AI Article Synopsis
- The study investigates electroclinic effects in two types of chiral liquid crystals above their phase transition temperatures, revealing how an electric field causes the liquid crystal director to rotate in thin layers.
- The electroclinic coefficient (dθ/dE) near the transition temperature is similar to that found in bulk chiral nematic liquids and in parasmectic phases, indicating comparable responsiveness to electric fields.
- However, the response in the paranematic layers is slower both in temperature variation and relaxation time, with relaxation times over 1000 times slower than in bulk chiral nematic conditions.
Article Abstract
Electroclinic measurements are reported for two chiral liquid crystals above their bulk chiral isotropic-nematic phase transition temperatures. It is found that an applied electric field E induces a rotation θ [∝Ε] of the director in the very thin paranematic layers that are induced by the cell's two planar-aligning substrates. The magnitude of the electroclinic coefficient dθ/dE close to the transition temperature is comparable to that of a bulk chiral nematic, as well as to that of a parasmectic region above a bulk isotropic-to-chiral smectic-A phase. However, dθ/dE in the paranematic layer varies much more slowly with temperature than in the parasmectic phase, and its relaxation time is slower by more than three orders of magnitude than that of the bulk chiral nematic electroclinic effect.
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| http://dx.doi.org/10.1103/PhysRevE.93.022701 | DOI Listing |
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