The European Physical Journal E

, 24:303

Critical voltages and blocking stresses in nematic gels

Dynamics of director rotation for nematic elastomers under electro-mechanical loads
Regular Article

DOI: 10.1140/epje/i2007-10240-2

Cite this article as:
DeSimone, A., DiCarlo, A. & Teresi, L. Eur. Phys. J. E (2007) 24: 303. doi:10.1140/epje/i2007-10240-2

Abstract.

We present a model of the dynamics of director rotation in nematic gels under combined electro-mechanical loading. Focusing on a model specimen, we describe the critical voltages that must be exceeded to achieve director reorientation, and the blocking stresses that prevent alignment of the nematic director with the applied electric field. The corresponding phase diagram shows that the dynamic thresholds defined above are different from those predicted on the sole basis of energetics. Multistep loading programs are used to explore the energy landscape of our model specimen, showing the existence of multiple local minima under the same voltage and applied stress. This leads us to conclude that hysteresis should be expected in the electro-mechanical response of nematic gels.

PACS.

61.30.Vx Polymer liquid crystals 61.30.Dk Continuum models and theories of liquid crystal structure 61.41.+e Polymers, elastomers, and plastics 78.20.Jq Electrooptical effects 

Copyright information

© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2007

Authors and Affiliations

  1. 1.SISSA-International School for Advanced StudiesTriesteItaly
  2. 2.SMFM-Mathematical Structures of Materials PhysicsUniversità Roma TreItaly