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Alignment of Liquid Crystal Confined in Polydimethylsiloxane Channels

The alignment of liquid crystal confined in polydimethylsiloxane channels with a rectangular cross-section is studied. The aspect ratio (depth to the width) of the channel is shown to be a critical parameter. In a channel of aspect ratio less than a critical value the liquid crystal adopts a homeotropic alignment, whereas in a channel with aspect ratio greater than the critical value, the molecules align parallel to the substrate.