• Keine Ergebnisse gefunden

Analysis of the Dielectric Anisotropy of Typical Nematics with the Aid of the Maier-Meier Equations

N/A
N/A
Protected

Academic year: 2022

Aktie "Analysis of the Dielectric Anisotropy of Typical Nematics with the Aid of the Maier-Meier Equations"

Copied!
1
0
0

Wird geladen.... (Jetzt Volltext ansehen)

Volltext

(1)

Analysis of the Dielectric Anisotropy of Typical Nematics with the Aid of the Maier-Meier Equations

StanisΩaw Urban, Jerzy Ke˛dzierskia, and Roman Da˛browskia

Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Cracow, Poland

aMilitary University of Technology, 00-908 Warsaw, Poland

Reprint requests to Prof. S. U.; Fax: +48-12-6337086; E-mail: ufurban@cyf-kr.edu.pl Z. Naturforsch. 55 a, 449 – 456 (2000); received December 9, 1999

Using the experimental data on the dielectric anisotropy, density, polarizability, dipole moment, and order parameter in the nematic phase of seven typical liquid crystalline substances, the applicability of the Maier-Meier theory for the description of the dielectric properties of nematics is checked. Substanc- es with different polarity and different tendency to form associates in the nematic phase were studied.

It is found that the Maier-Meier equations describe fairly well the dielectric permittivity components of nematics. The estimated values of the angle Cformed by the dipole moment with the long molecular axis are compared with those obtained in other studies.

Key words: Nematic Liquid Crystals; Dielectric Anisotropy; Maier-Meier Equations.

Referenzen

ÄHNLICHE DOKUMENTE

A variation in results is given in both parameters, mean susceptibility and degree of anisotropy, for all investigated lithologies; (b) Cross plot of foliation factor versus

Consistently to the angular differential cross sections, the agreement of the energy differential cross section with the theoretical calculations is optimal for the low beam

• When the Thomson scattering is efficient (i.e., tight coupling between photons and baryons via electrons), the distribution of photons from the rest frame of. baryons

• How does the power spectrum constrain the baryon density.. • Via the speed of sound, the increased inertia of a photon-baryon fluid, and

The dielectric properties (viz., constant ε , loss tan δ , ac conductivity σ ac over a wide range of frequencies and temperatures, dielectric breakdown strength) have been studied as

Recollecting the data, the slight increase in the dielectric constant and loss at low frequen- cies at room temperature for PbO-Ga 2 O 3 -P 2 O 5 :Cr 2 O 3 glasses may be ascribed

We have also found that the obtained activation ener- gies for hopping in case of CuC9 are different from those for the other two materials with even number of carbon atoms

On the basis of temperature dependence of the principal static permittivities ε || (T ) and ε ⊥ (T ) of the nematics, using the Maier-Meier equations, the angle between the