Model calculation of sepiolite surface areas

Toshiyuki Hibino, Atsumu Tsunashima, Atsushi Yamazaki, Ryohei Otsuka

研究成果: Article査読

41 被引用数 (Scopus)


In general, the N2-BET surface areas of sepiolite samples range from 95 to 400 m2/g depending on deposits. The surface areas of five sepiolites, all varying in crystallite size, were measured on heating, and were compared with a model calculation. A sharp decrease in the surface area, due to crystal folding, was observed between 200° and 400°C. Both before and after the folding, each sepiolite sample had peculiar values. Our model sufficiently explains this difference in surface areas among the samples. In the model, which is based on the Brauner-Preisinger structural model, surface area is a function of the crystallite size and the ratios of the coverage for nitrogen adsorption on both the internal and external surfaces. These ratios of the coverage can be inversely estimated from the model. The ratios of the coverage on the internal surface are less than 0.19, and that on the external surface between 0.7 and 1.0

ジャーナルClays and Clay Minerals
出版ステータスPublished - 1995 8月

ASJC Scopus subject areas

  • 水の科学と技術
  • 土壌科学
  • 地球化学および岩石学
  • 地球惑星科学(その他)


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