摘要：
Natural product tea saponin (TS), extracted from the nutshell of camellia (Camellia oleifera Abel, Theaceae), was introduced into intumescent flame retardant formulations as blowing agent and carbon source. The formulations of the flame retardant system were optimized to get the optimum proportion of TS, and intumescent flame retardant coatings containing tea saponin (TS-IFRCs) were then prepared. It was found that TS can significantly affect the combustion behavior and the thermal stability of TS-IFRCs evaluated by cone calorimetry and simultaneous thermal analyzer, respectively. It was shown that TS, degraded to water vapor and carbon at high temperatures, can combine with other components to form a well-developed char layer. The char layer was supposed to inhibit erosion upon exposure to heat and oxygen and enhance the flame retardancy of TS-IFRCs. In addition, the smoke release of TS-IFRCs was also studied, which provided a low amount of smoke production.
摘要：
Electrochemical performances of LiCoO2 as a candidate material for supercapacitor are systematically investigated. LiCoO2 nanomaterials are synthesized via hydrothermal reaction with consequent calcination process. And the particle size increases as the calcination temperature rises.LCO-650 sample with the largest particle size displays the maximum capacitances of 817.5 Fg-1with the most outstanding capacity retention rate of 96.8% after 2000 cycles. It is shown that large particle size is beneficial to the electrochemical and structural stability of Li CoO2 materials. We speculate that the micron-sized waste LiCoO2 materials have great potential for supercapacitor application. It may provide a novel recovered approach for spent LIBs and effectively relieve the burdens on the resource waste and environment pollution.
作者机构：
[Liu, Hao; Sun, Jianliang; Wu, Xing] S China Univ Technol, State Key Lab Pulp & Paper Engn, Guangzhou 510640, Guangdong, Peoples R China.;[Zhou, Pandeng] Hunan City Univ, Sch Chem & Environm Engn, Yiyang 413000, Peoples R China.;[Chen, Shicheng] Michigan State Univ, Dept Microbiol & Mol Genet, E Lansing, MI 48824 USA.
通讯机构：
[Liu, Hao] S;S China Univ Technol, State Key Lab Pulp & Paper Engn, Guangzhou 510640, Guangdong, Peoples R China.
摘要：
The biosynthetic utilization of laccase/mediator system is problematic because the use of organic cosolvent causes significant inhibition of laccase activity. This work explored how the organic cosolvent impacts on the laccase catalytic capacity towards 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) in aqueous solution. Effects of acetone on the kinetic constants of laccase were determined and the results showed K<sub>m</sub> and V<sub>max</sub> varied exponentially with increasing acetone content. Acetone as well as some other cosolvents could transform ABTS radicals into its reductive form. The content of acetone in media significantly affected the radical scavenging rates. Up to 95% of the oxidized ABTS was successfully recovered in 80% (v/v) acetone in 60 min. This allows ABTS recycles at least six times with 70%–75% of active radicals recovered after each cycle. This solvent-based recovery strategy may help improve the economic feasibility of laccase/ABTS system in biosynthesis. View Full-Text
摘要：
Objective To investigate the flexibility and mobility of the Bacillus thuringiensis toxin Cry1 Aa. Methods The graph theory-based program Constraint Network Analysis and normal mode-based program NMsim were used to analyze the global and local flexibility indices as well as the fluctuation of individual residues in detail. Results The decrease in Cry1 Aa network rigidity with the increase of temperature was evident. Two phase transition points in which the Cry1 Aa structure lost rigidity during the thermal simulation were identified. Two rigid clusters were found in domains I and II. Weak spots were found in C-terminal domain III. Several flexible regions were found in all three domains; the largest residue fluctuation was present in the apical loop2 of domain II. Conclusion Although several flexible regions could be found in all the three domains, the most flexible regions were in the apical loops of domain II.
作者机构：
[He Guo-wen; Li Fen-fang] Cent S Univ, Sch Chem & Chem Engn, Changsha 410083, Peoples R China.;[He Guo-wen; Wen Jie-bin] Hunan City Univ, Coll Chem & Environm Engn, Yiyang 413000, Peoples R China.;[Wen Jie-bin] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China.
通讯机构：
[Li Fen-fang] C;Cent S Univ, Sch Chem & Chem Engn, Changsha 410083, Peoples R China.
