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Effect of charge type of hydrogel on its dye adsorption capacity and kinetic study
Qiuyu Liang,Mingyu Yin,Shi Feng,Xu Xiang 한국고분자학회 2024 Macromolecular Research Vol.32 No.3
Hydrogel has a wide range of applications in many fields because of its good adsorption capacity. There are many factors affecting the adsorption performance of hydrogels, among which the charge of the gel itself is crucial. This work proposes a method to detect the amount of dye adsorbed by measuring the absorbance of hydrogels. Using this method, polyacrylamide (PAM) hydrogels with different charge types were prepared, and their adsorption performance on Congo red and methylene blue dyes was investigated to elucidate the relationship between the charge carried by the hydrogel itself and the adsorption performance. Experiments show that the adsorption capacity of hydrogel for dyes is closely related to its charge, that is, the hydrogel is more likely to adsorb dye molecules with an opposite charge to the hydrogel and the adsorption behavior conforms to the Freundlich isothermal adsorption model. Taking anionic hydrogel as an example, the adsorption kinetics of methylene blue on anionic hydrogel were further studied, and the kinetic model was in accordance with the pseudo-secondary kinetic model, suggesting that a pseudo-second-order kinetic model is more suitable for the adsorption behavior of anionic hydrogels for methylene blue dye. This work helps researchers better understand the role of the charge of hydrogel in the adsorption process and helps to design more targeted hydrogels.
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Venture Capital Backing and Issuance of Seasoned Equity Offerings: Evidence from China
Juncheng Li,Songling Yang,Hemei Li,Qiuyue Zhang,Qianqian Shi 한국증권학회 2020 Asia-Pacific Journal of Financial Studies Vol.49 No.6
We analyze how venture capital (VC) affects the timing of seasoned equity offering (SEO) issuance and the post-SEO performance of Chinese companies during the 2006–2018 period. Empirical analysis confirms that VC “accelerates” SEO issuance because of greater financing demands. Thus, VC-backed firms prefer to issue their first SEOs earlier than non-VC-backed firms. Moreover, quick SEOs promoted by venture capitalists are more underpriced because of information asymmetry.
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An Optimized Multi-load Wireless Power Transfer System with Constant Load Currents
Zhe Zhou,Weiguo Li,Chenwen Cheng,Zhanfeng Deng,Fangyi Li,Qiuyu Shi,Chris Mi 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper proposes a multi-load wireless power transfer (WPT) system using repeater coils. The repeater unit that contains two repeater units is designed. The series-parallel-series (SPS) compensation method is used for each repeater unit. The constant load current for all the loads can be obtained with suitable resonant condition when neglecting the coils’ parasitic resistances. A feasible coil structure is designed where the two repeater coils in the same repeater unit are both bipolar that are placed perpendicularly so that the coupling between them can be neglected. A ferrite plate is inserted between the two bipolar coils in each repeater unit to enhance the magnetic coupling between adjacent units. Moreover, the proposed system has been optimized so that the system efficiency can be improved. The simulation results are given to validate the effectiveness of the proposed WPT system.
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