Effect of gamma radiation on silica gel. III. Dependence of hydrogen adsorbed and color center formation on aluminum contents.:Dependence of Hydrogen Adsorbed and Color Center Formation on Aluminum Contents
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概要
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The γ-irradiation of silica gel degassed for 24 h above 400°C produces visible color center (λ<SUB>max</SUB>=530 nm). The color center instantly disappears on exposure to H<SUB>2</SUB> at room temperature and irreversible adsorption of H<SUB>2</SUB> is concurrently observed. On the basis that color center is attributed to the positive hole due to substitutional impurity of Al in silica matrix, the yield of color center and H<SUB>2</SUB> adsorption have been investigated as a function of Al content in silica gel deliberatly prepared by us from silicon tetrachloride to contain Al in the range of 10<SUP>-3</SUP>5W/O. Absorbance at 530 nm, <I>A</I><SUB>530</SUB>, due to color center as well as the amount of H<SUB>2</SUB> adsorbed, (H<SUB>2</SUB>) ads, increase with the Al content in the matrix. <I>A</I><SUB>530</SUB>/(H<SUB>2</SUB>)ads is 1.0×10<SUP>6</SUP> (0.D. unit g/mol) in these gels. This ratio is seen almost same with two samples of gel commercially available.<BR>By assuming that 1 mol of H<SUB>2</SUB> reacts with 2 mol of positive hole, the extinction co-efficient of color center at 530 nm is evaluated as 10×10<SUP>6</SUP> (g/mol•cm).
- 一般社団法人 日本原子力学会の論文
著者
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Sawai Takeshi
Tokyo Metropolitan Isotope Research Center
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KONDO Masaharu
Department of Chemistry, Faculty of Science, Tokyo Metropolitan University
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OGURA Hajime
Department of Chemistry, Faculty of Science, Tokyo Metropolitan University
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NAKAZATO Chiyoko
Department of Chemistry, Faculty of Science, Tokyo Metropolitan University
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SAWAI Teruko
Tokyo Metropolitan Isotope Research Center
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