Co-adsorption of peptide amphiphile V(6)K and conventional surfactants SDS and C(12)TAB at the solid/water interface

Soft Matter
Dharana JayawardaneXiubo Zhao

Abstract

Recent research has reported many attractive benefits from short peptide amphiphiles. A practical route for them to enter the real world of applications is through formulation with conventional surfactants. This study reports the co-adsorption of the surfactant-like peptide, V6K, with conventional anionic and cationic surfactants at the solid/water interface. The time-dependant adsorption behaviour was examined using spectroscopic ellipsometry whilst adsorbed layer composition and structural distribution of the components were investigated by neutron reflection with the use of hydrogen/deuterium labelling of the surfactant molecules. Both binary (surfactant/peptide mixtures) and sequential (peptide followed by surfactant) adsorption have been studied. It was found that at the hydrophilic SiO2/water interface, the peptide was able to form a stable, flat, defected bilayer structure however both the structure and adsorbed amount were highly dependent on the initial peptide concentration. This consequently affected surfactant adsorption. In the presence of a pre-adsorbed peptide layer anionic sodium dodecyl sulfate (SDS) could readily co-adsorb at the interface; however, cationic dodecyl trimethyl ammonium bromide (C12TAB) could no...Continue Reading

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Citations

Jul 29, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Dharana JayawardaneXiubo Zhao
Jul 25, 2017·Journal of Colloid and Interface Science·Hongshu ZhangWanguo Hou
Mar 19, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Kang LiuHai Xu
Sep 25, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Fang PanXiubo Zhao

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