A Study on Surface Modification of Nano-scale TiO_2 by Hexadecanoic Acid

摘要

[中文文摘]以亲油改性为目的,选用棕榈酸为改性剂对纳米TiO2进行表面改性,使TiO2表面由亲水疏油性变为亲油疏水性;研究了有机改性的影响因素,并用TEM,IR,Zeta(ζ)电位等多种手段对改性效果进行表征,确定了最佳改性温度和最佳改性时间;结果表明,当改性温度为100℃,改性时间为1.5 h时,纳米TiO2的改性效果最好.[英文文摘]The surface modification of nano-scale titanium dioxide(TiO_2) and the effect factors are studied by using hexadecanoic acid as modifier.And the surfaces of titanium dioxide(TiO_2) are modified from hydrophilic to hydrophobic and a covalent bond is formed by chemical reaction between the surface hydroxylic groups and organic long-chain molecules such as hexadecanoic acid.The modified titanium dioxide(TiO_2) can be well dispersed in hexane.The structure and morphology are characterized by Transmission Electron Microscope (TEM), Infrared Spectra (IR) ,Zeta potential (ζ) etc and the optimal modification time and the optimal temperature are determined. The results show that the modification effect and dispersion effect of nano2scale titanium dioxide (TiO2) are optimal when the modification time is 1.5h and the temperature is 100 ℃.