摘要：
In recent years, ternary nickel-rich layered oxides have gradually replaced traditional binary cathode materials in the lithium-ion battery market due to their advantages of high energy density and environmental protection. However, their structural instability of cathode materials has seriously affected the cycle performance of the battery. In order to optimize the internal structure of LiNi0.5Co0.2Mn0.3O2, the first-principle calculation was carried out in advance. The energy band density, state density and volume changes were obtained by the simulation calculation. Meanwhile, the electrochemical performance of modified LiNi0.5Co0.2Mn0.3O2 prepared by in-situ doping Na and Cl by wet grinding solid phase method was investigated. The results show that the impedance, capacity and capacity retention data are very compatible with the simulation results. The modified sample exhibits a good cyclic stability with the capacity retention of 80.91% after 80 cycles at 1 C, which is higher than that of 70.00% for commercial LiNi0.5Co0.2Mn0.3O2. The scanning electron microscope characterization indicates that the co-doping of Na and Cl can effectively alleviate the corrosion of of LiNi0.5Co0.2Mn0.3O2 surface by electrolyte. Therefore, Na and Cl doping can effectively optimize the internal structure of LiNi0.5Co0.2Mn0.3O2 and improve its electrochemical performance. The combination of simulation calculation and experiment provides a new approach for the modification of ternary cathode materials.
通讯机构：
[Jianxiao Yang] H;Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, College of Materials Science and Engineering, Hunan University, Changsha 410082, China
摘要：
Electroless copper plating mechanism of mesophase pitch-based carbon fibers (CFs) by the novel silane couple agents (SCAs) sensitization method was investigated based on the three different functional groups of SCAs (KH550, KH570, KH792). The results showed that relatively stable oligomer films could be formed on the surface of CFs after the sensitization treatment with three kinds of SCAs, which promoted adhesion of CFs with copper plating. Besides, a larger crystalline size, lower resistivity, more uniform and continuous coated copper layers were observed in the copper-plated CFs with KH550 grafting modification (Cu@CF-KH550), in comparison with the copper-coated CFs prepared with KH570 or KH 792 grafting modification (Cu@CF-KH570, Cu@CF-KH792). Moreover, Cu@CF-KH550 had the higher thermal stability than Cu@CF-KH570 and Cu@CF-KH792.
作者机构：
[马小飞; 胡山; 李俊彬; 谌委菊; 卿志和; 周怡波] Hunan Provincial Key Laboratory of Cytochemistry, School of Chemistry and Chemical Engineering, Changsha University of Science and Technology, Changsha;410114, China;[杨盛; 杨荣华] Key Laboratory of Chemical Biology & Traditional Chinese Medicine Research, Ministry of Education, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha;410081, China;[马小飞; 胡山; 李俊彬; 谌委菊; 卿志和; 周怡波] 410114, China
通讯机构：
[Fuchun Gong] C;College of Chemistry and Chemical Engineering, Changsha University of Science and Technology, Changsha 410114, China<&wdkj&>Author to whom correspondence should be addressed.
摘要：
Nitrite (NO2-) is a common pollutant and is widely present in the environment and in human bodies. The development of a rapid and accurate method for NO2- detection is always a very important task. Herein, we synthesized a partnered excited-state intermolecular proton transfer (ESIPT) fluorophore using the "multi-component one pot" method, and used this as a probe (ESIPT-F) for sensing NO2- ESIPT-F exhibited bimodal emission in different solvents because of the solvent-mediated ESIPT reaction. The addition of NO2- caused an obvious change in colors and tautomeric fluorescence due to the graft of NO2- into the ESIPT-F molecules. From this basis, highly sensitive and selective analysis of NO2- was developed using tautomeric emission signaling, achieving sensitive detection of NO2- in the concentration range of 0 similar to 45 mM with a detection limit of 12.5 nM. More importantly, ESIPT-F showed the ability to anchor proteins and resulted in a recognition-driven "on-off" ESIPT process, enabling it to become a powerful tool for fluorescence imaging of proteins or protein-based subcellular organelles. MTT experimental results revealed that ESIPT-F is low cytotoxic and has good membrane permeability to cells. Thus, ESIPT-F was further employed to image the tunneling nanotube in vitro HEC-1A cells, displaying high-resolution performance.
