极性小分子助剂对六甲基二硅氮烷改性纳米SiO_2的作用机理  

Influence of Polar Micromolecules on SiO_2 Nanoparticles Modified by Hexamethylidisilazane

作　　者：赵映红[1] 李春忠[1] 干路平[1] 丛德滋[1] 

机构地区：[1]华东理工大学材料科学与工程学院超细材料制备与应用教育部重点实验室,上海200237

出　　处：《华东理工大学学报（自然科学版）》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)

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.

关 键 词：纳米SIO2 表面改性 极性小分子 六甲基二硅氮烷 

分 类 号：TQ036[化学工程] O643[理学—物理化学]