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Static and Dynamic Dielectric Properties of Mesogenic n-Nonyloxycyanobiphenyl (9OCB)

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Static and Dynamic Dielectric Properties of Mesogenic n -Nonyloxycyanobiphenyl (9OCB)

Grzegorz Czechowski and Jan Jad˙zyn

Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Pozna´n, Poland

Reprint requests to Prof. J. J.; E-mail: jadzyn@ifmpan.poznan.pl Z. Naturforsch.62a,61– 66 (2007); received October 30, 2006

The dielectric properties ofn-nonyloxycyanobiphenyl in the isotropic (I), nematic (N) and smec- tic A (SA) phases were investigated. The dielectric relaxation spectra, recorded in the frequency range 50 kHz – 100 MHz, were analyzed with use of the Cole-Cole equation. An anomalous temper- ature behavior of the static permittivity, the rotational diffusion exponent and the activation energy of mesogenic molecules rotating around their short axis, observed in the vicinity of the phase transi- tions, are discussed.

Key words: n-Nonyloxycyanobiphenyl; 9OCB; Dielectric Properties; Relaxation; Anomalous Rotational Diffusion Exponent; Activation Energy.

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