Sum frequency vibrational spectroscopy of leucine molecules adsorbed at air-water interface.

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The Journal of Chemical Physics. 2004 Apr 15;120(15):7107-12. doi: 10.1063/1.1669375

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Ji N, Shen Y

Note: Research in this publication was not performed at Janelia.

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Abstract

Sum frequency vibrational spectroscopy was used to study adsorption of leucine molecules at air-water interface from solutions with different concentrations and pH values. The surface density and the orientation of the isopropyl head group of the adsorbed leucine molecules could be deduced from the measurements. It was found that the orientation depends on the surface density, but only weakly on bulk pH value at the saturated surface density. The vibrational spectra of the interfacial water molecules appeared to be strongly affected by the charge state of the adsorbed leucine molecules. Enhancement and inversion of polar orientation of interfacial water molecules by surface charges or field controllable by the bulk pH value were observed.

PMID: 15267614 [PubMed - indexed for MEDLINE]

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Sum frequency vibrational spectroscopy of leucine molecules adsorbed at air-water interface.

Note: Research in this publication was not performed at Janelia.

Abstract

PMID: 15267614 [PubMed - indexed for MEDLINE]

Janelia Authors