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1998 (2)
1Author    A. WiirflingerRequires cookie*
 Title    Nematic Potential and Order Parameter Determined from Dielectric Measurements  
 Abstract    The Maier-Saupe theory is employed in order to calculate order parameters S from the nematic po-tential q. It is found that one of the basic assumptions of the Maier-Saupe theory, q ~S, is approximate-ly fulfilled. The relation between q and S is analysed for various state changes. Previously reported find-ings for 7 PCH that q ~S, not fulfilled along isochoric changes, can be explained by taking into account the pressure and temperature dependences of q. The procedure described in this paper allows to treat experimental data for the nematic potential in a unique way, without being affected by inadequacies of experimentally determined order parameters. 
  Reference    Z. Naturforsch. 53a, 141—144 (1998); received February 11 1998 
  Published    1998 
  Keywords    Liquid Crystals, High Pressure, Nematic Potential, Dielectric Relaxation 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0141.pdf 
 Identifier    ZNA-1998-53a-0141 
 Volume    53 
2Author    A. Würflinger, S. UrbanRequires cookie*
 Title    Relations between Nematic Potential and Order Parameters (P 2 ) and (P 4 >  
 Abstract    The Maier-Saupe theory is employed in order to calculate order parameters (P 2), (P 4) from the nema-tic potential q. The relation between <r=q/(RT) and S = (P 2) corresponds well with a recently establis-hed formula by Kalmykov. The relation between the order parameters is in accordance with the analy-tic expression (P 4)=5/l (P 2) 2 proposed by Zanonni, but deviates significantly from the Faber model, according to which log (P 4)=(10/3) log (P 2). Experimental results for 5 CB obtained from Raman mea-surements, however, are in better agreement with the Faber model. 
  Reference    Z. Naturforsch. 53a, 883—886 (1998); received September 12 1998 
  Published    1998 
  Keywords    Liquid Crystals, Nematic Potential, Order Parameters 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0883.pdf 
 Identifier    ZNA-1998-53a-0883 
 Volume    53