Tuning porous silica films by various surfactants and loading: A study of positron annihilation Doppler broadening based on a slow positron beam
首发时间:2012-11-01
Abstract:Porous silica films were synthesized via a sol-gel method using a nonionic amphiphilic triblock copolymer (F127) and a cationic surfactant (CTAB) as the structural templates with varying weight ratio. Positron annihilation Doppler broadening spectroscopy based on a slow positron beam was used to study the prepared silica films. For the porous silica films, the S parameter increased gradually with increasing the surfactant loading, which showed that larger pores were introduced in the silica films with more porogen. Distinct difference was observed for the W parameter of the same silica film templated by CTAB after rotating it by 90 around the positron beam axis, indicative of ordered tubal pores aligning along the film surface.
keywords: porous film surfactant positron annihilation
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表面活性剂对多孔二氧化硅薄膜的调制:基于慢正电子束的多普勒展宽谱学研究
摘要:分别以不同含量的非离子两亲性三嵌段共聚物F127和阳离子表面活性剂CTAB为结构模板,通过溶胶-凝胶的方法合成了多孔二氧化硅薄膜。采用基于慢正电子束的正电子湮没多普勒展宽谱学来研究制备的二氧化硅薄膜。多孔二氧化硅薄膜中的S参数随着表面活性剂含量的增加而逐渐增加,表明在更多的表面活性剂下在薄膜中引入了更大的孔。同一多孔二氧化硅薄膜以垂直于正电子束的平面前后旋转90 放置测量时,其W参数明显不同,表明形成了沿着薄膜表面排列的有序管状孔。
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表面活性剂对多孔二氧化硅薄膜的调制:基于慢正电子束的多普勒展宽谱学研究
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