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- 저자 : Qiuyu Liang (검색결과 2 건)
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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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Qiuyue Du,Song Chen,Shuo Cheng,Fengshan Du,Liang Li,Quantong Li,Limei Zhang 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.6
The integrated electric wheel module (IEWM) with large-angle steering capability is blooming which greatly alters the conventional chassis structure over recent years. The IEWM brings challenges to the suspension system due to higher requirements, which includes 360 degrees steering, active adjustment of chassis height and posture, superior ride comfort, and compact mechanical structure. Hence, a novel double trailing arm suspension mechanical system for the aforementioned IEWM and its control strategy are studied to get better driving maneuverability, ride comfort, driving safety, and posture stability of automobiles in this paper. The 6 degree of freedom (DOF) roll model of active suspension vibration with seats and multiobjective optimization controller are constructed for vehicle posture active control to solve the difficult trade-off between suspension dynamic deflection, roll angle, and seat vertical acceleration. The controller weight coefficients are optimized by an improved genetic algorithm (IGA) method, and the fitness function in piecewise form is adopted to reduce the search range. The simulation analysis shows that the combination of IGA and a multi-objective controller can defuse the conflict of goals between different suspension performance evaluation indexes, which also improves the overall suspension performances compared with the experience adjustment method and passive suspension system. In detail, this simple optimization control strategy can reduce the vertical acceleration root mean square value (RMSV) of the left and right seat by 45 % and 11 %, respectively; the left and right tire dynamic load decreased by 13 % and 2 %, respectively; and 25 % reduction in roll angle. These performance improvements only sacrifice part of suspension dynamic deflection RMSV increase, but do not affect driving safety.
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