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Fabrication of the Pesticide-Attapulgite composites regulated by mixed-surfactants
Jiexiang Liu,Ruili Bai,Xiaoguang Zhang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.119 No.-
The SB (DTAB, TTAB, CTAB, OTAB)-AP complex was obtained by modifying attapulgite (AP) with surfactantof SB (DTAB, TTAB, CTAB, OTAB). The structures were characterized by XRD, FT-IR, TGA/DTA and SEM. A new lamellar structure is formed by introducing surfactant. The basal spacing increases with theincrease of alkyl chain length of cationic surfactants. Then, the beta-cypermethrin (BCT) composites ofBCT/SB-AP, BCT/DTAB (TTAB, CTAB, OTAB)-SB-AP were prepared and investigated. The basal spacingsof BCT composites were larger than those of SB-AP and the corresponding DTAB (TTAB, CTAB, OTAB)-AP. The existence of BCT and surfactants molecules into BCT composites was further confirmed. TheBCT/DTAB (TTAB, CTAB, OTAB)-SB-AP have the smaller specific surface areas than DTAB (TTAB, CTAB,OTAB)-AP due to the increase of AP exfoliation in the presence of SB. Fabrication mechanism of BCT compositeswas put forward. Release behaviors of BCT were investigated and analyzed in different buffersolutions. The existence of mixed-surfactants influenced distinctly the release rates. BCT compositeshad the slow release property. The release behaviors were well fitted by pseudo second-order and parabolicdiffusion models. This study provided a new approach to improve the utilization efficiency of pesticideand could be applied as a pesticide delivery system.
符杰祥(Jiexiang Fu) 한국동서비교문학학회 2013 동서 비교문학저널 Vol.0 No.29
Detailed reading Lu Xun’s texts when he stayed in Japan, this paper has questioned many present popular “conclusions” in the academic circles. “Today’s China” in Lu Xun’s period was malaise and no “modern”, but in exotic Japan, the modern achievements and problems were both obvious, so he might as well get an experience of modernity to “understand thoroughly the general trend of the world”. Lu Xun’s criticism of modernity is not flatly denies the meaning of modernization theory, the “bad reputation” of the new doctrine lies in that the language is “new”, but there is no corresponding “new spirit”. Lu Xun puts forward the subject of the “cultivating person”, instead of sharply demarcating from the modernization theory, it is to establish spirit foundation which modern people need. In this way, the unique and true value of Lu Xun’s thinking about “today’s China” is not to “surpass”, but to “seek roots”.
Preparation of Modified Nano-SiO₂ Oil Dispersion System and the Stability of Its O/W Emulsion
Zhibin Zhou,Jiexiang Wang 한국고분자학회 2016 폴리머 Vol.40 No.2
Nano-SiO₂ was organically modified with silane coupling agent-KH570 to prepare the modified Nano-SiO2 oil dispersion system. By increasing the dosage of KH570, the ζ-potential (absolute value) and the char yield values decreased gradually. When KH570 was 5%, the maximum contact angle with water reached 79.8°. Then, the modified Nano-SiO₂ was composed with petroleum sulfonate (PS) and its ability of reducing the O/W interfacial tension was measured. The results showed that, O/W interfacial tension reduced to about 5.86×10<SUP>-3</SUP> mN/m when the Nano-SiO₂ and petroleum sulfonate composite was mixed with the mass fraction of 0.2:0.3%. The emulsion stability coefficient was 2.15 after 120 min which was the minimum. It indicated that this compounded system had the best emulsifying ability because Nano-SiO₂ particles were dragged onto the O/W interface by the PS molecules to improve the intensity of O/W interface.