通讯机构：
[Ju-Lan Zeng] H;Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, Hunan Provincial Key Laboratory of Cytochemistry, Department of Chemistry, Changsha University of Science and Technology, Changsha, People’s Republic of China
摘要：
Solid–liquid phase change materials (PCMs) are a kind of important heat energy storage materials that can store/release great amounts of latent heat at a specific temperature or within a narrow temperature range and thus can be applied in a lot of fields related to heat energy storage or thermal management. However, their practical applications are still limited due to formidable challenges such as the risk of leakage, easy phase separation and low thermal conductivity, etc. Silica possesses the merits of cheap, high chemical and physical stability, flame retardancy and relatively high thermal conductivity. It can be applied as both shell material and supporting materials to obtain form-stable PCMs and thus address the aforementioned challenges. In this review, the recent progresses of silica-based form-stable PCMs were summarized. We introduced the main methods for the preparation of the silica-confined composite form-stable PCMs at first. Then, the physical and chemical properties of the reported silica-confined composite form-stable PCMs were summarized and discussed. Finally, some emerging research topics and challenges on silica-based composite form-stable PCMs are proposed.
摘要：
The functionalized benzotriazoles are prepared by palladium catalyzed intramolecular amination of 2bromodiaryltriazene. By screening the reaction conditions, such as ligand, solvent, base and reaction concentration, the optimal reaction conditions were obtained, and 28 functionalized benzotriazole derivatives were successfully prepared up to 99% yield. The method is easy to operate and has good tolerance to diverse functional groups. CO 2021 Elsevier Ltd. All rights reserved.
期刊：
Diamond and Related Materials,2022年126:109079 ISSN：0925-9635
通讯作者：
Yang, Jianxiao(yangjianxiao@hnu.edu.cn)
作者机构：
[Qi, Yong; Shi, Kui; Yang, Jianxiao; Zhang, Jiahui] Hunan Univ, Coll Mat Sci & Engn, Hunan Prov Key Lab Adv Carbon Mat & Appl Technol, Changsha 410082, Hunan, Peoples R China.;[Li, Jun] Changsha Univ Sci & Technol, Sch Chem & Biol Engn, Changsha 410114, Peoples R China.;[Zhang, Xiaxiang] Cent South Univ, State Key Lab Powder Met, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Jianxiao Yang] H;Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, College of Materials Science and Engineering, Hunan University, Changsha 410082, China
期刊：
Journal of Materials Science: Materials in Electronics,2022年33(8):5750-5762 ISSN：0957-4522
通讯作者：
Dai Yimin;Wan, L
作者机构：
[Zhang Yue-fei; Li Yan; Wan Li; Wan, L; Lu Qi; Fang Chengqian; Dai Yimin; Li Yaqi; Wang Zhiheng; Cai Ling; Liu Bo; Chen Ling; Dai, YM] Changsha Univ Sci & Technol, Sch Chem & Chem Engn, Hunan Prov Key Lab Mat Protect Elect Power & Tran, Changsha 410114, Peoples R China.
通讯机构：
[Wan, L ; Dai, YM] C;Changsha Univ Sci & Technol, Sch Chem & Chem Engn, Hunan Prov Key Lab Mat Protect Elect Power & Tran, Changsha 410114, Peoples R China.
摘要：
A new environmental-friendly magnetic cellulosic adsorbent MnFe2O4@Cel-g-p(AA-DMC) was easily synthesized via natural cellulose and easy-recovered magnetic particles MnFe2O4. Magnetic cellulose composites were characterized by SEM, TEM, XPS, XRD, BET, VSM, TGA and FTIR. The effect of pH, contact time and PMS dosage on adsorption was investigated. Besides, the adsorption kinetic model was well-fitted to the pseudo-second-order model, and the adsorption isotherm were matched with the Frenudlich isotherm model. The MnFe2O4@Cel-g-p(AA-DMC) posseses the excellent stability, reusability and superior superparamagnetic behavior and its possible adsorption mechanism for the adsorption of CR was proposed.
通讯机构：
[Tang, Yi] H;Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, Hunan Provincial Key Laboratory of Cytochemistry, School of Chemistry and Chemical Engineering, Changsha University of Science and Technology, Changsha 410114, China.
