# Protein and ionic surfactants - promoters and inhibitors of contact line pinning

## TL;DR

This paper investigates how different surfactants, specifically lysozyme and lauryl sulfate, influence the pinning of a drop's contact line, revealing that proteins promote and surfactants inhibit pinning through wetting behavior differences.

## Contribution

It introduces a novel understanding of how proteins and surfactants differently affect contact line pinning based on wetting properties.

## Key findings

- Lysozyme promotes contact line pinning.
- Lauryl sulfate inhibits contact line pinning.
- Wetting behavior explains the disparity in pinning effects.

## Abstract

We report a new effect of surfactants in pinning a drop contact line, specifically that lysozyme promotes while lauryl sulfate inhibits pinning. We explain the pinning disparity assuming difference in wetting: the protein-laden drop wets a "clean" surface and the surfactant-laden drop wets an auto-precursored surface.

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Source: https://tomesphere.com/paper/0704.0434