Tuning porosity of silica films by using various surfactants and changing their loading: A study of positron annihilation Doppler broadening based on a slow positron beam

16th International Conference on Positron Annihilation

Xiong, Bangyun^1 ; Mao, Wenfeng^1 ; He, Chunqing^1

Key Laboratory of Nuclear Solid State Physics Hubei Province, School of Physics and Technology, Wuhan University, Wuhan 430072, China^1

关键词: Amphiphilic triblock copolymers;    Porogens;    Porous silica films;    Positron annihilation doppler broadening spectroscopy;    Silica film;    Slow positron beam;    Structural templates;    Weight ratios;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/443/1/012066/pdf
DOI  :  10.1088/1742-6596/443/1/012066

来源: IOP

【 摘 要 】

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 higher porosity was introduced in the silica films with more porogen amount.