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'Dielectric Anisotropy' in keywords Facet   Publication Year 1999  [X]
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1999[X]
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    S. UrbanRequires cookie*
 Title    Dielectric Studies of 4-w-Hexyloxy-4'-Cyanobiphenyl (60CB) at Elevated Pressure  
 Abstract    The principal dielectric permittivity components in the nematic phase of 4-rc-hexyloxy-4'-cyanobiph-enyl (60CB) were measured as functions of temperature at ambient pressure and as functions of pres-sure up to 100 MPa at several constant temperatures. The dielectric anisotropy is analized in the frame of the Maier-Meier equations. The pressure dependence of the order parameter is deduced. Preliminary results for the activation volume and activation enthalpy from the pressure and temperature dependenc-es of the longitudinal relaxation times are obtained. 
  Reference    Z. Naturforsch. 54a, 365—369 (1999); received March 29 1999 
  Published    1999 
  Keywords    Nematic Liquid Crystal, 60CB, Dielectric Anisotropy, Order Parameter, High Pressure 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0365.pdf 
 Identifier    ZNA-1999-54a-0365 
 Volume    54