ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Xin Ao,Zhaoyin Wen,Xiangwei Wu,Tian Wu,Meifen Wu
The role of the Ni3S2 layer on Ni particles in the electrochemical performance of Na/NiCl2 cells with the addition of sulfur into the cathode is studied. It was found that the Ni3S2 layer could be in situ generated on nickel particles and exhibit a self-repairing function during cycling when sulfur exists in the cathode due to the reaction between the sulfur and nickel particles. The self-repairing function of the Ni3S2 layer could enhance the blocking effect and improve the battery cycle performance. The capacity of the cell with the optimum amount of sulfur (with self-repairing function) after 50 cycles is about 12% greater than that of the cell with the optimum level of Ni3S2 (without self-repairing function). The effect of the self-repairing function of the Ni3S2 layer is determined by the amount of sulfur in the cathode.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 14
·21267-21278
·
IF 0
Zhao Dongling,Geng Linlin,Jia Yanfei,Wei Jianwen,Zhou Xiaobin,Liao Lei
High-temperature solid adsorbent Li 4 SiO 4 has received broad attention due to its high theoretical adsorption capacity, high regeneration capacity, and wide range of raw materials for preparation. In this paper, a Li 4 SiO 4 adsorbent was prepared by MCM-48 as the silica precursor and modified by doping with metal ions (Ca 2+ and Na + ) for high-temperature capture of low-concentration CO 2 . The results showed that the surface of the Ca-doped (or Na-doped) Li 4 SiO 4 adsorbent developed some particles that are primarily composed by Li 2 CaSiO 4 (or Li 3 NaSiO 4 ). Furthermore, the grains of the adsorbents became finer, effectively increasing the specific surface area and enhancing adsorption performance. Under 15 vol% CO 2 , the maximum CO 2 adsorption was 25.63 wt% and 32.86 wt% when the Ca 2+ doping amount was 0.06 and the Na + doping amount was 0.12, respectively. These values were both higher than the adsorption capacity before the metal ion doping. After 10 adsorption/desorption cycles, the adsorption capacity of Na-doped Li 4 SiO 4 increased by 9.68 wt%, while that of Ca-doped Li 4 SiO 4 decreased by 7.98 wt%. This difference could be attributed to the easy sintering of the Ca-containing adsorbent. Furthermore, a biexponential model was used to fit the CO 2 adsorption curve of the adsorbent in order to study the adsorption kinetics. Compared to the conventional Li 4 SiO 4 , the Ca/Na-doped adsorbent offers several advantages, such as a high CO 2 adsorption capacity and stable cycling ability.
研究领域:
材料科学
·
环境工程
·
化学工程
·
吸附技术
✓ 已验证
DOI
INTEGRATED FERROELECTRICS
·
2015
·
IF 0.357
Yu Guo Zhuo,Jun Liu,Qing Shan Li,Guang Zhong Xing,Wen Feng Lv
Na-CMC polyurethane microspheres were prepared with isophorone diisocyanate and polyethylene glycol and sodium carboxymethyl cellulose as main materials. Ibuprofen used as a model drug and core material was coated into microspheres. The microspheres morphologies and the composite physical states were investigated using optical microscopy, scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) spectroscopy. Optical microscopy and scanning electron microscopy observations revealed that had a good spherical structure. Results from FTIR and DSC suggested that the Na-CMC had been successfully introduced to the polyurethane molecular chain, Na-CMC polyurethane microspheres had good thermal stability, and heating weightlessness was less than 2% in the 300°C. Na-CMC polyurethane microspheres carried drug were pH sensive and the drug release rate under different pH value were different.
研究领域:
药学
·
材料科学
·
药物递送系统
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2024
·
IF 9.7
Zhengshuai Sun,Rujiao Jiang,Wenbin Hua,Qi Wei,Qiaoxia Yuan,Baojun Yi
Biomass-based graphitic carbon is a promising material, but the effect mechanism of inherent alkali metals on the catalytic pyrolysis of biomass is still unclear. In this study, cellulose was selected as the model substance, and the influence mechanism of Na on the graphitization of cellulose catalytic pyrolysis was investigated through a combination of experiments and theoretical calculations. The results indicate that Na can interact with the carbon skeleton through van der Waals forces, thereby altering the spatial structure of graphite crystals and increasing the interlayer spacing of graphite by 27.7%. In addition, Na can coexist with Fe(III) in the form of oxides, while also increasing the reaction energy barrier of reverse hydroxylation and dehydration cyclization, decreasing the generation of reducing gases mainly composed of CO. This impedes the reduction of iron-based catalysts, thereby affecting the formation of the graphite microcrystalline structure. The research indicates that maintaining the ratio of Na content to iron-based catalysts within a 1:1 range is optimal for producing graphite carbon from cellulose.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2017
·Vol. 33
·期 3
·378-383
·
IF 1.024
Liang Guangping,Chung Tseyu,Guo Jinhua,Zhang Rongrong,Xü Wei,Tzen Jason T. C.,Jiang Renwang
Some cinobufagin oxime ether derivatives as potential Na + /K + -ATPase inhibitors were synthesized by following the side chain of istaroxime. These compounds inhibit Na + /K + -ATPase in a dose-dependent manner. Compound 3 c with an oxyethylamine side chain that is the same as that of istaroxime showed the most potent inhibition, which was stronger than compound 3 a with only hydroxyoxime moiety at C-3 and compound 3 b with a methylated hydroxyoxime moiety. Molecular docking was used to explore the binding modes of the target compounds with Na + /K + -ATPase, which suggested that the longer ethyl amine group at C-3 oxime moiety of compound 3 c could make stronger interaction with Na + /K + -ATPase via intermolecular charge-charge and H-bond interaction as compared with other derivatives.
