共沸蒸馏法月桂酸表面修饰纳米氧化铝  

Modification of Alumina Nanoparticles with Lauric Acid by Azeotropic Distillation Method

作　　者：马江权[1] 姚超[1] 张国庆[1] 

机构地区：[1]江苏工业学院化学化工学院,江苏常州213164

出　　处：《精细化工》2009年第8期729-732,737,共5页Fine Chemicals

基　　金：江苏省科技支撑计划(BE2008032);江苏省科技攻关(BE2006045;BE2006373);江苏省教育厅自然科学基金(08KJD430011)资助项目~~

摘　　要：以月桂酸为表面处理剂,采用共沸蒸馏的方法对纳米氧化铝进行了有机表面修饰。采用傅立叶变换红外光谱(FTIR)、热分析(TG-DTG)、高分辨透射电镜(HRTEM)、接触角实验和分散性实验对表面修饰前后的纳米氧化铝进行了分析表征。FTIR,TG-DTG和HRTEM分析表明,纳米氧化铝表面与月桂酸之间可能存在桥连结构的化学键作用。通过无水乙醇洗涤可以除去物理吸附的月桂酸,月桂酸在纳米氧化铝表面形成了均匀的单分子化学修饰层,修饰层的厚度为1～2nm。TG-DTG数据显示,纳米氧化铝表面化学吸附的月桂酸的饱和质量分数约为6.28%。接触角实验和分散性实验说明,经月桂酸修饰的纳米氧化铝的表面由亲水性变为疏水性,有效提高了纳米氧化铝在有机基体中的分散性和相容性。Azeotropic distillation method was applied to the organic surface modification of nanosized alumina using lauric acid as surface treating agent. The prepared samples were characterized by FTIR, TG - DTG, HRTEM, contact angle and dispersivity tests. FTIR, TG - DTG and HRTEM results showed that nanosized alumina may be linked by lauric acid with chemical bonds, and the binding type was bridging binuclear structure. Even the monolayer coverage of lauric acid on the nano-alumina surface was formed by the removal of the physisorbed lauric acid with alcohol washing, and the thickness of coating layer was 1 - 2 nm. Data from TG - DTG indicated that the saturated mass fraction of chemisorptive lauric acid on the surface of alumina nanoparticles was about 6.28%. The contact angle and dispersivity tests revealed that the surface property of alumina nanoparticles modified by lauric acid is changed from hydrophilieity to hydrophobicity. The dispersity and compatibility properties of nanosized alumina in the organic matrix is enchanced after the modification.

关 键 词：纳米氧化铝 月桂酸 表面修饰 共沸蒸馏 功能材料 

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]