We study the properties of water molecules adjacent to a hydrophobic molecular layer with vibrational sum-frequency generation spectroscopy. We find that the water molecules at D2O/hexane, D2O/heptane, and D2O/polydimethylsiloxane interfaces show an enhanced ordering and stronger hydrogen-bond interactions than the water molecules at a D2O/air interface. With increasing temperature (up to 80 °C) the water structure becomes significantly less ordered and the hydrogen bonds become weaker.

J. Chem. Phys.
Ultrafast Spectroscopy

Strazdaite, S., Versluis, J., Backus, E., & Bakker, H. (2014). Enhanced ordering of water at hydrophobic surfaces. J. Chem. Phys., 140(5, Article number: 54711), 1–5. doi:10.1063/1.4863558