摘要
利用硅烷偶联剂(KH鄄550)对表面包覆氧化硅的金红石相纳米TiO2进行了有机表面改性。采用红外光谱(IR)、X射线光电子能谱(XPS)、热分析(TG鄄DTA)、BET、透射电镜(TEM)、润湿性和分散性实验等对表面改性前后的纳米TiO2进行了表征。红外光谱和X射线光电子能谱表明,KH鄄550以化学键合的方式结合在纳米TiO2的表面,并形成了有机包覆层。经测量,纳米TiO2表面的KH鄄550的质量分数约为2.0%。讨论了产生KH鄄550理论包覆量与实际包覆量差异的原因。TEM、TG和BET得出的结果显示,在纳米TiO2有机表面改性过程中存在明显的团聚现象,改进分散纳米TiO2的方法是提高有机改性效果的关键。润湿性实验和分散性实验表明,经KH鄄550表面改性的纳米TiO2同时具有亲水性和亲油性。
The surface organic modification of nanosized TiO2 pre-coated with silica in the rutile phase with silane coupling reagent KH-550, was studied. The prepared samples were characterized by FTIR, XPS, BET, TEM, TG and DTA techniques. According to the spectra of FTIR and XPS, it was inferred that the KH-550 was bound on the surface of nanosized TiO2 particles and an organic coating layer also formed. The mass fraction of KH-550 on the surface of nanosized TiO2 was measured to be about 2.0%. The influence factors which resulted in difference between experimental quantity and theoretical quantity of KH-550 bound on the surface of nanosized TiO2 were discussed. Data from TEM, TG and BET indicated that there was an obvious agglomeration in the process of modification and that the improvement of dispersive methods of nanosized TiO2 was the key to the improvement of the surface organic modification result. The wetting and dispersivity experiment showed that nanosized TiO2 modified with KH-550 had both hydrophilicity and lipophilicity.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2005年第5期638-642,共5页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金(No.50372028
No.50373019)
江苏高新科技(No.BG2002011)资助项目。
