Electro-Mechanical Fredericks Effects in Nematic Gels

Details Electro-Mechanical Fredericks Effects in Nematic Gels Electro-Mechanical Fredericks Effects in Nematic Gels

1998-11-13

arxiv.org/abs/cond-mat/9811198v2

Physics

Condensed Matter

Soft Condensed Matter

Latex (revtex style), 5 EPS figures, submitted to PRE, corrections to discussion of fig.3, cosmetic changes

Scientific paper

10.1103/PhysRevE.60.1872

The solid nematic equivalent of the Fredericks transition is found to depend on a critical field rather than a critical voltage as in the classical case. This arises because director anchoring is principally to the solid rubbery matrix of the nematic gel rather than to the sample surfaces. Moreover, above the threshold field, we find a competition between quartic (soft) and conventional harmonic elasticity which dictates the director response. By including a small degree of initial director misorientation, the calculated field variation of optical anisotropy agrees well with the conoscopy measurements of Chang et al (Phys.Rev.E56, 595, 1997) of the electro-optical response of nematic gels.

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