Investigation of the Phase Transition and Absorption Properties of Liquid Crystal Hexylcyanobiphenyl/Octylcyanobiphenyl Mixtures

Mustafa Okumus; Sükrü  Özgan

doi:10.14233/ajchem.2013.13831

Issue

Vol. 25 No. 7 (2013): Vol 25 Issue 7

Issue Published : January 18, 2013

This work is licensed under a Creative Commons Attribution 4.0 International License.

Investigation of the Phase Transition and Absorption Properties of Liquid Crystal Hexylcyanobiphenyl/Octylcyanobiphenyl Mixtures

https://doi.org/10.14233/ajchem.2013.13831

Mustafa Okumus

Department of Physics, Faculty of Art and Science, Kahramanmaras Sutcu Imam University, 46100, Kahramanmaras, Turkey

Sükrü Özgan

Department of Physics, Faculty of Art and Science, Kahramanmaras Sutcu Imam University, 46100, Kahramanmaras, Turkey

Corresponding Author(s) : Mustafa Okumus

m.okumus@ksu.edu.tr

Asian Journal of Chemistry, Vol. 25 No. 7 (2013): Vol 25 Issue 7
Article Published : February 4, 2013

Abstract

The hexylcyanobiphenyl (6CB) and octylcyanobiphenyl (8CB) mixtures have been investigated by means of differential scanning calorimeter and ultraviolet. Differential scanning calorimeter results indicate clearly the existence of four phase transitions in the 6CB/8CB mixtures. The phase diagram of mixture was obtained from differential scanning calorimeter and theoretical calculations. The experimental phase diagram is approximately similar to the calculated phase diagram. The phase transition temperatures of the 6CB/8CB mixtures rise with the heating rate between 2 ºC/min and 10 ºC/min. The activation energies were calculated for the phase transitions of 50 % 6CB and 50 % 8CB liquid crystal mixtures. UV experiments were carried out to characterize the absorptivity constants of liquid crystal and their mixtures. The molar absorptivity and maximum absorption wavelengths were measured in chloroform solution by UV spectrophotometry. The maximum absorption wavelength of the 6CB/8CB mixtures increases with decreasing percent weight of 8CB in 6CB, a result associated with the different lengths of the alkyl chain.

Keywords

Liquid crystal mixtures Thermodynamic properties Optical properties Hexylcyanobiphenyl Octylcyanobiphenyl

Okumus, M., & Özgan, S. (2013). Investigation of the Phase Transition and Absorption Properties of Liquid Crystal Hexylcyanobiphenyl/Octylcyanobiphenyl Mixtures. Asian Journal of Chemistry, 25(7), 3879–3883. https://doi.org/10.14233/ajchem.2013.13831

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References

E.B. Priestley, P.J. Wojtowicz and P. Sheng, Introduction to Liquid Crystals, Plenum Press, London (1974).
D. Demus, J. Goodby, G.W. Gray, H.W. Spiess and V. Vill, Handbook of Liquid Crystals, Wiley-VCH (1998).
J.W. Doane, In ed.: B. Bahadur, Liquid Crystals, Applications and Uses, World Scientific, Singapore, Vol. 1 (1990).
H.S. Kitzerow, Liq. Cryst., 16, 1 (1994).
K. Ichimura, Chem. Rev., 100, 1847 (2000).
S. Chandrasekhar, Liquid Crystals, University Press, Cambridge, edn. 2 (1992).
P.G. De Gennes and J. Prost, The Physics of Liquid Crystals, Oxford Science Publications, Clarendom Press, Oxford, edn. 2 (1993).
S.T. Wu and D.K. Yang, Reflective Liquid Crystal Displays, Wiley: New York (2001).
U. Maschke, M. Benmouna and X. Coqueret, Macromol. Rapid Commun., 23, 159 (2002).
M.T. Viciosa, A.M. Nunes, A. Fernandes, P.L. Almeida, M.H. Godinho and M.D. Dionísio, Liq. Cryst., 29, 429 (2002).
J.C. Gonzáles, M.R. Vieytes, A.M. Botana, J.M. Vieites and L.M. Botana, J. Chromatogr. A, 910, 119 (2001).
J. Czub, S. Urban and A. Würflinger, Liq. Cryst., 33, 85 (2006).
G.W. Gray, K.J. Harrison and J.A. Nash, Electron. Lett., 9, 130 (1973).
G.A. Oweimreen and M.A. Morsy, Thermochim. Acta, 346, 37 (2000).
Liquid Crystals Catalogue, BDH Chemicals Limited Company, Poole, England.
H. Marynissen, J. Thoen and W. Van Dael, Mol. Cryst. Liq. Cryst., 97, 149 (1983).
M.B. Sied, D.O. López, J. Ll Tamarit and M. Barrio, Liq. Cryst., 29, 57 (2002).
I. Schröder, Z. Phys. Chem., 11, 449 (1893).
J.J. Z. Van Laar, Z. Phys. Chem., 64, 2557 (1908).
L.M. Blinov and V.G. Chigrinov, Electrooptic Effects in Liquid Crystal Materials, Springer-Verlag, New York (1994).
G.A. Oweimreen and J.S. Hwang, Chem. Phys. Lett., 334, 83 (2001).
T. Bouchaour, F. Benmouna, F. Roussel, J.-M. Buisine, X. Coqueret, M. Benmouna and U. Maschke, Polymer, 42, 1663 (2001).
T. Ozawa, J. Therm. Anal., 2, 301 (1970).
H.E. Kissinger, Anal. Chem., 29, 1702 (1957).
J. Jadzyn, G. Czechowski and S. Laskowski, Acta Phys. Polonica A, 109, 723 (2006).
S. Özgan and M. Okumus, Braz. J. Phys., 41, 118 (2011).
S. Neuenfeld and C. Schick, Thermochim. Acta, 446, 55 (2006).
S.T. Wu, J. Appl. Phys., 69, 2080 (1991).
J.D.J. Ingle and S.R. Crouch, Spectrochemical Analysis; Prentice Hall: Englewood Cliffs, New Jersey (1988).
J. Gonzalo, P.E. Dyer and M. Hird, Appl. Phys. Lett., 71, 2752 (1997).
P.T. Lin, S.T. Wu, C.Y. Shang and C.S. Hsu, Mol. Cryst. Liq. Cryst., 411, 243 (2004).

