PA12 ネマチック液晶の磁場・電場ダイレクタ振動運動のDNMR観察(2004年日本液晶学会討論会)

概要

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We have investigated the oscillatory behaviour of the nematic director for 8CB when it is subject to a static magnetic field and a sinusoidal electric field. The experimental geometry with the angle between the two fields of 〜90° was used. The director orientation was measured using time-resolved and time-averaged deuterium NMR spectroscopy. The application of a static magnetic field and a sinusoidal electric field at lower frequencies (several Hz to about 1000Hz) to a nematic results in an oscillatory motion of the director between the two fields and in the plane containing them. The oscillations are observed to take place without loss of coherence. That is, at any given time the director is uniformly aligned. The director oscillations and their magnitude are strongly dependent on the frequency of the electric field with the difference in the limiting director orientations being a maximum at low frequencies and tending to zero at high frequencies. These limiting orientations have been observed directly from the time-resolved NMR experiments but we have found that they are also available, more directly, from the time averaged NMR spectrum.
日本液晶学会の論文
2004-09-26