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1. Tuning porous silica films by various surfactants and loading: A study of positron annihilation Doppler broadening based on a slow positron beam | |||
XIONG Bangyun,MAO Wenfeng,HE Chunqing | |||
Nuclear Science and Technology 25 October 2012 | |||
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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. | |||
TO cite this article:XIONG Bangyun,MAO Wenfeng,HE Chunqing. Tuning porous silica films by various surfactants and loading: A study of positron annihilation Doppler broadening based on a slow positron beam[OL].[25 October 2012] http://en.paper.edu.cn/en_releasepaper/content/4492969 |
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