Theory of electrostriction of liquid-crystalline blue phases I and II.
نویسندگان
چکیده
منابع مشابه
Electrostriction of BPI and BPII for blue phase systems with negative dielectric anisotropy
2014 The deformation of liquid crystalline blue phases BPI and BPII under the influence of a weak electric field is studied for systems with negative dielectric anisotropy. For the initially cubic structures of these materials, the interplanar spacings in the field direction were found to increase or to decrease in the field, depending on the orientation of the unit cell. In this paper, Kossel ...
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Essential change of the splitting between reflections (200) and (i10) with temperature in the Blue Phase I (BPI) transmission spectrum in an electric field has been observed. The electrostriction coefficient ruin in BPI increases anomalously, while approaching the BPIBPII phase transition temperature. These results show that the phase transition is connected with lattice instability with increa...
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Some of the most exotic condensed matter phases, such as twist grain boundary and blue phases in liquid crystals and Abrikosov phases in superconductors, contain arrays of topological defects in their ground state. Comprised of a triangular lattice of double-twist tubes of magnetization, the so-called 'A-phase' in chiral magnets is an example of a thermodynamically stable phase with topological...
متن کاملElectrostriction of the cholesteric blue phases BPI and BPII in mixtures with positive dielectric anisotropy
The electrostriction of the cubic blue phases was investigated in the well known mixture CB15/E9. The results for BPI prove that a decrease of the lattice constant in the field direction with increasing field strength can occur in a system with positive dielectric anisotropy. In agreement with recent theoretical considerations, all components of the electrostriction tensor for this mixture exhi...
متن کاملAnomalies of the temperature dependence of electrostriction in blue phases
We investigated the field-induced Shift of the blue phase diffraction bands. The temperature dependence of the electrostriction tensor components is determined for the first time. In the blue phase BPI at constant field strength E fl [001], a change of the temperture leads to a change of both the unit cell volume and its shape. The deformation of the unit cell displays a pretransitional behavio...
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ورودعنوان ژورنال:
- Physical review. A, Atomic, molecular, and optical physics
دوره 44 4 شماره
صفحات -
تاریخ انتشار 1991