Alignment of liquid crystals : on geometrically and chemically modified surfaces
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Nijmegen : Radboud Universiteit Nijmegen
Number of pages
Radboud Universiteit Nijmegen, 5 juli 2013
Promotores : Rasing, T.H.M., Rowan, A.E.
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Spectroscopy of Solids and Interfaces
SubjectSpectroscopy of Solids and Interfaces
This thesis consists of two main parts. The first part describes a new model to explain the complex role of surface materials and surface geometry in the liquid crystal (LC) alignment, which has been a subject of intensive debate over the last 40 years. The second part presents a potentially cost effective and reliable method for compartmentalized LC alignment. LC cells fabricated with this method show superior electro-optical performance compared to conventional LC cells: lower operating voltages, faster switching speeds and no flow-induced dynamic cross-talk between neighboring switching LC domains (molecular orientation interference between neighboring switching LC domains). The pattern symmetry induced multistability that is intrinsic to this method opens new routes for the design and fabrication of multistable LC devices, switchable viewing angle and tunable structures of guest materials within liquid crystal host.
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