2004/12/10 by J. Stecki, Stecki, J.
Chemistry · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Liquid Crystal Research Advancements #Soft Condensed Matter (cond-mat.soft) #Spectroscopy and Quantum Chemical Studies #Surfactants and Colloidal Systems #cond-mat.soft
paper · pdf · doi:10.48550/arxiv.cond-mat/0412268
no18new.tex +no18new.ps + 11 figures *.ps; v2: improvements in the references
openalex publication_date 2004/12/10 · arxiv created 2006/07/03 · arxiv updated 2009/12/01 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28
Molecular Dynamics simulations of a model bilayer made of surfactant dimers in a Lennard-Jones solvent are reported for three sizes of the systems up to an area of 100σ× 100σ and for a large interval of specific areas:from hole formation under tension to the floppy state of a compressed bilayer. The transition to the floppy state appears quite abrupt and discontinuous; in the floppy state the lateral tension is negative. Lateral tension and the structure factor were determined for all 3 sizes and all areas; the apparent rigidity constant and apparent surface tension are determined and correlated with the specific area and the finite size. The replacement of the 1/q2 capillary-wave divergence by a pole is accounted for and explained. The derivative of the lateral tension jumps from a high value in a flat bilayer to a low value in the floppy, rough, and buckling state, where the tension itself is negative.