摘要
选择水、乙醇作为助剂,利用六甲基二硅氮烷(HMDS)在气固流化床中对纳米SiO2进行表面改性处理,采用FT-IR、TEM等多种手段表征了HMDS对纳米SiO2的改性效果。水和乙醇的引入能有效提高HMDS对纳米SiO2的改性效果及纳米SiO2的疏水程度,改善其在有机相中的分散性。极性小分子助剂在HMDS改性纳米SiO2中的作用机理分析表明:水可以促进HMDS水解,又可以补充纳米SiO2的表面羟基;乙醇一方面与纳米SiO2发生酯化反应,另一部分作为分散HMDS的溶剂。
Water and ethanol as modifying assistants, silicon dioxide nanoparticles were modified in a fluidized bed reactor by hexamethylidisilazane (HMDS). SiO_2 nanoparticles modified by HMDS were characterized by Fourier transform infrared spectroscopy (FT-IR)、transmission elcetron microscopy (TEM)、carbon content and so on. The results indicate that the polar micromolecules can enhance the hydrophobic ability of SiO_2 nanoparticles modified by HMDS and improve dispersion of SiO_2 in organic solvents. Water can not only accelerate the hydrolyses of HMDS, but also supply the surface silanol groups. Ethanol can not only react with SiO_2, but also be used as a solvent of HMDS.
出处
《华东理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2004年第6期648-652,共5页
Journal of East China University of Science and Technology
基金
国家自然科学基金(20236020
20176009)
上海市基础研究重大项目(04DZ14002)
上海市纳米科技专项基金
教育部<跨世纪优秀人才培养计划>
"十五"国家科技攻关(2001BA310A08)
关键词
纳米SIO2
表面改性
极性小分子
六甲基二硅氮烷
SiO_2 nanoparticles
surface modification
polar micromolecules
hexamethylidisilazane
