Refractive Indices, Order Parameter and Optical Transmittance Studies of a Nematic Liquid Crystal Mixture

• Authors: A. Singh , R. Manohar , J. Shukla , A. Biradar
• Languages of publication: EN

Abstracts

EN

Measurements of ordinary refractive index, birefringence, density, and order parameter were made on a technologically important nematogen and the data obtained for its nematic and isotropic phase were reported. A modified wedge method was used for the measurement of the birefringence (δ n). The nematic-isotropic phase transition temperature matches very well as is exhibited from the value of refractive indices and densities obtained using different techniques. The optical anisotropy and density data were used to determine the order parameter and principal polarizability of the nematic mixture using the Vuks approach and their temperature dependence was discussed. The macroscopic order parameter was obtained and compared with microscopic order parameter. These two values agree very well.

Keywords

EN

61.30.-v; 42.70.Df

Discipline

• 61.30.-v: Liquid crystals(for phase transitions in liquid crystals, see 64.70.M-; for liquid crystals as dielectric materials, see 77.84.Nh; for liquid crystals as optical materials, see 42.70.Df; for liquid crystal devices, see 42.79.Kr)
• 42.70.Df: Liquid crystals(for structure of liquid crystals, see 61.30.-v)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2006
• Volume: 110
• Issue: 4
• Pages: 485-493

Dates

published

2006-10

received

2006-04-03

(unknown)

2006-08-31

Contributors

author

A. Singh

• Department of Physics, Lucknow University, Lucknow-226 006, India

author

R. Manohar

• Department of Physics, Lucknow University, Lucknow-226 006, India

author

J. Shukla

• Department of Physics, Lucknow University, Lucknow-226 006, India

author

A. Biradar

• National Physical Laboratory, New Delhi, India

References

• 1. Liquid Crystals: Applications and Uses, Vol. 1, Ed. B. Bahadur, World Sci., New Jersey, USA 1990
• 2. W.H. de Jeu, Mol. Cryst. Liq. Cryst., 63, 83, 1980
• 3. N.V.S. Rao, V.G.K.M. Pisipati, P.V. Datta Prasad, P.R. Alapati, Mol. Cryst. Liq. Cryst., 132, 1, 1986
• 4. P.G. de Gennes, The Physics of Liquid Crystal, Clarendon Press, Oxford 1974, p. 3
• 5. S. Chandrasekhar, Liquid Crystals, Cambridge University Press, Cambridge 1977; Rep. Prog. Phys., 39, 613, 1976
• 6. M.J. Stephen, J.P. Straley, Rev. Mod. Phys., 46, 193, 1974
• 7. E.G. Hanson, Y.R. Shen, Mol. Cryst. Liq. Cryst., 36, 132, 1976
• 8. V. Tsvetkov, Acta Physicochim. (USSR), 16, 132, 1942
• 9. E.G. Hanson, Y.R. Shen, Mol. Cryst. Liq. Cryst., 36, 193, 1979
• 10. I. Haller, H.A. Huggins, H.R. Lilienthal, T.R. McGuire, J. Phys. Chem., 77, 950, 1973
• 11. I.H. Ibrahim, W. Haase, Z. Naturforsch., 319, 1644, 1979
• 12. W.H. de Jeu, P. Bordewijk, J. Chem. Phys., 68, 109, 1978
• 13. I. Haller, H.A. Huggins, M.H. Freiser, Mol. Cryst. Liq. Cryst., 16, 53, 1972
• 14. F.V. Allan, Information Displays, 10, 14, 1983
• 15. H.S. Cole, S. Aftergut, J. Chem. Phys., 68, 896, 1978
• 16. R. Singh, V.K. Agrawal, P.P. Anand, V.P. Arora, Natl. Acad. Sci. Lett. (India), 13, 129, 1990
• 17. M. Mitra, S. Paul, R. Paul, Pramana - J. Phys., 29, 409, 1987
• 18. V.P. Arora, S. Prakash, V.K. Agrawal, B. Bahadur, Ind. J. Pure Appl. Phys., 30, 406, 1992
• 19. BDH Catalog, BDH Chemical Ltd., Poole BH 12 4NN, England 1978, p. 19
• 20. Li Jun, S. Gauzia, S.T. Wu, Optics Express, 12, 9, 2004
• 21. R.K. Sarna, B. Bahadur, V.G. Bhide, Mol. Cryst. Liq. Cryst., 51, 117, 1979
• 22. Operating Manual, JULABO, Labortechnik Gmbh, p. 17
• 23. I. Musevic, I. Drevensek, R. Blinc, S. Kumar, J.W. Doane, Mol. Cryst. Liq. Cryst., 172, 217, 1989
• 24. W.H. de Jeu, Physical Properties of Liquid Crystalline Materials, Gordon and Breach, New York 1980
• 25. I. Haller, Prog. Solid State Chem. (GB), 10, 103, 1975
• 26. R.G. Horn, J. Phys. (France), 39, 105, 1978
• 27. M.F. Vuks, Opt. Spectrosc. (USA), 20, 361, 1966
• 28. Handbook of Physics and Chemistry (CRC), 57th ed., CRC Press, Cleveland, Ohio 1976, p. 77; C.P. Smyth, Dielectric Behaviour and Structure, McGraw-Hill, New York 1975
• 29. D. Demus, H.G. Hahn, F. Kuschel, Mol. Cryst. Liq. Cryst., 44, 61, 1978
• 30. J. Cheng, R.B. Meyer, Phys. Rev. A, 9, 2744, 1974
• 31. K. Bhowmick, A. Mukhopadhyay, C.D. Mukherjee, Mol. Cryst. Liq. Cryst., 366, 229, 2001
• 32. N.H. Harston, A. Stuart, Crystals and Polarizing Microscope, Edward Arnold, London 1970
• 33. W. Kuczyński, B. Zywucki, J. Malecki, Mol. Cryst. Liq. Cryst., 381, 1, 2002
• 34. S. Sen, P. Brahma, K. Roy Subik, D.K. Mukherjee, S.B. Roy, Mol. Cryst. Liq. Cryst., 100, 327, 1983
• 35. A.K. Garg, V.K. Agarwal, B. Bahadur, Mol. Cryst. Liq. Cryst., 130, 11, 1985

Identifiers

DOI

10.12693/APhysPolA.110.485