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Does the characteristic value of the discontinuity of the isotropic-mesophase transition in n-cyanobiphenyls exist?
MedLine Citation:
PMID:  22842199     Owner:  NLM     Status:  Publisher    
Results of the extended Landau-de Gennes model analysis and experimental studies of the isotropic-nematic (I-N) and isotropic-smectic-A (I-SmA) phase transitions in rod-like liquid crystalline n-alkylcyanobiphenyls are presented. Experiments were carried out as a function of temperature and pressure using the static dielectric permittivity and its 'nonlinear' (strong electric field related) counterpart-the low-frequency nonlinear dielectric effect. Precise estimations of the values of the discontinuity of the isotropic-mesophase transitions (ΔT) for nCB from n = 3-14 have been obtained. It is suggested that for each nCB a unique, characteristic minimal value of ΔT, associated with the I-N-SmA triple point, exists. For 'shorter' nCBs it can be hidden in the negative pressures domain. The possibility of the extension of the 'melting curve' into the negative pressures region as well as the appearance of the 'melting inversion' at high enough pressures is indicated.
Sylwester J Rzoska; Prabir K Mukherjee; Małgorzata Rutkowska
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-27
Journal Detail:
Title:  Journal of physics. Condensed matter : an Institute of Physics journal     Volume:  24     ISSN:  1361-648X     ISO Abbreviation:  -     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-7-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101165248     Medline TA:  J Phys Condens Matter     Country:  -    
Other Details:
Languages:  ENG     Pagination:  375101     Citation Subset:  -    
Institute of High Pressure Physics PAS 'Unipress', Sokołowska 27/39, 00-142 Warsaw, Poland. Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland.
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