  This communication reports the surface pressure vs. area per molecule
isotherm and Fluorescence Imaging Microscopic studies of the formation of
domain structure in the mixed Langmuir monolayer of RhB and Stearic acid (SA)
at the air water interface. Strong repulsive interaction between the unlike
components leads to the phase separation and formation of microcrystalline
domains at the air water interface of the Langmuir monolayer. These domain can
be directly visualized using fluorescence imaging microscope.
