SnO_2水溶胶气-液界面纳米胶粒成膜过程

Study on the Films Forming Process of Nanosized SnO_2 Colloid Particles at the Gas-Liquid Interface

采用胶体化学法制得稳定的SnO_2纳米粒子水溶胶．在LB膜槽内，用膜天平考察了溶胶在陈化和匀速压缩过程中，气—液界面表面压力的变化情况，并用布儒斯特角显微镜（BAM），直接观察了陈化过程中界面胶体粒子的自由密堆积成膜过程，和匀速压缩过程中界面胶体粒子的压缩成膜过程，结果发现，新制（或刮净后）的溶胶表面处于亚稳态，而久置的溶胶表面处于稳定状态，并且溶胶气—液界面的纳米波粒，可通过陈化和压缩，密堆积成固态和类固态膜．

The hydrosol of SnO2 nanoparticles are prepared by the method of colloid chemistry.The free piling up process of nanosized SnO2 colloid particles are investigated at the gas-liquid interface by LB and Brewster Angle Microscopy techniques.The result indicates that solid state monolayer and multilayer of SnO2 nanoparticles can be formed at the gas-liquid interface only by aging the sol in air or compressing it without amphiphiles surfactant.