Surface Vibrational Spectroscopic Studies of Hydrogen Bonding and Hydrophobicity

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Science  06 May 1994:
Vol. 264, Issue 5160, pp. 826-828
DOI: 10.1126/science.264.5160.826


Surface vibrational spectroscopy by sum-frequency generation was used to study hydrophobicity at the molecular level at various interfaces: water—surfactant-coated quartz, water-hexane, and water-air. In all cases, hydrophobicity was characterized by the appearance of dangling hydroxyl bonds on 25 percent of the surface water molecules. At the water-quartz interface, packing restrictions force the water surface layer to have a more ordered, ice-like structure. A partly wettable water-quartz interface was also studied.