lower elevations (e.g., power plants) and the latter group mainly originated from nonpoint sources distributed evenly across the city (e.g., transport). Urgent measures are needed to reduce emissions from the coal-fired power plant and from the domestic heating stoves. |
| 48 |
Polymeric ionic liquid sorbent coatings in headspace solid-phase microextraction: A green sample preparation technique for the determination of pesticides in soil
Orazbayeva D., Koziel J.A., Trujillo-Rodríguez M.J., Anderson J.L., Kenessov, B.
10.1016/j.microc.2020.104996 |
Microchemical Journal, Q1 2020 |
In this work, a green approach utilizing novel polymeric ionic liquid (PIL) coatings for headspace solid-phase microextraction (HS-SPME) of four current-use pesticides from soil samples was studied for the first time. Epoxiconazole, fluroxypyr, metribuzin, and oxyfluorfen were the target pesticides. Three PIL coatings containing 1-vinylbenzyl-3-hexadecylimidazolium bisKtrifluoromethypsulfonyllimide (PIL1 and PIL2) and 1-vinyl-3-(10-hydroxydecyl)imidazolium bis[(trifluoromethyl)sulfonyl]imide (PIL3) monomers, and 1,12-di(3-vinylbenzylimidazolium)dodecane bis[(trifluoromethyl)sulfonyl]imide (PIL1) and 1,12-di(3-vinylbenzimidazolium)dodecane bis[(trifluoromethyl)sulfonyl]imide (PIL2 and PIL3) crosslinkers were employed in this study. The performance of these PIL coatings was evaluated and compared with commercial SPME coatings based on polydimethylsiloxane/divinylbenzene (PDMS/DVB) and polydimethylsiloxane (PDMS) at the different extraction temperatures (50-90 degrees C) and sampling times (15-60 min). HS-SPME at 90 degrees C for 60 min provided the highest sensitivity and adequate reproducibility for the majority of analytes. Despite having a lower thickness, PIL2 and PIL3 coatings provided similar extraction effectiveness of analytes, and 24-247% higher coating volume-normalized responses compared to the commercial PDMS/DVB coating. The use of the PIL1 sorbent coating resulted in excellent linearity (R-2 = 0.995-0.999) and lower detection limits (0.06-0.4 ng g(-1)) for all analytes. The optimized method provides acceptable recoveries of spiked concentrations with better performance (84-112%) achieved with the PIL1 coating. Compared to other known methods for target pesticides in soil, the proposed method provides the highest compliance with the principles of green analytical chemistry evaluated using Analytical Eco-Scale and Green Analytical Procedure Index tools. |
| 49 |
High performance stretchable Li-ion microbattery
Nasreldin M., Delattre R., Calmes C., ...Tocnaye J.-L.D.B.D.L., Djenizian T.
10.1016/j.ensm.2020.07.005 |
Energy Storage Materials, Q1 2020 |
The recent advances in wearable technologies had caused a surge in the demand for stretchable Li-ion micro-batteries. Herein, a special design based on micropillar electrodes supported on metallic serpentines has been investigated to achieve the fabrication of a functionning device. Besides achieving high areal capacity values like 2.5 mA h cm(-2) at C/10 (i.e. 0.07 mA cm(-2)), the micropillars make the system reversibly stretchable. Electro-chemical tests revealed excellent performance when the stretchable micropower source was subjected to different mechanical strains. Indeed, 73% of the capacity is retained over 100 cycles under 30% strain and all fatigue tests showed that capacity retention remain higher than 70%. |
| 50 |
Changes in temperature inside an optomechanical model of the human eye during emulated transscleral cyclophotocoagulation
Regal S., Troughton J., Delattre R., Djenizian T., Ramuz M.
10.1364/BOE.385016 |
Biomedical Optics Express, Q1 2020 |
Currently, many diseases of the eye are treated by laser surgery. An understanding of light propagation and the heating of eye tissue during laser exposure is crucial to improving the outcome of these procedures. Here, we present the development of physical and computational models of the human eye by combining optical light propagation and thermal characteristics. For the physical model, all parts of the eye, including cornea, lens, ciliary body, sclera, aqueous and vitreous humors, and iris, were fabricated using a 3D printed holder and modified polydimethylsiloxane. We also present a computational model based on finite element analysis that allows for a direct comparison between the simulation and experimental measurements. These models provide an opportunity to directly assess the rise in temperature in all eye tissues. The simulated and physical models showed good agreement for the transmission of light at varying incident angles. The heating of optical components was investigated in the retina and the ciliary body during simulated laser surgery. Temperature increases of 45.3 degrees C and 30.6 degrees C in the retina and ciliary bodies, respectively, were found in the physical model after 1 minute of exposure to 186 mW of 850 nm laser radiation. This compared to 29.8 degrees C and 33.9 degrees C increases seen under the same conditions in the simulation model with human eye parameters and 48.1 degrees C and 28.7 degrees C for physical model parameters. These results and these models are very promising for further investigation of the impact of laser surgery. |
| 51 |
All-solid-state lithium ion batteries using self-organized TiO2 nanotubes grown from Ti-6Al-4V alloy
Sugiawati V.A., Vacandio F., Djenizian T.
