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    题名: Preparation of almost dispersant-free colloidal silica with superb dispersiblility in organic solvents and monomers
    作者: Huang, Feng-Hsi;Chang, Chao-Ching;Oyang, Tai-Yueh, Chen, Ching-Chung;Cheng, Liao-Ping
    贡献者: 淡江大學化學工程與材料工程學系
    关键词: Surface modification;Sol–gel;Silica nanoparticle;Colloidal silica
    日期: 2011-09
    上传时间: 2011-09-27 16:44:17 (UTC+8)
    出版者: Dordrecht: Springer Netherlands
    摘要: Surface modification of silica nanoparticles synthesized by the sol–gel process was performed using coupling agents, 3-(trimethoxysilyl) propyl methacrylate (MSMA) and/or trimethyethoxylsilane (TMES). The chemical structures of the formed particles were analyzed by means of Fourier Transform Infrared Spectroscopy (FTIR) and solid-state Si-Nuclear Magnetic Resonance (Si-NMR), and the particle sizes were determined by Transmission Electron Microscopy (TEM) imaging. The latter results indicate that such surface modifications can effectively lessen the serious aggregation being common to pure silica nanoparticles. In some cases, separate particles of ca. 5–10 nm dia. could be obtained, when both MSMA and TMES were employed during the modification process. Dynamic light scattering method was adopted to examine the stability of the prepared silica sols during a long-term storage. It was found that the aggregation phenomenon can essentially be eliminated in case that the surface of silica contained sufficient amount of TMES moiety. Vacuum distillation was used to remove the volatile components such as methanol, ethanol, and water from the silica sol. The condensed product, containing 2 wt% residual solvent, appeared as a uniform transparent paste-like material, which can be dispersed in common organic solvents and monomers within a few seconds.
    關聯: Journal of Nanoparticle Research 13(9), pp.3885-3897
    DOI: 10.1007/s11051-011-0342-y
    显示于类别:[化學工程與材料工程學系暨研究所] 期刊論文

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