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Molecular structure and adsorption of dimethyl sulfoxide at the air/aqueous solution interface probed by non-resonant second harmonic generation

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Abstract

In this study, non-resonant second harmonic generation (SHG) was used to investigate the molecular structure and adsorption of DMSO at the air/neat DMSO liquid and air/DMSO aqueous solution interfaces. The molecular orientation of interfacial DMSO as a function of the bulk DMSO concentration was investigated by quantitative polarization SHG analysis. For the air/neat DMSO liquid interface, the transition dipole moment of the S[double bond, length as m-dash]O group of DMSO is oriented 140° from the surface normal, where the S[double bond, length as m-dash]O group of DMSO is estimated to be 30° from the surface plane. The orientation of the S[double bond, length as m-dash]O group of interfacial DMSO is not dependent on the bulk DMSO concentration. Furthermore, the concentration-dependent SHG signal confirmed that the antiparallel double layer structure does not form at the air/DMSO water interface. The free energy of adsorption of DMSO at the air/DMSO aqueous solution interface was determined to be ΔGads = −5.6 ± 0.4 kJ mol−1.

Graphical abstract: Molecular structure and adsorption of dimethyl sulfoxide at the air/aqueous solution interface probed by non-resonant second harmonic generation

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Publication details

The article was received on 05 Jan 2018, accepted on 26 Mar 2018 and first published on 27 Mar 2018


Article type: Paper
DOI: 10.1039/C8CP00099A
Citation: Phys. Chem. Chem. Phys., 2018, Advance Article
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    Molecular structure and adsorption of dimethyl sulfoxide at the air/aqueous solution interface probed by non-resonant second harmonic generation

    Q. Wei, D. Zhou and H. Bian, Phys. Chem. Chem. Phys., 2018, Advance Article , DOI: 10.1039/C8CP00099A

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