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Tuning porous silica films by various surfactants and loading: A study of positron annihilation Doppler broadening based on a slow positron beam
XIONG Bangyun 1,MAO Wenfeng 2,HE Chunqing 2 * #
1.Key Laboratory of Nuclear Solid State Physics Hubei Province, School of Physics and Technology, Wuhan University, WuHan 430072
2.Key Laboratory of Nuclear Solid State Physics Hubei Province, School of Physics and Technology, Wuhan University, Wuhan 430072
*Correspondence author
#Submitted by
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Funding: Wuhan University Research Fund(No.No. 1081004), Specialized Research Fund for the Doctoral Program of Higher Education of China(No.No. 20090141120069), the Fundamental Research Funds for the Central Universities(No.No. 2012202020218), National Natural Science Foundation of China (No.No. 10975108 & 10974149)
Opened online: 1 November 2012
Accepted by: none
Citation: 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]. [ 1 November 2012] http://en.paper.edu.cn/en_releasepaper/content/4492969
 
 
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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