Evolution of the adsorbed water layer structure on silicon oxide at room temperature

David B. Asay, Seong Kim

Research output: Contribution to journalArticle

418 Citations (Scopus)

Abstract

The molecular configuration of water adsorbed on a hydrophilic silicon oxide surface at room temperature has been determined as a function of relative humidity using attenuated total reflection (ATR)- infrared spectroscopy. A completely hydrogen-bonded icelike network of water grows up to three layers as the relative humidity increases from 0 to 30%. In the relative humidity range of 30-60%, the liquid water structure starts appearing while the icelike structure continues growing to saturation. The total thickness of the adsorbed layer increases only one molecular layer in this humidity range. Above 60% relative humidity, the liquid water configuration grows on top of the icelike layer. This structural evolution indicates that the outermost layer of the adsorbed water molecules undergoes transitions in equilibrium behavior as humidity varies. These transitions determine the shape of the adsorption isotherm curve. The structural transitions of the outermost adsorbed layer are accompanied by interfacial energy changes and explain many phenomena observed only for water adsorption.

Original languageEnglish (US)
Pages (from-to)16760-16763
Number of pages4
JournalJournal of Physical Chemistry B
Volume109
Issue number35
DOIs
StatePublished - Sep 8 2005

Fingerprint

Silicon oxides
silicon oxides
humidity
Atmospheric humidity
Water
room temperature
water
Temperature
adsorption
interfacial energy
Liquids
liquids
configurations
Adsorption isotherms
Interfacial energy
Hydrogen
Infrared spectroscopy
isotherms
infrared spectroscopy
saturation

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

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abstract = "The molecular configuration of water adsorbed on a hydrophilic silicon oxide surface at room temperature has been determined as a function of relative humidity using attenuated total reflection (ATR)- infrared spectroscopy. A completely hydrogen-bonded icelike network of water grows up to three layers as the relative humidity increases from 0 to 30{\%}. In the relative humidity range of 30-60{\%}, the liquid water structure starts appearing while the icelike structure continues growing to saturation. The total thickness of the adsorbed layer increases only one molecular layer in this humidity range. Above 60{\%} relative humidity, the liquid water configuration grows on top of the icelike layer. This structural evolution indicates that the outermost layer of the adsorbed water molecules undergoes transitions in equilibrium behavior as humidity varies. These transitions determine the shape of the adsorption isotherm curve. The structural transitions of the outermost adsorbed layer are accompanied by interfacial energy changes and explain many phenomena observed only for water adsorption.",
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Evolution of the adsorbed water layer structure on silicon oxide at room temperature. / Asay, David B.; Kim, Seong.

In: Journal of Physical Chemistry B, Vol. 109, No. 35, 08.09.2005, p. 16760-16763.

Research output: Contribution to journalArticle

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