通讯机构：
[Yan Li; Yue-Fei Zhang] H;Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation & Hunan Provincial Key Laboratory of Cytochemistry, School of Chemistry and Chemical Engineering, Changsha University of Science and Technology, Changsha, People’s Republic of China<&wdkj&>Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation & Hunan Provincial Key Laboratory of Cytochemistry, School of Chemistry and Chemical Engineering, Changsha University of Science and Technology, Changsha, People’s Republic of China
关键词：
Acid fuchsin;Acrolein;Adsorption
摘要：
In this paper, the organic gel polyacrolein (PA(OG)) was prepared by NaOH-induced ionic polymerization with acrolein as raw material, which presented good adsorption performance on acid fuchsin (AF). It has been characterized using BET, FT-IR, zeta potential measurements, and XPS to determine the structural and physicochemical properties of PA(OG). The adsorption performance was examined in relation to contact time, temperature, and pH value. According to the results, polyacrolein gel adsorbent had a fast adsorption rate, and the adsorption process basically reached equilibrium in the first thirty minutes, which agreed with the pseudo-second-order kinetics. It was determined that the adsorption isotherm conformed to the Langmuir model, which was the endothermic spontaneous reaction (Delta H > 0, Delta G < 0). The five executed adsorption-desorption cycles of AF suggested a good reusability of PA(OG). These results can help us better understand the adsorption mechanism of PA(OG) on AF and provide useful treatment method for removing AF.
通讯机构：
[Jinglin Tan; Yue-Fei Zhang] H;Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Chemical Engineering, Changsha University of Science and Technology, Changsha 410114, China
摘要：
Siloxane surfactants, hydrophobic (poly)siloxane chain and hydrophilic polar headgroup linking with spacer ((CH2)3 or (CH2)3S(CH2)3), exhibit peculiarly chemical and physical properties. The aggregation behavior and surface properties of siloxane surfactant can be influenced by the hydrophobicity of spacer. Cationic trisiloxane surfactants ([Si3-C3-Min]Br, [Si3-C4-Min]Br, and [Si3-C5-Min]Br) with the same imidazolium group, hydrophobic heptamethyltrisiloxane, and spacer (different number of methylene) were synthesized. The effect of the spacer on micellization in aqueous solution was investigated. Compared with 1-methyl-3- trisiloxaneimidazolium chloride ([Si3Min]Cl), critical micelle concentration (CMC), effectiveness (pCMC), and minimum area occupied by a surfactant molecule (Alpha min) values of the investigated surfactants decrease with increase the number of methylene in spacer, while, cCMC value increases as the length of spacer increase. The micellization process was enthalpy driven. The AH0m value becomes more exothermic for [Si3-C5-Min]Br attributed to the increasing hydrophobicity of spacer. The AH0m of [Si3-C3-Min]Br is less exothermic than that of [Si3-C4-Min]Br and [Si3-C5-Min]Br. Spherical aggregates with the range of 20-500 nm were formed in aqueous solution at 2 times CMC. (c) 2022 Elsevier B.V. All rights reserved.
通讯机构：
[Dai Yimin] S;School of Chemistry and Chemical Engineering, Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, Changsha University of Science and Technology, Changsha 410114, PR China
摘要：
A magnetic Cl--intercalated Fe3O4@SiO2@MgAl-Cl- LDH nanocomposite has been successfully synthesized by modified one-step salt-assisted coprecipitation process. The Fe3O4@SiO2@MgAl-Cl- LDH nanocomposite was characterized by FTIR, XRD, XPS, SEM, HRTEM, BET and VSM. The results showed that the Fe3O4@SiO2@MgAlCl- LDH particles possessed core (Fe3O4@SiO2) shell (Cl- -LDH) structures and magnetic properties, and Clanions were successfully introduced into LDH interlayers. The unique intercalated structure with week interlayer interaction of Fe3O4@SiO2@MgAl-Cl- LDH provide efficient adsorption of methyl orange (MO), Congo red (CR) and methyl blue (MB), leading to its superior performance with much higher uptake capability with the maximum adsorption capacity of MO, CR and MB reaching 733 mg center dot g- 1, 910 mg center dot g- 1 and 385 mg center dot g- 1, respectively. The adsorption process could be well described by pseudo-second-order model for MO, CR and MB. The experimental data of MO and CR could be fitted better with Freundlich model, while that of MB were fitted better with Langmuir model. The adsorption process was spontaneous and exothermic for MO and MB, while spontaneous and endothermic for CR. Moreover, the adsorbent exhibits excellent stability and reusability in the regeneration cycle, and a process called "post-processing step" is proposed to effectively improve the dye removal ability of the adsorbent in reuse. This study puts forward a new thought for the development of highperformance LDH adsorbents with mesoporous and Cl- intercalation structure for the efficient and rapid removal of dyes.