10.3390/molecules25092121 |
Molecules, Q2 2020 |
All-solid-state batteries were fabricated by assembling a layer of self-organized TiO2 nanotubes grown on as anode, a thin-film of polymer as an electrolyte and separator, and a layer of composite LiFePO4 as a cathode. The synthesis of self-organized TiO2 NTs from Ti-6Al-4V alloy was carried out via one-step electrochemical anodization in a fluoride ethylene glycol containing electrolytes. The electrodeposition of the polymer electrolyte onto anatase TiO2 NTs was performed by cyclic voltammetry. The anodized Ti-6Al-4V alloys were characterized by scanning electron microscopy and X-ray diffraction. The electrochemical properties of the anodized Ti-6Al-4V alloys were investigated by cyclic voltammetry and chronopotentiometry techniques. The full-cell shows a high first-cycle Coulombic efficiency of 96.8% with a capacity retention of 97.4% after 50 cycles and delivers a stable discharge capacity of 63 mu Ah cm(-2) mu m(-1) (119 mAh g(-1)) at a kinetic rate of C/10. |
| 52 |
TiO2 nanotube layers decorated with Al2O3/MoS2/Al2O3 as anode for li-ion microbatteries with enhanced cycling stability
Tesfaye A.T., Sopha H., Ayobi A., ...Macak J.M., Djenizian T.
10.3390/nano10050953 |
Nanomaterials, Q1 2020 |
TiO2 nanotube layers (TNTs) decorated with Al2O3/MoS2/Al2O3 are investigated as a negative electrode for 3D Li-ion microbatteries. Homogenous nanosheets decoration of MoS2, sandwiched between Al2O3 coatings within self-supporting TNTs was carried out using atomic layer deposition (ALD) process. The structure, morphology, and electrochemical performance of the Al2O3/MoS2/Al2O3-decorated TNTs were studied using scanning transmission electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and chronopotentiometry. Al2O3/MoS2/Al2O3-decorated TNTs deliver an areal capacity almost three times higher than that obtained for MoS2-decorated TNTs and as-prepared TNTs after 100 cycles at 1C. Moreover, stable and high discharge capacity (414 mu Ah cm(-2)) has been obtained after 200 cycles even at very fast kinetics (3C). |
| 53 |
Editorial: Advances in Porous Semiconductor Research
Djenizian T., Voelcker N.H.
10.3389/fchem.2020.00122 |
Frontiers in Chemistry, Q2 2020 |
- |
| 54 |
Direct pre-lithiation of electropolymerized carbon nanotubes for enhanced cycling performance of flexible li-ion micro-batteries
Sugiawati V.A., Vacandio F., Yitzhack N., Ein-Eli Y., Djenizian T.
10.3390/polym12020406 |
Polymers, Q1 2020 |
Carbon nanotubes (CNT) are used as anodes for flexible Li-ion micro-batteries. However, one of the major challenges in the growth of flexible micro-batteries with CNT as the anode is their immense capacity loss and a very low initial coulombic efficiency. In this study, we report the use of a facile direct pre-lithiation to suppress high irreversible capacity of the CNT electrodes in the first cycles. Pre-lithiated polymer-coated CNT anodes displayed good rate capabilities, studied up to 30 C and delivered high capacities of 850 mAh g(-1) (313 mu Ah cm(-2)) at 1 C rate over 50 charge-discharge cycles. |
| 55 |
Flexible and Stretchable Microbatteries for Wearable Technologies
Nasreldin M., de Mulatier S., Delattre R., Ramuz M., Djenizian T.
10.1002/admt.202000412 |
Advanced Materials Technologies, Q1 2020 |
Soft microbatteries should rapidly emerge on the world market owing to the spectacular rise of wearable technologies that are needed to be powered. The field of applications is actually very large as the main sectors that will be impacted include Internet-of-things, printed electronics, e-textile, medical devices, smart cards, horizontal ellipsis These specific micropower sources have to show high electrochemical performance and sustain various mechanical strains. They also have to fulfill harsh criteria in terms of size and fabrication processes to ensure their integration in functional devices. In this report, achievements on structural design, fabrication strategies, and performances of flexible and stretchable microbatteries are reviewed. The different strategies proposed to improve electrochemical and mechanical properties: creation of new designs, investigation of alternative microstructuring techniques, involvement of new nanomaterials, etc., are highlighted. The future prospects of these recent technologies are also discussed. |
| 56 |
Study on the influence of emulsification property of functional polymers on enhanced oil recovery and its mechanism
Kang W., Sarsenbekuly B., Turtabayev S., Aidarova S., Gabdullin M., Ospanova Z., Issakhov M.
10.1016/j.petrol.2019.106627 |
Journal of Petroleum Science and Engineering, Q1 2020 |
Functional polymer flooding has been proven to be capable to improve oil recovery by mobility control and emulsification. However, the contribution degree of emulsification function of polymer flooding to oil recovery has not been clarified. This work experimentally investigated the ability of two functional polymers (RH-4 and KLP-6) with emulsification property and common polymer (HPAM) to enhance oil recovery. The steady shear viscosity, viscoelasticity and emulsification property of polymers were measured by rheometer and bottle tests, respectively. The core displacement experiments and etched glass micro-model were conducted to measure the oil recovery and the mechanism. The results showed that under the same viscosity of the three polymers, RH-4 and KLP-6 with emulsification property exhibited higher improvement of oil recovery over the emulsification-free HPAM polymer due to their higher washing efficiency. And in heterogeneous formation, the KLP-6 polymer obtained the highest recovery which can be attributed to the higher sweep volume by Jamin effect of the emulsified oil droplets. This work establishes a theoretical foundation for the application of functional polymers in oil fields. |