氧化铝溶胶的制备及表征

Preparation and characterization of alumina sol

采用溶胶-凝胶法制备了Al2O3溶胶,其粒径为58.6nm,Zeta电位为61.8mV,在激光照射下呈现丁达尔效应。通过研究Al2O3溶胶的粒径、Zeta电位和稳定性得出了制备稳定透明的Al2O3溶胶的最佳制备条件:PEG-400(分散剂)浓度为1%,AlCl3溶液的浓度为2 mol/L,沉淀温度为90℃,酸铝比0.2,并对其胶体结构的形成机理进行了讨论。利用Al2O3溶胶带正电荷的特性,可与带负电荷的纳米纤维素一起交替沉积于锂离子电池隔膜表面,形成涂层,从而改善电池隔膜的性能。

Al2O3 sol was prepared by sol-gel method,with particle diameter of 58.6nm and Zeta potential of 61.8mV.By studying the particle size,Zeta potential and stability of Al2O3 sol,the optimum preparation conditions for stable Al2O3 sol were obtained,namely,PEG-400 dosage 1%,AlCl3 concentration 2 mol/L,precipitation temperature 90℃ and the ratio of aluminum to acid 0.2.In addition,the formation mechanism of its colloidal structure was discussed.In order to improve the performance of lithium ion electron separator,the positive-charge characteristics of Al2O3 sol can be used to fabricate coated electron separator,by alternatively precipitating Al2O3 particles and negative-charged nanocellulose.