Preparation of silica-gel film with pH indicators by the sol-gel method
Preparation of silica-gel film with pH indicators by the sol-gel method
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DOI：
10.1007/s10971-005-5612-7
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发表时间：
2005-02-01
影响因子：
2.5
通讯作者：
Minami, T
中科院分区：
文献类型：
--
作者：
Kowada, Y;Ozeki, T;Minami, T
采用溶胶-凝胶法，无需催化剂，制备了具有各种pH指示剂的凝胶膜。所得凝胶膜作为光学pH传感器对各种pH溶液表现出良好的响应，并且没有观察到指示剂的浸出。凝胶膜中指示剂的吸收光谱特征与水溶液中的吸收光谱特征基本相同。凝胶膜中指示剂的 pKa 随着起始溶液中 TMOS 含量的增加而变化。这些结果表明，凝胶膜中的 pH 指示剂被捕获在与溶液中类似的环境中。
Gel films with various pH indicators were prepared by the sol-gel method without catalysts. The obtained gel films showed good response for various pH solutions as optical pH sensors and no leaching of the indicators was observed. The feature of absorption spectra of the indicators in the gel films was almost the same as that in the aqueous solutions. pKa of the indicators in the gel films was shifted with the increase of the TMOS content in the starting solutions. These results suggest that the pH indicators in the gel films were trapped in similar environment as in the solutions.