关键词：
N, N-dimethylacetamide (DMAc);sliver nanoparticles;polyvinyl pyrrolidone (PVP);preparation
摘要：
A silver nanoparticle（Ag NP） with good monodispersity was produced by a convenient method for reducing of Ag NO3 with N, N-dimethylacetamide in the presence of polyvinyl pyrrolidone（PVP） as the surface modification agent. The shape and size of the Ag NP with reaction time were taken as variables. The surface plasmon band transition was monitored with reaction mixture time at different temperatures. The Ag NP crystallinity increases with the reaction time, and the reduction efficiency is very low when Ag NP solution is dealt at room temperature even after two days, while it is greatly improved at 160 °C only for 25 min. Ag NP modified by the as-synthesized PVP has a face-centered cubic crystalline structure, in which Ag NP could develop into a spherical morphology with a very narrow size distribution of 2-11 nm. The preparation provides a new reducing agent to form Ag NP with simpler operation and shorter time.
摘要：
In this work, we propose a method for constructing silver nanoparticles (AgNPs) on mesoporous silica nanospheres (MSNs) by a DNA-templated process. By in situ formation, the gatekeeper can be easily modulated to meet different degrees of glutathione (GSH) stimuli for location-specific drug release.
作者机构：
[赵运林; 周小梅] College of Architecture and Urban Planning, Hunan City University, Yiyang, 413000, China;[胥正钢] College of Bio-Safety Science and Technology, Hunan Agricultural University, Changsha, 410128, China;[董萌; 库文珍] College of Chemistry and Environment Engineering, Hunan City University, Yiyang, 413000, China
通讯机构：
[Zhao, Y.] C;College of Architecture and Urban Planning, Hunan City University, Yiyang, China
期刊：
Asian Journal of Chemistry,2014年26(21):7373-7376 ISSN：0970-7077
通讯作者：
Li, F.
作者机构：
[Li F.] School of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China;[Zhu M.; Luo Q.] College of Chemical and Environmental Engineering, Hunan City University, Yiyang, 413000, China;[He G.] School of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China, College of Chemical and Environmental Engineering, Hunan City University, Yiyang, 413000, China
通讯机构：
[Li, F.] S;School of Chemistry and Chemical Engineering, Central South University, Changsha, China
作者：
Li, L.;Manhong, H.*;Zliping, L.;Zhe, S.;Donghui, C.
期刊：
Asian Journal of Chemistry,2014年26(20):7055-7060 ISSN：0970-7077
通讯作者：
Manhong, H.
作者机构：
[Zhe, S.; Manhong, H.] School of Environmental Science and Engineering, Donghua University, Shanghai, 201620, P.R., China;[Zliping, L.] School of Chemical and Environmental Engineering, Hunan City University, Yiyang, 413000, China;Shanghai Institute of Technology, Shanghai, 200235, P.R., China;[Donghui, C.] School of Environmental Science and Engineering, Donghua University, Shanghai, 201620, P.R., China, Shanghai Institute of Technology, Shanghai, 200235, P.R., China;[Li, L.] School of Environmental Science and Engineering, Donghua University, Shanghai, 201620, P.R., China, School of Chemical and Environmental Engineering, Hunan City University, Yiyang, 413000, China
通讯机构：
[Manhong, H.] S;School of Environmental Science and Engineering, Donghua University, Shanghai, China
摘要：
Silver(I) phosphate (Ag3PO4) photocatalysts were synthesized via a facile solid phase ion-exchange method, X-ray diffraction, scanning electron microscopy and UV-visible diffuse reflectance spectroscopy (DRS) were used to characterize the as-prepared samples. The photocatalytic performance and mechanism of as-prepared samples were investigated by the degradation of tetracyclines in aqueous solution under visible light irradiation (λ > 420 nm). The results indicated that the as-prepared samples were irregular spherical morphology with paticle size of 0.5-1.5 μm and exibited strong light absorbance in the visible light region. The superior photocatalytic activity and removal efficiency of total organic carbon (TOC) were also observed. The mechanism expriment results demonstrated that the O_2~(·-), ~·OH and hole were all reactive oxygen species and the possible photocatalytic mechanism was proposed.
