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Tuning alginate-bentonite microcapsule size and structure for the regulated release of *** Rs-198

Chinese Journal of Chemical Engineering 2022年第8期35卷 12-20页

作者： Jiawei Dong Yanhui He Junfen Zhang Zhansheng Wu School of Chemistry and Chemical Engineering Shihezi UniversityShihezi 832003China Xi’an Key Laboratory of Textile Chemical Engineering Auxiliaries School of Environmental and Chemical EngineeringXi’an Polytechnic UniversityXi’an 710000China

In this study, different sizes of microcapsules with alginate and bentonite as natural macromolecular materials were prepared to investigate the release property of Pseudomonas putida Rs-198. The characteristics of three microcapsules were evaluated by SEM, FTIR, TG-DSC, XRD and wall thickness. The sizes of three microcapsules(MA, MB, and MC) were 1270.50, 831.79 and 42.52 μm, respectively. First, the encapsulation efficiency of three MA, MB, and MC microcapsules were 82.20%, 90.41%, and 85.84%, ***, the contact angles of MA and MB samples were similar, while smaller microcapsules MC have higher contact angle(85.05°), indicating poor hydrophilia and decreasing the swelling degrees. Third,the release cumulant of Rs-198 and macromolecule BSA linear stage was fitted to self-established mathematic model. Results show that the microcapsule size had a considerably positive effect on release detail. The large microcapsule possessed strong leak-tightness for Rs-198 as a slow-release microbial agent. Furthermore, the porosity of microcapsules determined their swelling and release and may affect bacterial growth and survival. In conclusion, the Rs-198 microcapsule with different sizes will be pertinently selected based on the characteristics of agricultural production requirements.

关键词： Microcapsules sizes Alginate-bentonite Release model swelling degree

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Gelation and swelling Behavior of Oxidized Konjac Glucomannan/Chitosan Hydrogel

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Wuhan University Journal of Natural Sciences 2002年第4期7卷 481-485页

作者： He Dong bao, Shi Xiao ming, Shi Yi, Zhang Dong feng College of Resource and Environmental Science, Wuhan University, Wuhan 430072 Hubei, China College of Resource and Environmental Science Wuhan University Wuhan Hubei China

The gelating and swelling mechanisms of the hydrogel formed from oxidized konjac glucomannan (OKGM) and chitosan (CS) were studied by Fourier transform infrared (FT-IR) spectrometry. FT-IR spectra illustrate that the interaction of polysaccharides forms the hydrogen bonds and interchain salt bonds and the dissocation of which dominates the swelling behavior in buffer solutions of different pH. The concentration of salt ion has effect on swelling behavior through the difference of salt ion concentration between in solution and in network of hydrogel, which causes penetrating pressure. Moreover, the swelling degree and hydrogel strength could be modulated by varying conditions. It is indicated that the hydrogel has pH-sensitive and salt ion sensitive properties. The prepared optimum condition selected by varying conditions is thatr=0.2;t=30 min;T p

关键词： Key Words oxidized konjac glucomannan chitosan hydrogel swelling degree

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维普期刊数据库

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Hollow Polymer Nano-latex Microspheres Prepared by In-situ Polymerization with the Method of Encapsulation Non-solvent

Hollow Polymer Nano-latex Microspheres Prepared by In-situ P...

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2014中国功能材料科技与产业高层论坛

作者： Qinghui Shao Teng Yuan Zhuo Chen Jian-qing Hu Weiping Tu Feng Wang School of Chemistry and Chemical Engineering South China University of Technology School of Light Industry and Food Sciences South China University of Technology

In this paper,the hollow polymer nano-latex microspheres with uniform size and good monodisperse made by in-situ polymerization with the method of encapsulation non-solvent,and the effect of crosslinking monomer（DVB）dosage in the shell on the morphology and opacity of the hollow polymer nano-latex microspheres were investigated by the characterization methods of particle size analysismeter,viscosity meter,acid value analysis,SEM,TEM and UV-Vis *** results show that under the other conditions and MAA dosage of the shell unchanged,when the crosslinking monomer dosage of the shell was less than 15wt%,with the reduce of the crpsslinking monomer dosage in the shell,the strength of the shell of the hollow polymer nanolatex microspheres trends decrease,when poreswelled,the hollow polymer nano-latex microspheres were easily cracked and collapsed;when the dosage was greater than 20wt%,with the increase of the crosslinking monomer dosage in the shell,the strength of the shell and particle size of the hollow polymer nano-latex microspheres trends increase and decrease respectively,it becomes difficult to swell;when the dosage is between 15-20wt%,the dry film of the emulsion containing the hollow polymer nano-latex microspheres obtained the the optimal opacity performance.

关键词： In-situ polymerization Hollow polymer Latex microspheres Crosslink monomer swelling degree Opacity

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