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Flow-controlled growth in Langmuir monolayers |
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| Authors: | R. Bruinsma F. Rondelez A. Levine |
| Affiliation: | (1) Physics Department, University of California, Los Angeles, CA, 90024, USA and Instituut Lorentz voor Theoretische Natuurkunde, Universiteit Leiden, Postbus 9506, 2300 Leiden, The Netherlands, NL;(2) Laboratoire de Physico-Chimie Curie, Institut Curie, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, France, FR;(3) Department of Chemical Engineering, University of California, Santa Barbara, CA, 93106, USA, US |
| Abstract: | We propose a hydrodynamic mechanism, based on the Marangoni flow, to describe growth instabilities of liquid-condensed islands in the supercooled liquid-expanded phase of two-dimensional Langmuir monolayers. This Marangoni instability is intrinsic to Langmuir monolayers and is not controlled by the expulsion of chemical impurities from the liquid-condensed phase. The hydrodynamic transport of the insoluble surfactants is shown to overwhelm passive diffusion and to provide a mechanism for fingering instabilities. The model can explain the observations by Brewster-angle microscopy of ramified liquid-condensed islands in monolayers that do not contain the fluorescent dye impurities, which are normally believed to be responsible for Langmuir-film growth instabilities. Received 21 May 2000 and Received in final form 18 June 2001 |
| Keywords: | PACS. 05.70.Np Interface and surface thermodynamics – 68.18.Jk Phase transitions – 47.20.Dr Surface-tension-driven instability |
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