Abstract:

The surface organic modification of rutile nano-TiO₂ with n-ctyltriethoxysilane（LM-N308）by the phase transfer method was studiedThe asprepared samples were characterized with Fourier transform infrared spectra（FTIR），thermogravimetry（TG），differential thermal analysis（DTA），X-ray photoelectron spectroscopy（XPS），high resolution transmission electron microscopy（HRTEM）and the degree of oilaffinity experiment，respectivelyAccording to the spectra of FTIR and XPS，it was inferred that the LM-N308 was bound on the surface of nano-TiO₂ particlesHRTEM results showed that an even coating layer of LM-N308 on nano-TiO₂ surface was formed，and the thickness of the coating layer was about 2 nmData from TG and oilaffinity experiment indicated that the saturated mass fraction of chemisorptive LM-N308 on nano-TiO₂ surface was 7.0%—9.7%The dispersivity experiment revealed that the surface property of nanoTiO₂ modified with LM-N308 was changed from hydrophilicity to hydrophobicity.

Key words:

相转移法;纳米TiO₂, 正辛基三乙氧基硅烷, 有机表面改性

摘要：

以正辛基三乙氧基硅烷（LM-N308）为有机表面改性剂，用相转移法对金红石相纳米TiO₂进行有机表面改性。采用了傅里叶变换红外光谱（FTIR）、热分析（TG-DTA）、X 射线光电子能谱（XPS）、高分辨透射电镜（HRTEM）、亲油化度实验等对所得的纳米TiO₂进行了表征。红外光谱和X射线光电子能谱表明LM-N308以化学键合的方式结合在纳米TiO₂表面。HRTEM结果显示，在纳米TiO₂的表面存在厚度均匀约2 nm的有机包覆层。TG和亲油化度实验数据表明，纳米TiO₂表面化学吸附的LM-N308的饱和质量分数为7.0%～9.7%。分散性实验表明，经LM-N308表面改性的纳米TiO₂由亲水性变成了疏水性。

关键词:

相转移法;纳米TiO₂, 正辛基三乙氧基硅烷, 有机表面改性