Mechanical Vibrations of Smectic Cells Under Fast Field Reversal
作者:
Antal Jákli,
Alfred Saupe,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1995)
卷期:
Volume 263,
issue 1
页码: 103-111
ISSN:1058-725X
年代: 1995
DOI:10.1080/10587259508033574
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
It is known that ferroelectric liquid crystal cells vibrate mechanically under the effect of ac fields. The vibrations are mainly due to the backflow and electroclinic effects. For small director oscillations the effect is mainly linear and goes with the frequency of the field. For larger oscillations higher harmonics appear too. We studied the practically interesting case when, due to rectangular excitation, the director switches fully between two stable positions. In the experiments bookshelf textures of (R)-MHPOBC and FLC6430 (from Hoffmann La Roche) were used. The accelerations of the cover plates due to the reversal of the field were detected in three orthogonal directions. The switches cause strong vibrations of the plates (lasting less than a millisecond,. acceleration ∼10m/s2). The vibration is largest at the SmCα*-Sm A phase transition indicating that the dominating effect is electroclinic in origin.
点击下载:
PDF (501KB)
返 回