Why Are Water−Hydrophobic Interfaces Charged? (original) (raw)

ArticleMarch 1, 2008

Why Are Water−Hydrophobic Interfaces Charged?

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[Roberto Car](/action/doSearch?field1=Contrib&text1=Roberto Car)

Journal of the American Chemical Society

Cite this: J. Am. Chem. Soc. 2008, 130, 12

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We report ab initio molecular dynamics simulations of hydroxide and hydronium ions near a hydrophobic interface, indicating that both ions behave like amphiphilic surfactants that stick to a hydrophobic hydrocarbon surface with their hydrophobic side. We show that this behavior originates from the asymmetry of the molecular charge distribution which makes one end of the ions strongly hydrophobic while the other end is even more hydrophilic than the regular water (H2O) molecules. The effect is more pronounced for the hydroxide than for the hydronium. Our results are consistent with several experimental observations and explain why hydrophobic surfaces in contact with water acquire a net negative charge, a phenomenon that has important implications for biology and polymer science.

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