Flow-controlled growth in Langmuir monolayers |
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| Authors: | R Bruinsma F Rondelez A Levine |
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| Institution: | (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 |
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| 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 |
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| 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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