Preparation of Functionalized SiO2 Microspheres by One Step Method
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Functional silica microparticle is a kind of important inorganic non-metallic oxide with a wide range of applications in many fields due to its excellent chemical and thermal stabilities. Post modification is the most common functional method, but, low efficiency. In this paper, a new acid hydrolysis and subsequent alkaline condensation method was developed to prepare SiO2 microspheres with functional groups on surface by condensing or co-condensing functional organosilane precursors (γ-Aminopropyltriethoxysilane (APTES), γ-Mercaptopropyltriethoxysilane (MPTES) and γ-Mercaptopropyltrimethoxysilane (MPTMS) etc) with phenyltrimethoxysilane (PTMS). Series of characterization methods, such as IR, XPS and Raman, demonstrated that the surface of the as-prepared SiO2 microspheres was successfully functionalized with amine or sulfydryl groups. This method may provide a reference for one-step preparation of functional SiO2 microspheres.
KeywordsFunctionalized SiO2 microspheres One-step method Condensation
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The authors are grateful for the financial support provided by the Science and Technology Project of ShenZhen (No. JCYJ20170306154725569), the Science Foundation of Aeronautics of China (No. 2016ZF53059), Key Project of Shanghai Space Foundation (No. SAST2016051) and the financial support provided by the National Natural Science Foundation of Shaanxi (No. 2018JM2028).
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