Strength and elasticity of bimodal porous silica prepared from water glass |
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Authors: | Naoki Shinozaki Ryoji Takahashi Satoshi Sato Toshiaki Sodesawa |
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Institution: | (1) Department of Applied Chemistry, Faculty of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba-shi 263-8522, Japan;(2) Present address: Graduate School of Science and Engineering, Ehime University, 2-5, Bunkyo-cho, Matsuyama-shi 790-8577, Japan |
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Abstract: | The bending strength and the Young’s modulus of bimodal porous silica gels having different porosity were evaluated. The porosity
of the gel increased by aging the gel under basic conditions, and decreased with increasing the calcination temperature. The
mesopores disappeared on calcination at 1,050 °C, whereas continuous macropores retained their morphology up to 1,050 °C for
all the samples. Both the bending strength and the Young’s modulus of the bimodal porous silica gels were expressed as power-law
functions of the bulk density, and no effect of bimodal pore structures on mechanical properties was observed. We also found
linear correlation between the bending strength and the elasticity. The bimodal porous silica had higher strength and elastic
modulus compared with other porous materials at the same porosity probably due to the presence of homogeneous micrometer-scale
macropores. |
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Keywords: | Bimodal pore structure Bending strength Elastic modulus Silica gel |
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