生物质基纳米二氧化硅的表面改性研究

摘要

The silica white obtained from rice husk ash were hydrophilic,so the silica white had bad compatibility with organic compounds when it was used in organic compounds. In this article ,a new modified method was used to get hydrophobic surface. Debasing reaction was carried out at lower temperature in a mild system to modify silica that is obtained from rice husk ash by hexadecanol in situ and to prepare superhydrophobic silica particles. Surface wettability in inorgic materials can also be controlled by alkyl ’s length. This simple experimental method can be further extended to other inorganic material’s surface modification. In order to study the mechanism of this modification, every reaction condition was studied systematically and a reasonable mechanism was proposed. This method is simple convenient and were very meaningful for other inorganica materials ’surface modification.%成功实现了水相低温条件下稻壳纳米SiO2的表面改性。十六醇与纳米SiO2表面形成化学键合，十六醇的疏水性烷基链朝外排列改变了SiO2表面性质，由亲水表面变为疏水表面。表面改性操作在pH为8~10、90℃水溶液的条件下反应，120℃烘箱中干燥就可以达到。该方法避免了以往使用昂贵的硅烷偶联剂或者在高温有机溶剂环境下进行的缺点，有很好的工业大规模生产的前景。通过对反应条件的考察，提出了二氧化硅和十六醇反应的机理，对目前很多的无机物粉体表面改性机理具有一定的指导意义。