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Cited by 440

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FT-IR Study of Water Adsorption on Aluminum Oxide Surfaces

Al-Abadleh, Hind A., Grassian, V. H.·2003·Langmuir

Abstract

In this study, transmission FT-IR spectroscopy is used to investigate the adsorption of water on aluminum oxide surfaces, including both single-crystal and particle surfaces. The FT-IR spectra of the (0001) surface of α-Al 2 O 3 single crystals at 296 K in the presence of 0.2 to 20 Torr H 2 O vapor pressure corresponding to 1 to 95% relative humidity (RH) have been measured. The FT-IR spectra are shown to change as a function of RH. At low relative humidity, below approximately 10%, water adsorbs on the surface in an ordered fashion with the formation of a stable hydroxide layer. At intermediate RH, between 10 and 70% RH, water adsorbs molecularly in a structured overlayer. At high RH, greater than 70%, water adsorption is more disordered and consistent with the formation of a liquid-like water layer. The adsorption of nitric acid on α-Al 2 O 3 (0001) prior to water adsorption is shown to only slightly modify the water infrared spectra. A discussion of the quantification of the number of water layers on the α-Al 2 O 3 (0001) surface as a function of RH as well as a comparison of water adsorption on single-crystal α-Al 2 O 3 (0001) to that on α- and γ-Al 2 O 3 powders are presented here.

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Metadata

Authors
Al-Abadleh, H. A., & Grassian, V. H.
Venue
Langmuir
Published
2002-12-21
Volume
19
Issue
2
Pages
341-347
ISSN
  • 0743-7463 (ISSN-L)
  • 1520-5827
OpenAlex
W1984522603
Cited by
440
References
1
FWCI
2.48
Type
journal article
Language
en
Open access
closed

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