旋涂法快速制备双层二元胶体微球有序薄膜

以较大粒径的聚苯乙烯或SiO₂胶体微球的单层有序薄膜作基膜，较小粒径的SiO₂微球作第二层，用分步旋涂法快速制备了二元双层胶体微球复合有序薄膜.膜中小粒径微球与大粒径微球的粒径比γ=020—056，大粒径与小粒径微球的排列方式可表示为LS_x（x=1，2，…，13）.旋涂速度、旋涂时间、微球悬浮介质的黏度、悬浮液中微球的数密度、旋涂衬底的可润湿性等因素均会影响旋涂组装胶粒薄膜的质量.在旋涂衬底能够被胶体微球悬浮介质完全润湿的前提下，适宜的胶体微球数密度、旋涂速度、旋涂时间是旋涂组装有序薄膜的必要条件. 关键词： 复合有序薄膜 分步旋涂 胶体微球模板

Rapid fabrication of crystalline films with double layers and dual members by spin-coating method

Ordered colloidal particle films with double layers and dual members could be prepared by step by step spin coating method. Monolayer film of larger sized PS or SiO₂ colloids was utilized as template to self assemble second layer of SiO₂ colloidal particles with smaller diameter. The size ratio γ of smaller and larger colloidal particles was 0.20—0.56 in the composite films. Larger （L） and smaller （S） dual member colloidal particles formed composite crystalline double layer films with multifarious array modes, whose structures could be expressed as LS_x （here, L represents larger sized particles, S represents smaller colloidal particles, and x represents the stoichiometry of larger and smaller colloidal particles）, and x=1, 2, …, 13. The performance of composite colloidal films were influenced mainly by several factors, including spin coating velocity, spin coating time, viscosity of suspension medium, number density of colloidal suspension, and the wetting properties of substrates, etc.. On the prerequisite of complete wetting between colloidal suspension and substrate, appropriate number density of colloidal suspension, velocity and time of spin coating were the necessary conditions for ordered self assembling to crystalline film of colloidal particles by spin coating method.