Tunable pores in mesoporous silica films studied using a pulsed slow positron beam
Tunable pores in mesoporous silica films studied using a pulsed slow positron beam
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DOI：
10.1016/j.radphyschem.2006.03.036
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发表时间：
2007-02-01
影响因子：
2.9
通讯作者：
Kobayashi, Yoshinori
中科院分区：
文献类型：
--
作者：
He, Chunqing;Muramatsu, Makoto;Kobayashi, Yoshinori
基于脉冲慢正电子束的正电子湮灭寿命谱（PALS）研究了以两亲性PEO-PPO-PEO三嵌段共聚物为结构导向剂合成的介孔二氧化硅膜。孔径大小取决于不同模板的加载。在高分子量共聚物模板的二氧化硅薄膜中形成了较大的孔隙。利用二维PALS，还发现二氧化硅膜的开孔率也受到模板分子量和疏水PPO部分比例的影响。(c) 2006 Elsevier Ltd.版权所有。
Positron annihilation lifetime spectroscopy (PALS) based on a pulsed slow positron beam was applied to study mesoporous silica films, synthesized using amphiphilic PEO-PPO-PEO triblock copolymers as structure-directing agents. The pore size depends on the loading of different templates. Larger pores were formed in silica films templated by copolymers with higher molecular-weights. Using 2-dimensional PALS, open porosity of silica films was also found to be influenced by the molecular-weight as well as the ratio of hydrophobic PPO moiety of the templates. (c) 2006 Elsevier Ltd. All rights reserved.