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Langmuir, Vol.14, No.8, 1945-1950, 1998
Polymer-dispersed liquid crystal films studied by near-field scanning optical microscopy
Topographic and near-field scanning optical microscopy images of nematic liquid crystalline (LC) droplets dispersed in polymer films are presented. It is conclusively shown that the topographic images provide information invaluable to a complete understanding of the droplet formation process, shape, and internal LC organization. The topographic data indicate that the droplets are encapsulated in a thin, relatively solid polymer shell. Many droplets in these films are observed to take on spheroidal and discoidal shapes. A new class of toroidal droplets, possibly formed by droplet rupture during film formation, is also observed and characterized. Polarization-dependent optical images are employed to determine the LC organization in these droplets.