Adsorption of H2O and Ar on pulverized CaF2

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

doi:10.1021/la00066a008

Adsorption of H₂O and Ar on pulverized CaF₂

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

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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 language	English
Pages (from-to)	679-683
Number of pages	5
Journal	Langmuir
Volume	1
Issue number	6
DOIs	https://doi.org/10.1021/la00066a008
Publication status	Published - Jan 1 1985

ASJC Scopus subject areas

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

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title = "Adsorption of H2O and Ar on pulverized CaF2",

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.",

author = "Yasushige Kuroda and Tohru Takenaka and Junzo Umemura and Shigeharu Kittaka and Kunimitsu Morishige and Tetsuo Morimoto",

year = "1985",

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doi = "10.1021/la00066a008",

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T1 - Adsorption of H2O and Ar on pulverized CaF2

AU - Kuroda, Yasushige

AU - Takenaka, Tohru

AU - Umemura, Junzo

AU - Kittaka, Shigeharu

AU - Morishige, Kunimitsu

AU - Morimoto, Tetsuo

PY - 1985/1/1

Y1 - 1985/1/1

N2 - 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.

AB - 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.

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Adsorption of H₂O and Ar on pulverized CaF₂

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