Molecular Interactions in Monolayers οf Azo Dye/Liquid Crystal Mixtures at Interfaces

• Authors: D. Bauman , A. Płóciennik , K. Inglot
• Languages of publication: EN

Abstracts

EN

A study of azo dye/liquid crystal mixtures in monolayers formed at an air-water interface (the Langmuir films) and at a solid surface (the Langmuir-Blodgett films) has been performed. Five azo dyes with various molecular structure and the liquid crystal 4-octyl-4'-cyanobiphenyl (8CB) have been used. The dyes have been added to the liquid crystal at various molar fractions. Surface pressure and surface potential versus mean molecular area isotherms for the Langmuir films have been recorded and information about intermolecular interactions at the air-water interface has been obtained. On the basis of electronic absorption measurements for the Langmuir and Langmuir-Blodgett films the conclusions about the ability of dyes molecules to form self-aggregates at the interfaces have been drawn. The influence of the dye molecular structure and its concentration on aggregates' geometry has been found.

Keywords

EN

68.18.-g; 68.47.Pe; 61.30.Gd; 33.20.-t

Discipline

• 61.30.Gd: Orientational order of liquid crystals; electric and magnetic field effects on order
• 68.47.Pe: Langmuir-Blodgett films on solids; polymers on surfaces; biological molecules on surfaces
• 33.20.-t: Molecular spectra(see also 78.47.J- Ultrafast spectroscopy (<1>
• 68.18.-g: Langmuir-Blodgett films on liquids(for L-B films on solids, see 68.47.Pe)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2009
• Volume: 116
• Issue: 2
• Pages: 203-210

Dates

published

2009-08

received

2009-01-15

(unknown)

2009-06-01

Contributors

author

D. Bauman

• Faculty of Technical Physics, Poznań University of Technology, Nieszawska 13A, 60-965 Poznań, Poland

author

A. Płóciennik

• Faculty of Technical Physics, Poznań University of Technology, Nieszawska 13A, 60-965 Poznań, Poland

author

K. Inglot

• Faculty of Technical Physics, Poznań University of Technology, Nieszawska 13A, 60-965 Poznań, Poland

References

• 1. H. Meier, in: The Chemistry of Synthetic Dyes, Ed. K. Venkataraman, Vol. IV, Academic Press, New York 1971, p. 389
• 2. Side-Chain Liquid Crystal Polymers, Ed. C.B. Mc Ardle, Blackie, Glasgow 1984
• 3. Organic Molecular Aggregates: Electronic Excitation and Interaction Processes, Eds. P. Reineker, H. Haken, H.C. Wold, Springer, Berlin 1983
• 4. G. Roberts, Langmuir-Blodgett Films, Plenum Press, New York 1990
• 5. A. Ulman, An Introduction to Ultrathin Organic Films: from Langmuir-Blodgett to Self-Assembly, Academic Press, New York 1991
• 6. M.C. Petty, Langmuir-Blodgett films - An Introduction, Cambridge University Press, Cambridge 1996
• 7. T. Martyński, A. Biadasz, D. Bauman, Liq. Cryst. 29, 281 (2002)
• 8. K. Inglot, A. Kaleta, T. Martyński, D. Bauman, Dyes Pigments 77, 303 (2008)
• 9. K. Inglot, T. Martyński, D. Bauman, Dyes Pigments 80, 106 (2009)
• 10. K. Inglot, T. Martyński, D. Bauman, Opto-Electron. Rev. 17, 120 (2009)
• 11. A. Biadasz, K. Łabuszewska, E. Chrzumnicka, E. Michałowski, T. Martyński, D. Bauman, Dyes Pigments 74, 598 (2007)
• 12. J. Xue, C.S. Jung, M.W. Kim, Phys. Rev. Lett. 69, 474 (1992)
• 13. K. Inglot, T. Martyński, D. Bauman, Liq. Cryst. 33, 855 (2006)
• 14. A. Biadasz, T. Martyński, R. Stolarski, D. Bauman, Liq. Cryst. 31, 1639 (2004)
• 15. G.L. Gaines, Insoluble Monolayers at Liquid-Gas Interface, Interscience, New York 1966
• 16. A. Angelova, M. van der Auweraer, R. Ionov, D. Vollhardt, F.C. De Schryver, Langmuir 11, 3167 (1995)
• 17. J.T. Davies, E.K. Rideal, Interfacial Phenomena, Academic Press, New York 1963
• 18. D. Myers, Surfaces, Interfaces and Colloids, Wiley-VCH, New York 1999
• 19. P. Schmitz, H. Gruler, Europhys Lett. 29, 451 (1995)
• 20. R.J. Demchak, T.J. Fort, Jr., J. Colloid Interface Sci. 46, 191 (1974)
• 21. P. Dynarowicz-Łątka, Adv. Colloid Interface Sci. 45, 215 (1993)
• 22. O.N. Oliveira, Jr., D.M. Taylor, T.J. Lewis, S. Salvagno, C.J.M. Stirling, J. Chem. Soc. Faraday Trans. 85, 85 (1989)
• 23. D.M. Taylor, G.F. Baynes, Mater. Sci. Eng. C 8-9, 65 (1999)
• 24. T. Martyński, A. Biadasz, D. Bauman, Z. Naturforsch. 58a, 97 (2003)
• 25. A.S. Davydov, Theory of Molecular Excitons, Mc Graw-Hill Book Co., New York 1962
• 26. M. Kasha, H.R. Rawls, M. Ashraf El-Bayoumi, Pure Appl. Chem. 11, 371 (1965)
• 27. D. Moebius, Adv. Mater. 7, 437 (1995)
• 28. A. Miyata, D. Heard, Y. Unuma, Y. Higashigaki, Thin Solid Films 210/211, 175 (1992)
• 29. T. Kawai, J. Umemura, T. Takenaka, Langmuir 5, 1378 (1989)
• 30. E. Johnson, R. Aroca, Y. Nagao, J. Phys. Chem. 95, 8840 (1991)
• 31. R. Hertmanowski, T. Martyński, D. Bauman, J. Mol. Struct. 741, 201 (2005)
• 32. A. Biadasz, T. Martyński, R. Stolarski, D. Bauman, Liq. Cryst. 33, 307 (2006)

Identifiers

DOI

10.12693/APhysPolA.116.203