Static dielectric pretransitional effects in thermotropic liquid crystals

• Autorzy: Jadżyn J. , Czechowski G.
• Konferencja: Conference on Liquid Crystals : Chemistry, Physics and Applications ; (17 ; 09.2007 ; Augustów, Poland)
• Języki publikacji: EN

Abstrakty

EN

The paper presents a review of recent results on static dielectric behaviour in vicinity of weakly first order transition from isotropic liquid to a liquid crystalline nematic phase of compounds used in opto-electronic devices. Temperature behaviour of static permittivity and its derivative are interpreted in terms of a basic thermodynamic quantities increment (internal energy, entropy and Helmholtz free energy) induced by a probing electric field.

Słowa kluczowe

EN

liquid crystals; prenematic effects; static dielectric permittivity; entropy; Helmholtz free energy

• Wydawca: Stowarzyszenie Elektryków Polskich ; Polska Akademia Nauk ; Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
• Czasopismo: Opto-Electronics Review
• Rocznik: 2008
• Tom: Vol. 16, No. 4
• Strony: 395--398
• Opis fizyczny: Bibliogr. 14 poz., wykr.

Twórcy

autor

Jadżyn J.

autor

Czechowski G.

• Institute of Molecular Physics, Polish Academy of Sciences, 17 Smoluchowskiego Str., 60-179 Poznań, Poland,

Bibliografia

• 1. P.G. de Gennes, Physics of Liquid Crystals, Oxford University Press, Oxford, 1974.
• 2. A. Drozd-Rzoska, S.J. Rzoska, and J. Zioło, “The pretransitional anomaly of dielectric permittivity in the isotropic phase of nematogens and in the homogeneous phase of critical solutions”, J. Phys.-Condens. Mat. 12, 6135-6140 (2000).
• 3. S.J. Rzoska, A. Drozd-Rzoska, J. Zioło, P. Hajdas, and J. Jadżyn, “Critical anomaly of dielectric permittivity for the temperature and pressure paths on approaching the critical consolute point”, Phys. Rev. E64, 061104 (2001).
• 4. J. Jadżyn, G. Czechowski, C. Legrand, and R. Douali, “Static and dynamic dielectric properties of strongly polar liquids in the vicinity of first order and weakly first order phase transitions”, Phys. Rev. E67, 041705 (2003).
• 5. M. Ginovska, H. Kresse, D. Bauman, G. Czechowski, and J. Jadżyn, “Static and dynamic dielectric behaviour of mesogenic compounds of different polarity in the vicinity of the isotropic to nematic phase transition”, Phys. Rev. E69, 022701 (2004).
• 6. B. Van Roie, J. Leys, K. Denolf, C. Glorieux, G. Pitsi, and J. Thoen, “Weakly first-order character of the nematic-isotropic phase transition in liquid crystals”, Phys. Rev. E72, 041702 (2005).
• 7. J. Jadżyn, G. Czechowski, J.L. Déjardin, and M. Ginovska, “Anomalous rotational diffusion in the vicinity of the isotropic to nematic phase transition”, J. Phys.-Condens. Mat. 17, 813-819 (2005).
• 8. J. Jadżyn, J.L. Déjardin, and G. Czechowski, “Singular pretransitional behaviour of the electric field-dependent part of the thermodynamic quantities of strongly polar mesogenic liquids in the isotropic phase”, Acta Phys. Pol. A111, 877-884 (2007).
• 9. H. Fröhlich, Theory of Dielectrics, Clarendon Press, Oxford, 1958.
• 10. R. Becker, Electromagnetic Fields and Interactions, Blackie and Son, London, 1964.
• 11. L.D. Landau, E.M. Lifshitz, and L.P. Pitaevskii, Electrodynamics of Continuous Media, Pergamon Press, Oxford, 1984.
• 12. B.K.P. Scaife, Principles of Dielectrics, Clarendon Press, Oxford, 1998.
• 13. J. Jadżyn, and G. Czechowski, “Prenematic behaviour of the electric-field-induced increment of the basic thermodynamic quantities of isotropic mesogenic liquids of different polarity”, J. Phys. Chem. B111, 3727-3729 (2007).
• 14. J. Jadżyn, G. Czechowski, J.L. Déjardin, and M. Ginovska, “Contribution to understanding of the molecular dynamics in liquids”, J. Phys. Chem. A111, 8325-8329 (2007).