Lass, K. and Friedrichs, G. (2011) Revealing structural properties of the marine nanolayer from vibrational sum frequency generation spectra. Journal of Geophysical Research-Oceans, 116 . DOI 10.1029/2010jc006609.

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Abstract

Natural nanolayers originating from sea surface and subsurface water samples collected in the Baltic Sea have been investigated using surface-sensitive vibrational sum frequency generation (VSFG) spectroscopy. Distinct spectral signatures of CH and OH bond stretch vibrations have been detected at wavenumbers ranging from 2700 to 3900 cm(-1). Measured water-air interface spectra as well as observed signal intensity trends are discussed in terms of composition and structure of the natural organic nanolayer. Reasoning was based on the comparison with reference spectra, spectral trends inferred from previous VSFG studies, reported average composition of dissolved organic matter in seawater, and simplified assumption that surfactants can be classified as soluble (wet) and insoluble (dry) surfactants. Wet surfactants have been found to be dominant, and often lipid-like compounds form a very dense surfactant nanolayer. Supported by comparison spectra of xanthan gum solutions, the observed VSFG spectral signatures were tentatively assigned to lipopolysaccharides or other lipid-like compounds embedded in colloidal matrices of polymeric material. In addition, VSFG spectra of a polluted harbor water sample and a water sample covered with diesel oil are reported.

Document Type:	Article
Keywords:	dissolved organic-matter sea-surface microlayer exopolymer particles tep water-molecules chemical-characterization phospholipid monolayers langmuir monolayer charged air/water salt-solutions spectroscopy
Research affiliation:	OceanRep > The Future Ocean - Cluster of Excellence > FO-R07 Kiel University Kiel University > Kiel Marine Science OceanRep > The Future Ocean - Cluster of Excellence
Refereed:	Yes
Open Access Journal?:	No
Publisher:	AGU (American Geophysical Union)
Projects:	Future Ocean
Date Deposited:	01 Nov 2012 05:00
Last Modified:	23 Sep 2019 21:59
URI:	https://oceanrep.geomar.de/id/eprint/17893

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