研究领域:
药理学
·
有机化学
·
计算生物学
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2022
·
IF 3.662
Yanfei Jia,Jianwen Wei,Yuan Yuan,Xiaobin zhou,Linlin Geng,Lei Liao
Using KIT-6 as the silica source, a series of Li 4 SiO 4 adsorbents (KIT-6-Li 4 SiO 4 ) were synthesized by impregnation precipitation method for high temperature CO 2 capture. Then, the KIT-6-Li 4 SiO 4 -800–4 (KL-800–4) material, was selected to analyze the improvement of the adsorption performance by Ca 2+ /Na + eutectic doping modification. These adsorbents were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and low temperature N 2 adsorption/desorption, and the CO 2 adsorption capacity of them was explored. At 600 °C and under 15 vol% CO 2 , KL-Ca0.03 and KL-Na0.06 sorbents resulted in a CO 2 uptake of 29.17 wt% and 35.35 wt% (close to the theoretical maximum), respectively，which are much higher than that of KL-800–4 (14.73 wt%). After 10 adsorption/desorption cycles, the adsorption capacity of KL-Na0.06 increased by 1.35 wt%. We found that KL-Na0.06 has more advantages compared with traditional lithium orthosilicate and undoped adsorbents, including lower energy consumption, higher CO 2 adsorption capacity and better cycling ability. Finally, the double exponential model had a high degree of fit for the adsorption of CO 2 by Li 4 SiO 4 .
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Licheng Zhang,Jinfeng Li,Ruirui Liu,Yongquan Zhou,Yuze Zhang,Lianmin Ji,Lijuan Li
Efficient separation of lithium from salt lake brine with high Na/Li ratio is of great importance for the development of new energy industry. Liquid-liquid extraction using β-diketone system was proved to be an effective approach to separate lithium from alkaline metal ions, while the separation effect of lithium to alkali earth ions needs further investigation. In this work we proposed an extraction process using HBTA/TRPO system to recovery lithium from salt lake brine with high Na/Li ratio. The conditions of saponification, extraction, eluting, stripping and regeneration process was optimized by equilibrium experiments. Through the process, lithium, calcium and magnesium were extracted to the organic phase and then stripped step by step to obtain lithium-rich solution, then the stability of the process and organic was tested by cycle experiments, the results indicated the proposed method was effective and stable. Theoretical study based on density functional theory was conducted to expound the extraction selectivity to different metal ions, and the energy change, electrostatic potential and Mulliken charge of the complexes was obtained, the calculated results suggested the stability of the complexes followed the sequence: Mg 2+ > Ca 2+ > Li + > Na + > K + , which is consistent with the experimental results. The present work may provide a novel way to efficiently recover lithium from salt lake brine with high Na/Li ratio.
研究领域:
化学工程
·
新能源材料
·
理论计算
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Liyi Zhang,Yongcong Liu,Guangyong Zeng,Zhaomei Yang,Qingquan Lin,Yanyong Wang,Xiaoguang Wang,Shengyan Pu
MXene-based two-dimensional (2D) material membranes have attracted an increasing number of attentions in the field of separation and purification. However, the easily oil-pollution of MXene membrane still limit its further application for oil/water separation. In this work, Na-Bentonite was embedded into MXene nanosheets and then a series of Na-Bentonite@MXene (NBM) composite membranes were prepared by one-step hydrothermal pretreatment and vacuum self-assembly on polyvinylidene fluoride membrane surface. The modified composite membranes exhibited excellent separation performances with a rejection ratio above 96 % and a flux recovery rate (FRR) higher than 86 % after 8 cycling tests for oil/water emulsion. In addition, the sandwich structure consisting of MXene nanosheets and Na-Bentonite could not only play a positive role in the stability of composite membrane, but also formed a special micro-nano structure on membrane surface, resulting in a switchable wettability of composite membrane. When the membrane surface was pretreated with water or oil, it presented hydrophilic/hydrophobic or hydrophobic/oleophilic surfaces, respectively, which realized the effective separation for different components in oil/water emulsion. This work provides a new method for the design and construction of MXene-based 2D membrane with continuous anti-fouling capacity, which shows a great application potential in the treatment of oily wastewater.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Yifan Chen,Wentao Yuan,Yingxin Zhang,Hu-jun Qian,Zhong-yuan Lu,Shuxun Cui
According to the principle of polymer science, the gelation process of κ-carrageenan should start with polymer chains in a disordered coil conformation. However, the coil-helix model has been challenged by recent studies, which pointed out that in deionized water, κ-carrageenan exists in single-helix conformation rather than random coil. Here, we employ single-molecule force spectroscopy (SMFS) to investigate its conformation under different conditions at the single-chain level. Direct evidence for the existence of random coil state is obtained. In addition, it is found that coil-single helix transition can be induced by external Na + ions, which can screen the charges of the sulfated groups in κ-carrageenan. Thus, the mechanism of the first step of κ-carrageenan gelation is revealed, which lays a solid foundation for better understanding of the entire gelation process.
