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Substrate-induced gliding in a nematic liquid crystal layer.

E Mema1, L Kondic1, L J Cummings1

  • 1Department of Mathematical Sciences and Center for Applied Mathematics and Statistics, New Jersey Institute of Technology, Newark, New Jersey 07102, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
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Summary

Director gliding in nematic liquid crystals (NLCs) interacting with polymer substrates can cause bistability loss. Frequent external switching may prevent this loss, offering insights for flexible display technologies.

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Area of Science:

  • Materials Science
  • Soft Matter Physics
  • Nanoscience

Background:

  • Nematic liquid crystals (NLCs) are widely used in display technologies.
  • Interactions between NLCs and polymer substrates can lead to slow interfacial orientation changes, termed director gliding.
  • Director gliding impacts the stability and performance of NLC devices.

Purpose of the Study:

  • To model the phenomenon of director gliding between NLCs and polymer substrates.
  • To investigate the consequences of director gliding on the bistability of NLC systems.
  • To explore methods for mitigating bistability loss caused by director gliding.

Main Methods:

  • Development of two theoretical models for director gliding.
  • Analysis of NLC-polymer substrate interactions.
  • Mathematical modeling of bistable NLC systems under gliding conditions.

Main Results:

  • Director gliding can lead to the loss of bistability in NLC systems.
  • Externally imposed switching between steady states can counteract gliding effects.
  • Sufficiently frequent switching can prevent bistability loss, preserving device stability.

Conclusions:

  • Director gliding presents a challenge for NLC device stability, particularly in flexible displays.
  • Dynamic control through external switching offers a potential solution to maintain bistability.
  • Findings are relevant for the design and optimization of next-generation liquid crystal displays.