Abstract
Infrared absorption spectroscopy m the 1–3 micron region has been employed to investigate the behavior of surface hydroxyl groups and adsorbed water molecules during hydration and dehydration of silica gel. Interpretation of the infrared spectra has provided a general description of the adsorption process and a qualitative picture of the important hydrogen-containing species involved. The presence of (1) non-hydrogen-bonded surface hydroxyl groups, (2) hydroxyl groups hydrogen-bonded to water molecules, (3) monomeric water hydrogen-bonded to surface hydroxyl groups, and (4) clusters of water molecules forming a hydrogen-bonded network has been inferred. The hydrogen bond between surface hydroxyls and water molecules is estimated to be of similar strength to hydrogen bonds in hydrargillite (γ Al(OH) 3). The bonding in the network water appears from the spectra to be similar to that in liquid water. Use of infrared absorption spectroscopy to aid in the interpretation of data obtained by other experimental techniques is discussed.
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