1998 Fiscal Year Final Research Report Summary
Preparation of Intelligent Water Vapor Control Material by Selective Leaching Method
| Project/Area Number |
09450240
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | TOKYO INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
OKADA Kiyoshi Tokyo Institute of Tecnology, Faculty of Engineering, Professor, 工学部, 教授 (80114859)
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| Co-Investigator(Kenkyū-buntansha) |
KAMESHIMA Yoshikazu Tokyo Institute of Technology, Faculty of Engineering, Research associate, 工学部, 助手 (50251616)
HAYASHI Shigeo Akita University, Mining College, Research Institute of Materials and Resources,, 工学資源学部・附属素材資源システム研究施設, 助教授 (20218572)
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| Project Period (FY) |
1997 – 1998
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| Keywords | Vapor control property / Selective leaching / Alumina / Gas adsorption / Silica |
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| Research Abstract |
Preparation of high functional porous materials was investigated by heat treatment and chemical treatment of kaolinite to utilize the wasted kaolinite used abundantly in paper as coating and filler materials. The kaolinite was heat treated to convert into metakaolinite and composite in gamma-alumina and amorphous silica, respectively. They were chemically treated by KOH and H_2SO_4 solutions at various temperatures and times. As a result, porous gamma-alumina was obtained by selective leaching of amorphous silica using KOH solution while porous silica was obtained by selective leaching of alumina using H_2SO_4 solution. The porous properties of the gamma-alumina was as follows ; specific surface area about 300 m^2/g, total pore volume about 0.7 ml/g and pore size about 5-6 nm. The pore size distribution was very sharp. The porous properties of the silica was as follows ; specific surface area about 400 m^2/g, total pore volume about 0.3 ml/g and pore size about 0.6 nm. Since the water vapor adsorption of the gamma-alumina showed steep increase from about 70% of relative humidity and the maximum adsorption was about 600 ml/g, it is considered as a candidate of intelligent vapor control material. On the other hand, since that of the silica showed steep increase from very low relative humidity and the maximum amount of adsorption was 1/3 of that of the gamma-alumina, this porous silica is not suitable as a vapor control material. The important factors to further improve intelligence of vapor control function were discussed on the basis of physical factors of porous properties and also chemical properties by surface modification.
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