References

E.B. Priestley, P.J. Wojtowicz and P. Sheng, Introduction to Liquid Crystals, Plenum Press, London (1974).

D. Demus, J. Goodby, G.W. Gray, H.W. Spiess and V. Vill, Handbook of Liquid Crystals, Wiley-VCH (1998).

J.W. Doane, In ed.: B. Bahadur, Liquid Crystals, Applications and Uses, World Scientific, Singapore, Vol. 1 (1990).

H.S. Kitzerow, Liq. Cryst., 16, 1 (1994).

K. Ichimura, Chem. Rev., 100, 1847 (2000).

S. Chandrasekhar, Liquid Crystals, University Press, Cambridge, edn. 2 (1992).

P.G. De Gennes and J. Prost, The Physics of Liquid Crystals, Oxford Science Publications, Clarendom Press, Oxford, edn. 2 (1993).

S.T. Wu and D.K. Yang, Reflective Liquid Crystal Displays, Wiley: New York (2001).

U. Maschke, M. Benmouna and X. Coqueret, Macromol. Rapid Commun., 23, 159 (2002).

M.T. Viciosa, A.M. Nunes, A. Fernandes, P.L. Almeida, M.H. Godinho and M.D. Dionísio, Liq. Cryst., 29, 429 (2002).

J.C. Gonzáles, M.R. Vieytes, A.M. Botana, J.M. Vieites and L.M. Botana, J. Chromatogr. A, 910, 119 (2001).

J. Czub, S. Urban and A. Würflinger, Liq. Cryst., 33, 85 (2006).

G.W. Gray, K.J. Harrison and J.A. Nash, Electron. Lett., 9, 130 (1973).

G.A. Oweimreen and M.A. Morsy, Thermochim. Acta, 346, 37 (2000).

Liquid Crystals Catalogue, BDH Chemicals Limited Company, Poole, England.

H. Marynissen, J. Thoen and W. Van Dael, Mol. Cryst. Liq. Cryst., 97, 149 (1983).

M.B. Sied, D.O. López, J. Ll Tamarit and M. Barrio, Liq. Cryst., 29, 57 (2002).

I. Schröder, Z. Phys. Chem., 11, 449 (1893).

J.J. Z. Van Laar, Z. Phys. Chem., 64, 2557 (1908).

L.M. Blinov and V.G. Chigrinov, Electrooptic Effects in Liquid Crystal Materials, Springer-Verlag, New York (1994).

G.A. Oweimreen and J.S. Hwang, Chem. Phys. Lett., 334, 83 (2001).

T. Bouchaour, F. Benmouna, F. Roussel, J.-M. Buisine, X. Coqueret, M. Benmouna and U. Maschke, Polymer, 42, 1663 (2001).

T. Ozawa, J. Therm. Anal., 2, 301 (1970).

H.E. Kissinger, Anal. Chem., 29, 1702 (1957).

J. Jadzyn, G. Czechowski and S. Laskowski, Acta Phys. Polonica A, 109, 723 (2006).

S. Özgan and M. Okumus, Braz. J. Phys., 41, 118 (2011).

S. Neuenfeld and C. Schick, Thermochim. Acta, 446, 55 (2006).

S.T. Wu, J. Appl. Phys., 69, 2080 (1991).

J.D.J. Ingle and S.R. Crouch, Spectrochemical Analysis; Prentice Hall: Englewood Cliffs, New Jersey (1988).

J. Gonzalo, P.E. Dyer and M. Hird, Appl. Phys. Lett., 71, 2752 (1997).

P.T. Lin, S.T. Wu, C.Y. Shang and C.S. Hsu, Mol. Cryst. Liq. Cryst., 411, 243 (2004).

Issue

Vol. 25 No. 7 (2013): Vol 25 Issue 7

Investigation of the Phase Transition and Absorption Properties of Liquid Crystal Hexylcyanobiphenyl/Octylcyanobiphenyl Mixtures

Corresponding Author(s) : Mustafa Okumus

Abstract

Keywords

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