Tip-induced orientational order of surfactant micelles on gold

Langmuir : the ACS Journal of Surfaces and Colloids
Hannes C SchnieppIlhan A Aksay

Abstract

Using liquid-cell atomic force microscopy, we investigate aqueous solutions of alkyltrimethylammonium halide surfactants at the Au111 surface. The long, micellar surfactant surface aggregates cover the gold surface completely and exhibit two types of orientational order for chloride and bromide counterions, respectively. We observe lateral forces perpendicular to the scanning direction, which we explain by anisotropic friction between the probe and the oriented micelles. Conversely, we show that these friction forces can be employed to modify the spatial conformation of the micellar adlayer. Where previous methods have failed to provide control over the orientation down to the level of individual micelles, we use this technique to achieve a very high degree of order over more than 100 micelle diameters.

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Citations

Dec 5, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Caroline M MuriraIlhan A Aksay
Jan 30, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Patrick Kékicheff, Christophe Contal
May 29, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·J J HamonBrian P Grady

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