硬脂酸对纳米Al_2O_3的有机表面修饰研究  

Organic Modification of Al_2O_3 Nanoparticles with Stearic Acid

作　　者：聂天琛[1] 姚超[1] 李锦春[1] 杨绪杰[2] 陆路德[2] 汪信[2] 

机构地区：[1]江苏工业学院化工系,江苏常州213164 [2]南京理工大学化工学院,江苏南京210094

出　　处：《高校化学工程学报》2008年第4期655-658,共4页Journal of Chemical Engineering of Chinese Universities

基　　金：江苏省科技攻关(BE2006-373);江苏省博士后科研资助计划(0602020B);常州市科技攻关(CE2005016);常州青年科技人才培养计划资助项目(CQ2006-009)

摘　　要：为提高纳米α-Al2O3粒子在有机体系中的分散性和相容性,对纳米α-Al2O3进行了有机表面改性。首先制备了纳米α-Al2O3水分散液,然后把纳米Al2O3水分散液转移到溶有硬脂酸的正丁醇溶液中,升温到一定温度,将纳米Al2O3浆体中的水分蒸馏出去,使纳米Al2O3在有机相中进行表面改性,使得纳米Al2O3有机表面改性和防团聚处理一步完成,得到了团聚程度较小的纳米Al2O3粉体。采用红外光谱(IR)、热分析(TG-DTA)、透射电镜(TEM)、润湿性实验、分散性实验等手段对表面改性前后的纳米Al2O3进行表征。红外光谱和TEM表明,在纳米Al2O3表面包覆有硬脂酸的有机层,并且可能有硬脂酸铝的生成。热分析显示,包覆量约为16.7%。润湿性实验及分散性实验表明,经硬脂酸改性的纳米Al2O3的表面性质由亲水变为疏水。The dispersion and compatibility of α-Al2O3 nanoparticles in organic system were improved by organic surface modificat＇on. Nanosized α-Al2O3 aqueous dispersion was prepared at first and translated into n-butyl alcohol in which stearic acid was dissolved. The water in α-Al2O3 aqueous dispersion was evaporated at certain temperature so that the surface modification was carried out in organic system. The organic surface modification and anti-agglomeration were accomplished in one step, and the powder of α-Al2O3 nanoparticles with low degree agglomeration was gained. The prepared samples were characterized by FT-IR, HRTEM, TG and DTA techniques. According to the spectra of FT-IR and TEM, it was found that the stearic acid is coated on the surface of α-Al2O3 nanoparticles, and the aluminum stearate may be formed. Data from TG-DTA indicate that the mass fraction of stearic acid coated on the surface of α-Al2O3 nanoparticles is about 16.7%. The wetting and dispersity experiments show that the surface property of α-Al2O3 nanoparticles modified by stearic acid is changed from hydrophilicity to hydrophobicity.

关 键 词：纳米AL2O3 硬脂酸 硬脂酸铝:共沸蒸馏 有机表面修饰 

分 类 号：TB383[一般工业技术—材料科学与工程] O614.31[理学—无机化学]