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Study of the adsorption of sodium dodecyl sulphate (SDS) at the air/water interface: Targeting the sulphate headgroup using vibrational sum frequency spectroscopy
YKI – Ytkemiska institutet.
2005 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 7, 2635-2640 p.Article in journal (Refereed)
Abstract [en]

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-C-3 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

Place, publisher, year, edition, pages
2005. Vol. 7, 2635-2640 p.
Keyword [en]
Air-water-interface, external reflection spectroscopy, liquid-gas interface, surface-tension, sulfate/dodecanol mixtures, Molecular-orientation, adsorbed monolayers, neutron reflection, ionic surfactants, Raman-scattering
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27364OAI: oai:DiVA.org:ri-27364DiVA: diva2:1054368
Note
A1747Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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