研究领域:
高分子科学
·
生物物理学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 9
·2332
·
IF 5.076
Qiangqiang Feng,Yanyan Liu,Jitong Yan,Wei Feng,Shaozheng Ji,Yongfu Tang
A promising aqueous aluminum ion battery (AIB) was assembled using a novel layered K2Ti8O17anode against an activated carbon coated on a Ti mesh cathode in an AlCl3-based aqueous electrolyte. The intercalation/deintercalation mechanism endowed the layered K2Ti8O17as a promising anode for rechargeable aqueous AIBs. NaAc was introduced into the AlCl3aqueous electrolyte to enhance the cycling stability of the assembled aqueous AIB. The as-designed AIB displayed a high discharge voltage near 1.6 V, and a discharge capacity of up to 189.6 mAh g−1. The assembled AIB lit up a commercial light-emitting diode (LED) lasting more than one hour. Inductively coupled plasma–optical emission spectroscopy (ICP-OES), high-resolution transmission electron microscopy (HRTEM), and X-ray absorption near-edge spectroscopy (XANES) were employed to investigate the intercalation/deintercalation mechanism of Na+/Al3+ions in the aqueous AIB. The results indicated that the layered structure facilitated the intercalation/deintercalation of Na+/Al3+ions, thus providing a high-rate performance of the K2Ti8O17anode. The diffusion-controlled electrochemical characteristics and the reduction of Ti4+species during the discharge process illustrated the intercalation/deintercalation mechanism of the K2Ti8O17anode. This study provides not only insight into the charge–discharge mechanism of the K2Ti8O17anode but also a novel strategy to design rechargeable aqueous AIBs.Keywords:aluminum ion battery;K2Ti8O17anode;discharge–charge mechanism
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Lin Li,Jiawei Zhao,Shaohua Luo,Pengyue Xing,Xinglong Teng,Zhenzhu Cao,Guorong Li
Materials with colossal permittivity (CP) have been extensively investigated for their promising applications in energy storage devices. In this work, the composition, microstructure and dielectric properties of (Na 0.25 Ta 0.75 ) x Ti 1–x O 2 (x = 0–0.04) ceramics were systematically investigated. Co-doped TiO 2 ceramics demonstrated giant dielectric constants. The optimized dielectric properties were achieved in (Na 0.25 Ta 0.75 ) 0.02 Ti 0.98 O 2 with high dielectric constant (7.32 × 10 4 ) and low loss (0.034) at 1 kHz. The origin of CP was explored by dielectric, complex impedance spectroscopy and X-ray photoelectron spectroscopy measurements. The giant dielectric constant primarily stems from the electronic pinning defect dipole effect and the internal barrier layer capacitance effect. This finding might shed light on the design of high-performance giant dielectric materials.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·Vol. 37
·期 21
·2501131
·
IF 26.8
Jianfeng Yan,Jiajia Tan,Quanhua Lin,Zhihao Zhang,Ziang Liu,Qiang Fu,Lei Yuan,Qi Zhang,Xu Feng,Shifeng Zhou
LiNbO 3 nanocrystal-glass composites (LiNbO 3 -NGC), characterized by its unique 3D random domain structure, have shown great promise for significant applications, such as femtosecond pulse monitoring and full-color 3D displays. However, the nonlinear response of the LiNbO 3 -NGC is greatly suppressed by the defects, and effective manipulation of these defects remains a long-standing challenge. In this study, a Na-hybridization strategy is proposed to control defects in the LiNbO 3 -NGC to enhance its nonlinear properties and realizing its practical application for ultrashort optical pulse monitoring. The findings reveal that the incorporation of Na ions effectively reduces the defects within the composite, resulting in significantly improved nonlinear effects. By using this hybridized LiNbO 3 -NGC, the transverse second-harmonic generation is achieved. An ultrashort optical pulse system is also constructed and successfully applied it for real-time quantitative measurement of the duration, distribution, and front tilting of optical pulses in the 10 −15 s scale. These results not only present an excellent example about defect engineering in nonlinear LiNbO 3 -NGC but also point to practical applications for the measurement of extreme physical parameters.
研究领域:
材料科学
·
光学工程
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）