Desorbability and reproducibility of chemisorbed water on CaF2

Yasushige Kuroda, Hiroshi Sato, Tetsuo Morimoto

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Desorbability and reproducibility of surface hydroxyls on CaF2, on which the two-dimensional (2D) condensation of water occurs, have been studied by means of various techniques, such as the measurements of water adsorption isotherm, surface water content, heat of immersion, and IR spectra. It was found that the step in the water adsorption isotherm, due to the 2D condensation of water on CaF2, did not appear when the sample was evacuated at 600°C and succeedingly exposed to saturated water vapor at room temperature, but was recovered when it was treated at 600°C and succeedingly immersed in water and partially dissolved. On the other hand, the water content of the sample was very small when the sample was treated at 600°C and succeedingly exposed to saturated water vapor, but it increased when the sample was immersed in water. The heat-of-immersion measurement also showed that surface hydroxyls were reproduced on the dehydroxylated surface of CaF2 when the heat-treated samples were immersed in water. It can be concluded that the surface layers once distorted by a high-temperature treatment is removed by the dissolution, when immersed in water, which brings about the exposure of the ordered surface, and the newly exposed surface is hydroxylated which is effective for the occurrence of the 2D condensation of water.

Original languageEnglish
Pages (from-to)341-346
Number of pages6
JournalJournal of Colloid and Interface Science
Volume108
Issue number2
DOIs
Publication statusPublished - 1985

Fingerprint

Water
water
Condensation
condensation
Steam
Adsorption isotherms
heat
Hydroxyl Radical
Water vapor
Water content
submerging
moisture content
water vapor
isotherms
adsorption
surface water
Surface waters
surface layers
dissolving
Dissolution

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry
  • Surfaces and Interfaces

Cite this

Desorbability and reproducibility of chemisorbed water on CaF2. / Kuroda, Yasushige; Sato, Hiroshi; Morimoto, Tetsuo.

In: Journal of Colloid and Interface Science, Vol. 108, No. 2, 1985, p. 341-346.

Research output: Contribution to journalArticle

Kuroda, Yasushige ; Sato, Hiroshi ; Morimoto, Tetsuo. / Desorbability and reproducibility of chemisorbed water on CaF2. In: Journal of Colloid and Interface Science. 1985 ; Vol. 108, No. 2. pp. 341-346.
@article{c4cf7b2016c24eb68e6d4ad852fe78c2,
title = "Desorbability and reproducibility of chemisorbed water on CaF2",
abstract = "Desorbability and reproducibility of surface hydroxyls on CaF2, on which the two-dimensional (2D) condensation of water occurs, have been studied by means of various techniques, such as the measurements of water adsorption isotherm, surface water content, heat of immersion, and IR spectra. It was found that the step in the water adsorption isotherm, due to the 2D condensation of water on CaF2, did not appear when the sample was evacuated at 600°C and succeedingly exposed to saturated water vapor at room temperature, but was recovered when it was treated at 600°C and succeedingly immersed in water and partially dissolved. On the other hand, the water content of the sample was very small when the sample was treated at 600°C and succeedingly exposed to saturated water vapor, but it increased when the sample was immersed in water. The heat-of-immersion measurement also showed that surface hydroxyls were reproduced on the dehydroxylated surface of CaF2 when the heat-treated samples were immersed in water. It can be concluded that the surface layers once distorted by a high-temperature treatment is removed by the dissolution, when immersed in water, which brings about the exposure of the ordered surface, and the newly exposed surface is hydroxylated which is effective for the occurrence of the 2D condensation of water.",
author = "Yasushige Kuroda and Hiroshi Sato and Tetsuo Morimoto",
year = "1985",
doi = "10.1016/0021-9797(85)90271-1",
language = "English",
volume = "108",
pages = "341--346",
journal = "Journal of Colloid and Interface Science",
issn = "0021-9797",
publisher = "Academic Press Inc.",
number = "2",

}

TY - JOUR

T1 - Desorbability and reproducibility of chemisorbed water on CaF2

AU - Kuroda, Yasushige

AU - Sato, Hiroshi

AU - Morimoto, Tetsuo

PY - 1985

Y1 - 1985

N2 - Desorbability and reproducibility of surface hydroxyls on CaF2, on which the two-dimensional (2D) condensation of water occurs, have been studied by means of various techniques, such as the measurements of water adsorption isotherm, surface water content, heat of immersion, and IR spectra. It was found that the step in the water adsorption isotherm, due to the 2D condensation of water on CaF2, did not appear when the sample was evacuated at 600°C and succeedingly exposed to saturated water vapor at room temperature, but was recovered when it was treated at 600°C and succeedingly immersed in water and partially dissolved. On the other hand, the water content of the sample was very small when the sample was treated at 600°C and succeedingly exposed to saturated water vapor, but it increased when the sample was immersed in water. The heat-of-immersion measurement also showed that surface hydroxyls were reproduced on the dehydroxylated surface of CaF2 when the heat-treated samples were immersed in water. It can be concluded that the surface layers once distorted by a high-temperature treatment is removed by the dissolution, when immersed in water, which brings about the exposure of the ordered surface, and the newly exposed surface is hydroxylated which is effective for the occurrence of the 2D condensation of water.

AB - Desorbability and reproducibility of surface hydroxyls on CaF2, on which the two-dimensional (2D) condensation of water occurs, have been studied by means of various techniques, such as the measurements of water adsorption isotherm, surface water content, heat of immersion, and IR spectra. It was found that the step in the water adsorption isotherm, due to the 2D condensation of water on CaF2, did not appear when the sample was evacuated at 600°C and succeedingly exposed to saturated water vapor at room temperature, but was recovered when it was treated at 600°C and succeedingly immersed in water and partially dissolved. On the other hand, the water content of the sample was very small when the sample was treated at 600°C and succeedingly exposed to saturated water vapor, but it increased when the sample was immersed in water. The heat-of-immersion measurement also showed that surface hydroxyls were reproduced on the dehydroxylated surface of CaF2 when the heat-treated samples were immersed in water. It can be concluded that the surface layers once distorted by a high-temperature treatment is removed by the dissolution, when immersed in water, which brings about the exposure of the ordered surface, and the newly exposed surface is hydroxylated which is effective for the occurrence of the 2D condensation of water.

UR - http://www.scopus.com/inward/record.url?scp=0022230335&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0022230335&partnerID=8YFLogxK

U2 - 10.1016/0021-9797(85)90271-1

DO - 10.1016/0021-9797(85)90271-1

M3 - Article

AN - SCOPUS:0022230335

VL - 108

SP - 341

EP - 346

JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

SN - 0021-9797

IS - 2

ER -