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Advances in microwave assisted synthesis of ordered mesoporous materials

中国有色金属学会会刊：英文版 2009年第S3期19卷 656-664页

作者：曹渊魏红娟夏之宁 College of Chemistry and Chemical Engineering Chongqing University College of Bioengineering Chongqing University

Mesoporous materials with uniform pores and high specific areas are used in many fields including catalysts, separation and adsorbents, etc. In order to find faster and more economical synthesis routes, the use of microwave heating was deeply studied. Compared to the hydrothermal method, microwave energy can heat the samples to crystallization temperature rapidly and uniformly result in homogeneous nucleation and shorten crystallization time. The basic principles of microwave assisted synthesis and advantages of microwave heating, and the obtained progress concerning ordered mesoporous materials through microwave synthesis were summarized.

关键词： microwave assisted synthesis ordered mesoporous materials (OMMs) ordered mesoporous silicas (OMSs) periodic mesoporous organosilicas (PMOs)

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CORRELATION OF SiOx LAYER THICKNESS AND PROPERTIES OF BOPP/SiOx COMPOSITE FILMS WITH SPIN COATING PROCESS PARAMETERS

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Chinese Journal of Polymer Science 2013年第2期31卷 333-345页

作者： Xiao-li Yao 马育红 Chang-wen Zhao 杨万泰 Key Laboratory of Carbon Fiber and Functional Polymers Ministry of EducationBeijing University of Chemical Technology State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology

The effects of the spin coating process parameters on the thickness of the SiOx layer of the BOPP/SiOx composite film were investigated. When the concentration of tetraethoxysilane （TEOS） increased from 12.5 vol% to 55% vol%, the SiOx thickness increased from about 80 nm to 470 nm. In the sol time range of 1.5 h to 5 h the SiOx layer thickness reached a maximum at about 4 h and the change of the thickness roughly matched the change of the silica colloidal sphere sizes in sol. When the spin-coating speed of the dispensing stage increased from 450 r/min to 500 r/min, the SiOx layer thickness drastically decreased from about 1.67 gm to 400 nm. While the spin-coating speed of the thinning and drying stage went up to 1200 r/min, the SiOx layer thickness was in the range of 330 nm to 390 nm. It was also found that the SiOx layer thickness was almost increased linearly from about 500 nm to 1.02 gm with the ratio of the commercial silica colloidal to the TEOS from 0.2 to 1.0. The water contact angles decreased to about 23.0° for the BOPP/Si-Sol composite film with 1.67 μm SiOx layer and about 4.0° for the BOPP/mixing Si-Sol composite film with 1.02 μm SiOx layer. Compared to BOPP, the light transparency of the BOPP/Si-Sol composite films decreased by about 5.5% with the SiOx layer from about 80 nm to 1.67 μm and by 7.0% for the BOPP/mixing Si-Sol composite film with the SiOx layer from about 350 nm to 1.02 μm respectively.

关键词： Composites Polypropylene silicas Spin-coating Hydrophilicity.

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