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Lingxin Li,Han Li,Yanju Long,Shan Wang,Yu Chen,Sifeng Zhang,Lulu Wang,Lijun Luo,Fengzhi Jiang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.1
In the present work, a direct Z-scheme AgI/BiOBr heterojunction displaying improved photocatalytic activity was designed by a chemical bath deposition method. The obtained photocatalysts were systematically characterized through XRD, SEM, XPS, BET and UV-Vis diffuse reflectance spectroscopy. The synthesized AgI/BiOBr photocatalyst displayed superior photocatalytic performance in the case of 17α-ethinylestradiol (EE2), where 97.0% compound has been removed within 9 min of irradiation. The rate constant using AgI/BiOBr photo-catalyst was 16.0 and 138.7 times more than that of pure AgI and BiOBr, respectively. Furthermore, the photocatalytic mechanism was investigated. The results of this study indicated that AgI/BiOBr was a stable and efficient photocatalyst, with promising practical applications.
Yanju Wu,Mingxiu Lv,Bei Li,Junda Ge,Lin Gao 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.3
The electrodeposition of a film of reduced graphene oxide (ERGO) with well-dispersed on a glassy carbon electrode (GCE) was achieved using cyclic voltammetry (CV) in a graphene oxide (GO) colloidal solution. Using square wave adsorptive stripping voltammetry (SWASV), the ERGO film was applied for the first time, in developing a high-sensitive electrochemical sensor for detection of taxifolin. Compared with bare GCE, the resulting electrodes (ERGO/GCE) exhibited excellent response toward the oxidation of taxifolin by significantly enhancing the oxidation peak currents and the decreased peak-to-peak separation. Under selected conditions, the reduction peak currents had linear relationship with taxifolin concentration in the range of 5.0 x 10-8 - 1.5 x 10-5 mol L-1, with detection limit of 4.0 x 10-9 mol L-1. Besides, the method was successfully applied to the quantitative determination of taxifolin in the Prince's-feather fruit with satisfactory results.
Sufang Chen,Yanju Qiu,Xixi Xing,Cunwen Wang,Chengchao Liu,Yuhua Zhang,Jingping Hong,Jinlin Li,Daohong Zhang 한국고분자학회 2020 Macromolecular Research Vol.28 No.3
Among the Fischer-Tropsch synthesis (FTS) catalysts, Cobalt catalysts are currently attracting a lot of research interests due to their high activity and high selectivity. But the dispersion and reducibility of cobalt catalysts with moderate interaction between cobalt and support are still a challenge. A novel amino-ended hyperbranched polyamide (AEHPA) was used to modify SBA-15 and then was applied as support for obtaining cobalt catalyst (15Co/SBA-15-N). The catalysts were characterized by XRD, TEM, XPS and H2-TPR techniques. The results showed that AEHPA doped mesoporous SBA-15 caused the generation of N species in the SBA-15 pore channels. The N-Co bonds resulted in the formation of highly-dispersed cobalt nanoparticles with uniform sizes inside the ordered mesopores of support. AEHPA doping was an effective way to modify the surface properties of the SBA-15 for immobilizing cobalt nanoparticles. Compared with the conventional 15Co/SBA-15 catalyst without doping AEHPA, the AEHPA doped 15Co/SBA-15-N catalyst showed improved cobalt dispersion and stabilized cobalt location, which led to much better reaction stability as well as C5+ selectivity.
Electric field induced variation of temperature and entropy in dielectric elastomers
Liwu Liu,Jinrong Li,Yanju Liu,Jinsong Leng,Junqing Zhao,Jianwen Zhao 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.1
Dielectric elastomer is a kind of typical electro-active polymer material. Under external electric field it can produce large electrostrictiondeformation and possesses the advantages of high elastic energy density, super short response time, high efficiency, and so on. It iswidely used in the artificial muscles, facial expressions, actuators, energy harvesters, sensors, robots and Braille display devices, and alsoshows huge application potential in the aerospace and intelligent bionic areas. We built the free energy of the dielectric elastomer electrical-mechanical coupling system and investigated its constitutive relation and stability behavior. Then we calculated the elastomer’s criticaldeformation suffering from the voltage. If electrical breakdown, electromechanical instability and snap-through instability can beavoided, the large electrostriction deformation can induce adiabatic temperature change and isothermal entropy change of the dielectricelastomer. We used the entropy-temperature or electric displacement-electric field plane to describe the temperature change and entropychange of dielectric elastomer undergoing large electrostriction deformation. With the influence of temperature, we developed a temperatureand deformation coupling thermodynamical free energy model to calculate the electric field induced variation of temperature andentropy in dielectric elastomers. The results should offer great help in guiding the design and fabrication of excellent actuators featuringsoft dielectric elastomers.