Pattern formation and morphology evolution in Langmuir monolayers

The Journal of Physical Chemistry. B
A FloresR Castillo

Abstract

We present a study of how patterns formed by Langmuir monolayer domains of a stable phase, usually solid or liquid condensed, propagate into a metastable one, usually liquid expanded. During this propagation, the interface between the two phases moves as the metastable phase is transformed into the more stable one. The interface becomes unstable and forms patterns as a result of the competition between a chemical potential gradient that destabilizes the interface on one hand and line tension that stabilizes the interface on the other. During domain growth, we found a morphology transition from tip splitting to side branching; doublons were also found. These morphological features were observed with Brewster angle microscopy in three different monolayers at the water/air interface: dioctadecylamine, ethyl palmitate, and ethyl stearate. In addition, we observed the onset of the instability in round domains when an abrupt lateral pressure jump is made on the monolayer. Frequency histograms of unstable wavelengths are consistent with the linear-instability dispersion relation of classical free-boundary models. For the case of dendritic morphologies, we measured the radius of the dendrite tip as a function of the dendrite length as ...Continue Reading

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Citations

Oct 16, 2008·The European Physical Journal. E, Soft Matter·Susheng TanWarren T Ford
Dec 17, 2008·The Journal of Chemical Physics·Guoliang ZhangGerhard Wegner
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Nov 17, 2006·The Journal of Physical Chemistry. B·R M Muruganathan, Th M Fischer

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