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Reference type: Journal
Authors: Amundson KR
Article Title: Imprinting of nematic order at surfaces created by polymerization-induced phase separation.
Publication date: 1998
Journal: Physical Review E
Volume: 58
Issue: (3)
Page numbers: 3273-3279.
DOI: 10.1103/PhysRevE.58.3273

Abstract: Surface interactions of liquid crystals at interfaces are crucial for the performance of devices that use liquid crystals. Many dispersions of polymers and liquid crystals for electro-optic applications are made by polymerization-induced phase separation into a nematic and a polymer gel component. Imprinting of nematic order onto polymer interfaces created in this way was studied. Imprinting renders the interface anisotropic so that the liquid crystal has a preferred In- plane orientation. The interface can be imprinted with nematic order when the polymer network is formed but not after. Also, imprinting survives an excursion through a temperature-driven anchoring transition. These observations argue that imprinting is due not to surface-adsorbed. mesogens, but to an anisotropic arrangement of the polymer network at the interface. Surface imprinting affects electro- optic Properties of polymer-dispersed liquid crystal films in this study and it can be manipulated by an external field during film formation


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