Cholesteric Thermo-reversible Liquid-Crystal Gels: Phase Behaviour and Electro-optical Response

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概要

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• Thermo-reversible gels of a chiral nematic liquid-crystal (LC) with 12-hydroxyoctadecanoic acid (HOA) were cast in a light-reflecting planar configuration by choosing a processing temperature higher than the sol–gel temperature but lower than the onset-temperature for the chiral nematic-isotropic transition in the gel. The choice of processing temperature is dictated by the quasi-ternary phase diagram of the system, which displays a 3-phase region at which an isotropic liquid is in equilibrium with a fibrillar solid and a chiral nematic mesophase. Planar configurations of the gels produced show a significant broadening of the reflection band with respect to the neat LC-material indicating a distribution of the cholesteric pitch within the gel. Visco-elasticity, electro-optical activity and zero electric field bistability of gelled films has been utilized in building a reflective bistable chiral nematic cell with improved shock-resistance that holds the promise of being produced via a continuous processing route.

• 2001-04-15

著者

• Janssen Rob

  Department Of Chemical Engineering Eindhoven University Of Technology

• Smith Paul

  Department Of Materials

• TERVOORT Theo

  Department of Materials

• Broer Dirk

  Department Of Chemical Engineering Eindhoven University Of Technology

• Picken Stephen

  Department Of Materials Science And Technology Polymer Materials And Engineering Group Delft Univers

• Bastiaansen Cees

  Department Of Chemical Engineering Eindhoven University Of Technology

• Teunissen Jean-pierre

  Department Of Chemical Engineering Eindhoven University Of Technology

• Broer Dirk

  Department of Chemical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

• Bastiaansen Cees

  Department of Chemical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

• Smith Paul

  Department of Materials, ETH-Zentrum UNO C15, CH-8092 Zürich, Switzerland

• Teunissen Jean-Pierre

  Department of Chemical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

• Janssen Rob

  Department of Chemical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

• Picken Stephen

  Department of Materials Science and Technology, Polymer Materials and Engineering Group, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands

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• Cholesteric Thermo-reversible Liquid-Crystal Gels: Phase Behaviour and Electro-optical Response

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