Optically isotropic liquid-crystal phase of bent-core molecules with polar nanostructure.

Authors:
Strahinja Stojadinovic, Ph.D.
Strahinja Stojadinovic, Ph.D.
UT Southwestern Medical Center
Associate Professor
Medical Physics
Dallas, TX | United States

Phys Rev E Stat Nonlin Soft Matter Phys 2005 Aug 30;72(2 Pt 1):021710. Epub 2005 Aug 30.

Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA.

We found that the optically isotropic (I(M)) mesophase observed recently below the nematic phase of the bent-core liquid crystal 4-chlororesorcinol bis[4-(4-n-dodecyloxybenzoyloxy)benzoate] shows ferroelectric-type switching. Polarizing microscopic, electric current, dielectric, and dynamic light scattering studies lead us to propose that the I(M) phase is composed of interconnected orthoconic racemic smectic (Sm-Ca P(F)) nanodomains with random layer orientations. Near the nematic phase, where the polarization can be saturated by electric fields, the system responds in a fashion analogous to the granular structure of a magnetic spin glass--in particular, we observed that the relaxation back to the nonpoled structure follows a similar, inverse logarithmic rule.

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http://dx.doi.org/10.1103/PhysRevE.72.021710DOI Listing
August 2005
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