Adsorption of H2O and Ar on pulverized CaF2

Yasushige Kuroda, Tohru Takenaka, Junzo Umemura, Shigeharu Kittaka, Kunimitsu Morishige, Tetsuo Morimoto

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The chemisorption of H2O on pulverized CaF2 and its surface homogeneity have been investigated by measuring the electron diffraction, the adsorption isotherms of H2O and Ar, the surface H2O content, and the IR spectra. As the result, it was found that pulverized CaF2 has a well-developed (110) plane, and the surface can be hydrated on exposing the pulverized crystal to the atmosphere. Moreover, the homogeneous area for the H2O adsorption, which is estimated from the extent of the sigmoidal jump in the adsorption isotherm, decreases with rising temperature of treatment of the sample, while that for the Ar adsorption estimated from the vertical riser in the adsorption isotherm increases. Rehydration of the surface gives rise to an increase in the homogeneous area for the H2O adsorption, while it causes a decrease in that for the Ar adsorption. The (110) plane exposed by the cleavage of CaF2 exhibits an excellent homogeneity for the Ar adsorption either before or after rehydration, but it is heterogeneous for the H2O adsorption.

Original languageEnglish
Pages (from-to)679-683
Number of pages5
JournalLangmuir
Volume1
Issue number6
DOIs
Publication statusPublished - Jan 1 1985

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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    Kuroda, Y., Takenaka, T., Umemura, J., Kittaka, S., Morishige, K., & Morimoto, T. (1985). Adsorption of H2O and Ar on pulverized CaF2. Langmuir, 1(6), 679-683. https://doi.org/10.1021/la00066a008