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| - Shapes of Langmuir Monolayer Domains in Confined Geometries
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| - The shape of two-dimensional liquid expanded droplets of a methyl octadecanoate Langmuir monolayerconfined in gas cavities in a liquid condensed matrix is studied using fluorescence microscopy. Confinementdestabilizes the circular shape by increasing the dipole density of the liquid expanded phase or by decreasingthe bare line tension λ between the liquid expanded and the gaseous phase. Confinement causes a cascade ofshape transitions from a circular droplet toward shapes of n-fold symmetry with increasing n until the dropletreturns to a circle as its size approaches the size of the cavity. The experiments are explained theoretically,and it is shown that the three phase coexistence region is not an equilibrium phase coexistence region. Materialparameters depend on the relative area fraction of the coexisting phases.
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