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A vibrational sum frequency spectroscopy study of the liquid-gas interface of acetic acid-water mixtures: 2. Orientation analysis
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2005 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 109, 329-341 p.Article in journal (Refereed)
Abstract [en]

Vibrational sum frequency spectroscopy has been used to investigate the surface of aqueous acetic acid solutions. By studying the methyl and carbonyl vibrations with different polarization combinations, an orientation analysis of the acetic acid molecules has been performed in the concentration range 0-100%. The surface tension of acetic acid solutions was also measured in order to obtain the surface concentration. The orientation of the interfacial acetic acid molecules was found to remain essentially constant in an upright position with the methyl group directed toward the gas phase in the whole concentration range. The tilt angle (CH3) of the symmetry axis of the methyl group with respect to the surface normal was found to be lower than 15 when considering a distribution of angles or as narrow as 0 ± 11 when assuming a Gaussian distribution. Further investigations showed that the C=O bond tilt (C=O) of the acetic acid hydrated monomer was constant and close to 55 in the concentration range where it was detected. Finally, the orientation information is discussed in terms of different species of acetic acid, where the formation of a surface layer of acetic acid cyclic dimers is proposed at high acid concentrations.

Place, publisher, year, edition, pages
2005. Vol. 109, 329-341 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26930OAI: oai:DiVA.org:ri-26930DiVA: diva2:1053933
Note
A1744Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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YKI – Ytkemiska institutet
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