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Related Experiment Videos

Memory effects in nematics with quenched disorder.

M Buscaglia1, T Bellini, C Chiccoli

  • 1Dipartimento di Chimica, Biochimica e Biotecnologie per la Medicina, Università di Milano, Via F.lli Cervi 93, 20090 Segrate (MI), Italy.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 16, 2006
PubMed
Summary

Quenched disorder in nematic liquid crystals creates memory effects. Applied fields during the transition induce permanent alignment, even at low strengths, influencing the material's future behavior.

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Area of Science:

  • Physics
  • Materials Science

Background:

  • Nematic liquid crystals exhibit unique phase transitions.
  • Quenched disorder can significantly influence material properties.
  • Understanding memory effects in condensed matter is crucial.

Purpose of the Study:

  • To investigate the impact of quenched disorder on nematic liquid crystal behavior.
  • To explore the induction of permanent alignment in nematics using external fields.
  • To analyze the role of sample history and transition conditions on nematic memory.

Main Methods:

  • Experimental measurement of turbidity in a nematic liquid crystal embedded in a porous polymer membrane.
  • Monte Carlo simulations of the Lebwohl-Lasher spin model with quenched disorder.
  • Application of varying electric fields during the isotropic to nematic transition.

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Main Results:

  • A permanent alignment of the nematic phase was observed with fields as low as 0.1 V/microm.
  • Sample history (field-cooled vs. zero-field-cooled) significantly impacted the nematic alignment.
  • Simulations confirmed memory effects in a disordered spin model, analogous to experimental findings.
  • Nematic memory is imprinted during the transition via field interaction with orienting nuclei.

Conclusions:

  • Dilute quenched disorder is sufficient to induce significant memory effects in nematic liquid crystals.
  • The observed memory arises from the interaction of applied fields with nematic nuclei during the phase transition.
  • Permanent nematic textures are formed at lower temperatures through interaction with quenched disorder.