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- 저자 : Qiuyu Xu (검색결과 4 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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Polymerized Ionic Liquid for the Regulation of Phase Structure of PLA/PCL Blends
Yiyang Zhou,Qiuyue Meng,Ping Wang,Haibing Wei,Pei Xu,Yunsheng Ding 한국고분자학회 2022 Macromolecular Research Vol.30 No.9
Polymerized ionic liquid containing block structure (PIL) has been used as regulator for the phase structure of poly(lactide) (PLA)/poly(ε-caprolactone) (PCL) blends. The phase structure, crystallization, rheology behavior and mechanical properties of PLA/PCL and PLA/PCL/PIL blends were systematically investigated. PIL could be located in PCL phase or at the PLA/PCL interface, enhancing the interaction between polymer components. The crystallization ability of PLA and PCL was simultaneously enhanced with the addition of PIL, since the plasticization effect of ionic moiety and PEO segments in PIL as well as the nucleation effect of PIL-formed ionic cluster. When PIL content was 0.5 wt%, the PLA/PCL/0.5PIL blend system exhibited much better mechanical properties than additivefree PLA/PCL blend. But as PIL contents increased, the significantly change in viscosity ratio between PLA and PCL would lead to obviously change in phase structure of PLA/PCL blend, thus the mechanical properties of the blends would be degraded.
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Preparation and Investigation of Fe3O4@rGO/CNF Foams for Electromagnetic Interference Shielding
Mengmeng Li,Qiuyu Xu,Wei Jiang,Amjad Farooq,Yirui Qi,Lifang Liu 한국섬유공학회 2023 Fibers and polymers Vol.24 No.2
Herein, Fe3O4nanoparticles and graphene oxide (GO) are compounded first, followed by the addition of cellulose nanofiber(CNF) and l-ascorbic acid, to obtain Fe3O4@reduced graphene oxide (rGO)/CNF foams via the freeze-drying method. Theelectrical conductivity and magnetism of as-prepared foams were improved due to the presence of rGO and Fe3O4,whichis suitable for electromagnetic interference (EMI) shielding material. The results exhibit that Fe3O4@rGO/CNF foams allpossess a porous structure, and the optimized foam shows an EMI shielding effectiveness value of ~ 23 dB in the X-band. The good EMI shielding performance of the Fe3O4@rGO/CNF foam originates from the synergy of its composition andstructure. This work could provide a reference for the design and fabrication of novel EMI shielding materials.
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Jinlong Zhang,Jingkun Lu,Bing Liu,Qiuyue Liu,Fan Jin,Miaojun Zhang,Yerong Liu,Yujun Song,Chenhui Dong,Wanyi Zhang,Ningxu Han,Xu Deng,Feng Xing 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.S1
Quantification of viable spores is a time taking task due to the lack of rapid, efficient and accurate methods. This studypresented a simple spectrophotometric method for the detection of viable spores based on spore’s property of losing refractivityduring the germination process. By comparison of the results obtained by both spectrophotometric method and colonycounting method, a good linear correlation (R2 = 0.99) was achieved between viable spore concentration and OD loss underappropriate conditions. To avoid interference from ungerminable spores and vegetative cells, a turbidity complementationstrategy of keeping the initial concentration of spore suspensions at the same and relatively lower level was required. Thecalibration equation developed could be used to predict the viable spore yield produced in a series of fermentation experiments. The experimental results proved that this novel spectrophotometric method was sensitive, rapid, and easy to performcompared to conventional colony counting method.
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