Adsorption Isotherm of Water Vapor and Its Large Hysteresis on Highly Ordered Mesoporous Silica |
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| Authors: | Shinji Inagaki Yoshiaki Fukushima Kazuo Kuroda Kazuyuki Kuroda |
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| Institution: | aToyota Central Research & Development Laboratories, Inc. 41-1, Yokomichi, Nagakute-cho, Aichi-gun, 480-11, Japan;bDepartment of Applied Chemistry, Waseda University, Ohkubo-3, Shinjuku-ku, Tokyo, 169, Japan |
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| Abstract: | The first and second adsorption–desorption isotherms of water vapor on a new mesoporous material derived from kanemite have been measured. The isotherms show unusual type V isotherms and large hysteresis. The type V isotherms, which have never been observed for the other adsorbates, suggest that the mesoporous material has a hydrophobic surface, although the hydrophobicity decreased after treatment with water vapor because of rehydration of the surface. The significantly large hysteresis could be explained by the difference in contact angle between adsorption and desorption. |
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| Keywords: | water vapor mesoporous material hydrophobicity hysteresis |
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