Effect of chemisorbed water on the two-dimensional condensation of water and argon on CaF2

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Abstract

The desorbability and regeneration of surface hydroxyls on CaF2, on which the two-dimensional condensation of water occurs, have been investigated by measuring the water adsorption isotherm, the surface water content and the i.r. spectra. Three water desorption peaks were found: A(25-150 °C), B(150-250 °C) and C(250-500 °C). Chemisorbed water exhibiting peaks A and B could be regenerated by exposing the heated surface to water vapour and are responsible for the occurrence of the two-dimensional condensation of water. Chemisorbed water corresponding to peak C could not be reproduced and it is considered to be in inner layers of the crystal. The homogeneous surface responsible for the two-dimensional condensation of water and argon was estimated for samples treated at various temperatures, and it was found that the homogeneous surface for water adsorption decays markedly on heat treatment at 250-500 °C, but recovers to the same extent as the original surface on exposing the surface to water vapour. The homogeneous surface for water adsorption is not homogeneous but heterogeneous for Ar adsorption, and vice versa.

Original languageEnglish
Pages (from-to)757-768
Number of pages12
JournalJournal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
Volume81
Issue number3
DOIs
Publication statusPublished - 1985

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Argon
Condensation
condensation
argon
Water
water
adsorption
Steam
Adsorption
water vapor
surface water
regeneration
Surface waters
Adsorption isotherms
Hydroxyl Radical
Water content
moisture content
Desorption
isotherms
heat treatment

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

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title = "Effect of chemisorbed water on the two-dimensional condensation of water and argon on CaF2",
abstract = "The desorbability and regeneration of surface hydroxyls on CaF2, on which the two-dimensional condensation of water occurs, have been investigated by measuring the water adsorption isotherm, the surface water content and the i.r. spectra. Three water desorption peaks were found: A(25-150 °C), B(150-250 °C) and C(250-500 °C). Chemisorbed water exhibiting peaks A and B could be regenerated by exposing the heated surface to water vapour and are responsible for the occurrence of the two-dimensional condensation of water. Chemisorbed water corresponding to peak C could not be reproduced and it is considered to be in inner layers of the crystal. The homogeneous surface responsible for the two-dimensional condensation of water and argon was estimated for samples treated at various temperatures, and it was found that the homogeneous surface for water adsorption decays markedly on heat treatment at 250-500 °C, but recovers to the same extent as the original surface on exposing the surface to water vapour. The homogeneous surface for water adsorption is not homogeneous but heterogeneous for Ar adsorption, and vice versa.",
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TY - JOUR

T1 - Effect of chemisorbed water on the two-dimensional condensation of water and argon on CaF2

AU - Kuroda, Yasushige

PY - 1985

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N2 - The desorbability and regeneration of surface hydroxyls on CaF2, on which the two-dimensional condensation of water occurs, have been investigated by measuring the water adsorption isotherm, the surface water content and the i.r. spectra. Three water desorption peaks were found: A(25-150 °C), B(150-250 °C) and C(250-500 °C). Chemisorbed water exhibiting peaks A and B could be regenerated by exposing the heated surface to water vapour and are responsible for the occurrence of the two-dimensional condensation of water. Chemisorbed water corresponding to peak C could not be reproduced and it is considered to be in inner layers of the crystal. The homogeneous surface responsible for the two-dimensional condensation of water and argon was estimated for samples treated at various temperatures, and it was found that the homogeneous surface for water adsorption decays markedly on heat treatment at 250-500 °C, but recovers to the same extent as the original surface on exposing the surface to water vapour. The homogeneous surface for water adsorption is not homogeneous but heterogeneous for Ar adsorption, and vice versa.

AB - The desorbability and regeneration of surface hydroxyls on CaF2, on which the two-dimensional condensation of water occurs, have been investigated by measuring the water adsorption isotherm, the surface water content and the i.r. spectra. Three water desorption peaks were found: A(25-150 °C), B(150-250 °C) and C(250-500 °C). Chemisorbed water exhibiting peaks A and B could be regenerated by exposing the heated surface to water vapour and are responsible for the occurrence of the two-dimensional condensation of water. Chemisorbed water corresponding to peak C could not be reproduced and it is considered to be in inner layers of the crystal. The homogeneous surface responsible for the two-dimensional condensation of water and argon was estimated for samples treated at various temperatures, and it was found that the homogeneous surface for water adsorption decays markedly on heat treatment at 250-500 °C, but recovers to the same extent as the original surface on exposing the surface to water vapour. The homogeneous surface for water adsorption is not homogeneous but heterogeneous for Ar adsorption, and vice versa.

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