Comparing Surfactant Structures at "Soft" and "Hard" Hydrophobic Materials: Not All Interfaces Are Equivalent

Langmuir : the ACS Journal of Surfaces and Colloids
Zengyi WeiStuart W Prescott

Abstract

The interfacial structures of a range of amphiphilic molecules are studied with both "soft" and "hard" hydrophobic substrates. Neutron reflection and quartz crystal microbalance with dissipation measurements highlight the differences between the adsorbed structures adopted by sodium dodecyl sulfate (SDS), cetyltrimethylammonium bromide (C16TAB), and the "AM1" surface active peptide. At the soft siloxane/water interface, small molecular surfactants form loosely packed layers, with the hydrophobic tails penetrating into the oily layer, and an area per surfactant molecule that is significantly less than previously reported for the air/water interface. Neutron reflection measurements, supported by quartz crystal microbalance studies, indicate that for C16TAB, approximately 30 ± 8% of the alkyl tail penetrates into the poly(dimethylsiloxane) (PDMS) layer, whereas 20 ± 5% of the alkyl tail of SDS is located in the PDMS. For the engineered peptide surfactant AM1 (21 residues), it was found that one face of the α helix penetrated into the PDMS film. In contrast, penetration of the surfactant tails was not observed against hard solidlike hydrophobic surfaces made from octadecyltrichlorosilane (OTS) for any of the molecular species studi...Continue Reading

References

Dec 4, 2003·Analytical Chemistry·Jessamine Ng LeeGeorge M Whitesides
Apr 10, 2004·Advances in Colloid and Interface Science·Clive A PrestidgeSpomenka Simovic
Apr 10, 2004·Advances in Colloid and Interface Science·Th F TadrosC V Stevens
Apr 10, 2004·Advances in Colloid and Interface Science·Tharwat TadrosC Solans
Dec 1, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Ali ZarbakhshJohn R P Webster
May 23, 2006·Nature Materials·Annette F DexterAnton P J Middelberg
Jun 7, 2007·Journal of the Royal Society, Interface·A P J MiddelbergR K Thomas
Jul 22, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·A ZarbakhshK Wojciechowski
Aug 29, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Lizhong HeAnton P J Middelberg
Mar 23, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Beatrice CattozStuart W Prescott
Jul 17, 2012·The Journal of Physical Chemistry. B·A G Cherstvy, R G Winkler
Dec 12, 2012·ACS Applied Materials & Interfaces·Dipu BorahMichael A Morris
Oct 5, 2013·The Journal of Chemical Physics·Rui Wang, Zhen-Gang Wang
Nov 28, 2013·International Journal of Cosmetic Science·H NazirG Ma
Sep 30, 2014·The Journal of Physical Chemistry. B·Wei BuMark L Schlossman
Mar 21, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Beatrice CattozStuart W Prescott
Jun 21, 2016·Angewandte Chemie·Ernesto ScoppolaOlivier Diat

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Citations

Jan 12, 2021·Journal of Colloid and Interface Science·Finian J AllenStuart M Clarke
Mar 2, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Aurelio Stammitti-Scarpone, Edgar J Acosta
Jun 20, 2020·ACS Applied Materials & Interfaces·Azhad U ChowdhuryBenjamin Doughty

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