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1999 (1)
1998 (1)
1Author    R. Dąbrowski, J. Jadżyn, J. Dziaduszek, Z. Stolarz, G. Czechowski, M. KasprzykRequires cookie*
 Title    The Physical and Molecular Properties of New Low Melting Nematics with Negative Dielectric Anisotropy  
 Abstract    The paper presents some basic physical properties (static electric permittivities, refraction indices, density and viscosity) of 2-chloro-4-n'-alkylphenyl esters of 4-/r-alkylbicyclo[2,2,2] octane-1-carbox-ylic acids (n'=l, n = 5 and 7) which are, at room temperature, nematics with a negative dielectric an-isotropy. On the basis of temperature dependence of the principal static permittivities £ H (T) and e±(T) of the nematics, using the Maier-Meier equations, the angle between the dipole moment vector and the long axis of mesogenic molecules, the apparent molecular dipole moment square pl P[) {T), and the ne-matic order parameter S(T) were determined. 
  Reference    Z. Naturforsch. 54a, 448—452 (1999); received May 8 1999 
  Published    1999 
  Keywords    Nematics, Dielectric Anisotropy, Density, Viscosity 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0448.pdf 
 Identifier    ZNA-1999-54a-0448 
 Volume    54 
2Author    A. Kapanowski, K. SokalskiRequires cookie*
 Title    Elastic Constants of Binary Liquid Crystalline Mixtures  
 Abstract    Microscopic expressions for the elastic constants of binary liquid crystalline mixtures composed of short rigid uniaxial molecules are derived in the thermodynamic limit at small distorsions and a small density. Uniaxial and biaxial nematic phases are considered. The expressions involve the one-particle distribution functions and the potential energy of two-body short-range interactions. The theory is used to calculate the phase diagram of a mixture of rigid prolate and oblate molecules. The concentration dependence of the order parameters and the elastic constants are obtained. The possibility of phase separation is not investigated. 
  Reference    Z. Naturforsch. 53a, 963—976 (1998); received September 24 1998 
  Published    1998 
  Keywords    Liquid Crystals, Nematics, Elastic Constants, Mixtures 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0963.pdf 
 Identifier    ZNA-1998-53a-0963 
 Volume    53