Phase Transitions of Soluble Surfactants at a Liquid-Vapor Interface

Details Phase Transitions of Soluble Surfactants at a Liquid-Vapor Interface Phase Transitions of Soluble Surfactants at a Liquid-Vapor Interface

2000-11-10

arxiv.org/abs/cond-mat/0011189v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 8 figures, Figure 1 and 6 (high quality) are availabe by email at Stomass@levdec.engr.ccny.cuny.edu, Submitted to PRL

Scientific paper

Although medium chain length insoluble amphiphiles are well known to form gaseous and liquid expanded phases on an air/water interface, the situation for the soluble case is less clear. We perform molecular dynamics simulations of model surfactant molecules dissolved in a bulk liquid solvent in coexistence with its vapor. Our results indicate a transition in both soluble and insoluble surfactants: a plateau in surface tension vs. surface coverage, whose instantaneous configurations display two phase coexistence, along with correlation functions indicating a transition to gaseous to liquid-like behavior.

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