Restructuring of Hydrophobic Surfaces Created by Surfactant Adsorption to Mica Surfaces

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Entry by Yuhang Jin, AP225 Fall 2011

Reference

Jhuma Das, Changsun Eun, Susan Perkin, and Max L. Berkowitz, Langmuir, 2011, 27, 11737.

Keywords

Surfactant monolayer, hydrophobic surfaces, long-range electrostatic interaction, molecular dynamics simulation

Introduction

Hydrophobic interaction acting between surfaces is important in many fields and applications. Sometimes this interaction can act over distances as large as ~50 nm, probably due to the existence of submicroscopic bubbles, cavitation in the intervening fluid, or electrostatic interactions between charged patch of restructured hydrophobic surfaces created by surfactant adsorption to mica. Using a surface force balance (SFB), one can measure the interaction between hydrophobic surfaces created by placing ionic surfactants on mica. The interaction sometimes displays a long-ranged hydrophobic component owing to the coexistence of both negatively charged bare mica patches exposed to water and positively charged patches covered by a surfactant bilayer. In this paper, computer simulations confirmed this picture and studied how this restructuring depends on the properties of the surfactant molecules.

Simulations and results

Surfactant 1.jpg