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Original Articles

Kritische akustische Relaxationsprozesse in der nematischen Mesophase von 4-n-Hexyloxyphenol-4'-Methoxybenzoat

Pages 43-50 | Received 01 Aug 1986, Accepted 16 May 1987, Published online: 17 Sep 2007
 

Abstract

Ultraschalluntersuchungen an 4-Hexyloxyphenol-4'-Methoxybenzoat bestätigen für diese Verbindung eine kritische Absorption in der nematischen Mesophase. In der untersuchten chemischen Verbindung ist die kritische Absorption von Ultraschallwellen mit der Phasenumwandlung, nematische Mesophase—isotrope Flüssigkeit verbunden. Die charakteristischen Größen für den Prozess der kritischen akustischen Relaxation, Frequenz und Relaxationszeit, wurden errech-net. Sie wurde mit der Frequenz und Relaxationszeit im Fall der dielektrischen Relaxation verglichen. Die Beschreibung der Frequenz und der akustischen Relaxationszeit unter Anwendung von kritischen Exponenten wird beschrieben.

Ultrasound experiments were performed for the nematic mesophase of 4-n-hexyloxyphenyl-4'-methoxybenzoate. These measurements confirm the existence of a critical absorption in this substance. Here the absorption of ultrasound waves is connected with the phase transition from the nematic mesophase to the isotropic liquid. The characteristic quantities, namely frequency and relaxation time for the acoustical relaxation process, were determined. These data are compared to those obtained by the dielectric relaxation method.

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