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    題名: Preparation of solvent-dispersible nano-silica powder by sol-gel method
    作者: Chao-Ching Chang;Jo-Hui Lin;Liao-Ping Cheng
    關鍵詞: Nanoparticles;Dispersible;Sol-gel;Silica
    日期: 2016-12
    上傳時間: 2016-08-15
    摘要: Solvent dispersible nano-silica powder was prepared by a dual-step sol-gel process: first, SiO_2nanoparticles were synthesized through acid-catalyzed hydrolysis and condensation of tetraethyl orthosilicate in 2-propanol aqueous solution. Then, the particles were surface-modified by means of the capping agent trimethylethoxysilane (TMES). The formed product, termed TSiO_2 nanopowder, was dispersible in many organic solvents, and the dispersibility was found to depend on the amounts of TMES bounded to the SiO_2 nanoparticles. FTIR spectra of TSiO_2 samples confirm Si-O-Si linkage being formed between TMES and SiO_2 through the capping reaction. The sizes of TSiO_2 dispersed in various solvents, as determined by dynamic light scattering (DLS), fell largely over the range 2-20 nm for solvents with solubility parameters of 16-29.6 MPa^(1/2). TEM imaging of the nanoparticles indicated that they were well separated with the largest identifiable size of ~10 nm, agreeing with the results obtained from DLS.
    關聯: Journal of Applied Science and Engineering 19 (4), pp.401-408
    DOI: 10.6180/jase.2016.19.4.03
    顯示於類別:[化學工程與材料工程學系暨研究所] 期刊論文


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