Ultrasonic Studies of Some Nematic Liquid Crystals
The ultrasonic velocity and absorption of three nematic liquid crystals 1. N-(p-hexyloxybenzalidene)- p-toluidine (HT), 2. N-(p-octyloxybenzalidene)-p-toluidine, and 3. (p-ethoxybenzalidine)- p-n-butylaniline were measured both in isotropic liquid and liquid crystalline ranges. The velocity was measured by the interferometric technique and absorption was measured by the pulse technique. An anomalous increase in absorption and decrease in sound velocity was observed in the vicinity of the isotropic-nematic transition. In OBT the smectic-nematic transition was marked only by a change of slope in velocity. The results are qualitatively discussed in the light of present theories. A short review of the present theories of ultrasonic velocity and absorption is also given.
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Document Type: Research Article
Publication date: September 1, 1975
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- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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