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报道了一种利用硬脂酸对纳米TiO2进行有机表面修饰的新方法,主要包括纳米TiO2水分散液的制备和把纳米TiO2粒子由水分散液中转移到溶有硬脂酸的甲苯溶液中两个过程。采用红外光谱(FT-IR)、X射线光电子能谱(XPS)、热分析(TG-DTA)、透射电镜(TEM)、粒度分布、紫外-可见光谱和分散性实验等对所得的样品进行了表征。红外光谱和X射线光电子能谱说明硬脂酸以双齿配位的方式化学键合在纳米TiO2表面。表面元素分析和热分析数据表明,在纳米TiO2表面的硬脂酸化学修饰层的均匀性和致密性通过本方法得以改善。透射电镜、粒度分布、紫外-可见透过率光谱和分散性实验结果说明,本方法克服了传统方法的缺点,有机表面修饰后的纳米TiO2具有分散性好、团聚粒径小、粒度分布窄、可见光透过率高和紫外线屏蔽能力强的优点。
A new method for the surface modification of nano-TiO2 with stearic acid is reported. The preparation method includes the preparation of nano-TiO2 aqueous dispersion and the transfer of nano-TiO2 particles from the aqueous dispersion into the solution of stearic acid in toluene A process. The obtained samples were characterized by FT-IR, XPS, TG-DTA, TEM, particle size distribution, UV-Vis and dispersibility experiments Characterization. FTIR and X-ray photoelectron spectroscopy show that stearic acid is chemically bonded to the surface of nano-TiO2 with bidentate coordination. Surface elemental analysis and thermal analysis data show that the uniformity and compactness of the stearic acid chemical modification layer on the surface of the nano-TiO2 are improved by the method. The results of transmission electron microscopy, particle size distribution, UV-Vis spectrum and dispersibility show that the method overcomes the shortcomings of the traditional methods. The nano-TiO2 with organic surface modification has good dispersibility, small agglomeration particle size, narrow particle size distribution, Visible light transmittance and ultraviolet shielding advantages.