Journal
LANGMUIR
Volume 26, Issue 21, Pages 16397-16400Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la1020737
Keywords
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Funding
- Centre for Oil Sands Innovation (COSI)
- Natural Sciences and Engineering Research Council of Canada (NSERC)
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The adsorption of water at solvent/silica interfaces was studied using IR-visible sum frequency generation (SFG) vibrational spectroscopy. We discovered a water layer between toluene and silica with no detectable free OHs. The water layer without free OHs showed resistance against further adsorption of water molecules. This water-resistant water surface was very stable at room temperature and did not become a regular water layer with free OH over a period of 12 h in water-saturated toluene. However, this special structure of water was not observed at heptane/silica interfaces, at which free OHs were observed. The study indicates that interactions between solvents and water molecules can significantly change the interfacial water properties.
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