Issue 13, 2005
From the journal:

Physical Chemistry Chemical Physics

Study of the adsorption of sodium dodecyl sulfate (SDS) at the air/water interface: targeting the sulfate headgroup using vibrational sum frequency spectroscopy

C. Magnus Johnsona  and  Eric Tyrode*bc  

* Corresponding authors

a Division of Corrosion Science, Royal Institute of Technology, Drottning Kristinas Väg 51, Stockholm, Sweden

b Department of Chemistry, Surface Chemistry, Royal Institute of Technology, Drottning Kristinas Väg 51, Stockholm, Sweden
E-mail: eric.tyrode@surfchem.kth.se
Fax: +46 8 208998
Tel: +46 8 7909916

c YKI, Institute for Surface Chemistry, Stockholm, Sweden

Abstract

The surface sensitive technique vibrational sum frequency spectroscopy (VSFS), has been used to study the adsorption behaviour of SDS to the liquid/vapour interface of aqueous solutions, specifically targeting the sulfate headgroup stretches. In the spectral region extending from 980 to 1850 cm−1, only the vibrations due to the SO3 group were detectable. The fitted amplitudes for the symmetric SO3 stretch observed at 1070 cm−1 for the polarization combinations ssp and ppp, were seen to follow the adsorption isotherm calculated from surface tension measurements. The orientation of the sulfate headgroup in the concentration range spanning from 1.0 mM to above the critical micellar concentration (c.m.c.) was observed to remain constant within experimental error, with the pseudo-C3 axis close to the surface normal. Furthermore, the effect of increasing amounts of sodium chloride at SDS concentrations above c.m.c. was also studied, showing an increase of approximately 12% in the fitted amplitude for the symmetric SO3 stretch when increasing the ionic strength from 0 to 300 mM NaCl. Interestingly, the orientation of the SDS headgroup was also observed to remain constant within this concentration range and identical to the case without NaCl.

Graphical abstract: Study of the adsorption of sodium dodecyl sulfate (SDS) at the air/water interface: targeting the sulfate headgroup using vibrational sum frequency spectroscopy

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Article information

DOI
https://doi.org/10.1039/B505219J
Article type
Paper
Submitted
13 Apr 2005
Accepted
19 May 2005
First published
01 Jun 2005

Phys. Chem. Chem. Phys., 2005,7, 2635-2640

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Study of the adsorption of sodium dodecyl sulfate (SDS) at the air/water interface: targeting the sulfate headgroup using vibrational sum frequency spectroscopy

C. M. Johnson and E. Tyrode, Phys. Chem. Chem. Phys., 2005, 7, 2635 DOI: 10.1039/B505219J

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