Perfluoroalkyl-n-eicosanes at the Air-Water Interface-A Monolayer Study

• Autorzy: Broniatowski M. , Dynarowicz-Łątka P.
• Języki publikacji: EN

Abstrakty

EN

Perfluoroalkyl-n-eicosanes of the general formula F(CF2)m(CH2)20H, where m = 4,6, 8,10,12 were spread at the air/water as Langmuir monolayers and studied at different experimental conditions, such as spreading volume, subphase temperature and compression speed. The Langmuir monolayer experiments (-A isotherms) have been complemented with quantitative Brewster angle microscopy results, which enabled estimation of the film thickness at different stages of compression. Although the investigated molecules do not possess any polar group and are purely hydrophobic, they form stable monomolecular layers at the free water surface. The negative sign of the measured surface potential, Delta V, evidences for the orientation of the molecules with their perfluorinated parts exposed towards the air, independently of the length of the perfluorinated moiety. The relative intensity measurements allow one to conclude that the molecules with shorter perfluorinated part (F4H20, F6H20 and F8H20) are oriented almost vertically (in respect to the interface) in the vicinity of film collapse, while F10H20 and F12H20 are tilted to the water surface.

Słowa kluczowe

EN

semifluorinated alkanes; Langmuir monolayers; surface potential; Brewster angle microscopy; air/water interface

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2004
• Tom: Vol. 78 / nr 7
• Strony: 973--985
• Opis fizyczny: Bibliogr. 32 poz., rys.

Twórcy

autor

Broniatowski M.

• Jagiellonian University, Faculty of Chemistry, Ingardena 3, 30-060 Kraków, Poland

autor

Dynarowicz-Łątka P.

• Jagiellonian University, Faculty of Chemistry, Ingardena 3, 30-060 Kraków, Poland

Bibliografia

• 1. Gaines G.L. Jr., Langmuir, 7, 3054 (1991).
• 2. Jarvis N.L. and Zisman W.A, in Encyclopedia of Chemical Technology. Vol. 7. Wiley, NY 1966.
• 3. Hoffinann H. and Würz J., J. Mol. Liq., 72, 191 (1997).
• 4. Lo Nostro P., Ku C.Y., Chen S.H. and Lin J.S., J. Phys.Chem., 99, 10858 (1995).
• 5. Ha K.R., Kim J.M. and Rabolt J.F., Thin Solid Films, 347, 272 (1999).
• 6. Tadros T.F., J. Colloid Interface Sei, 75, 196 (1980).
• 7. Kunieda H. and Shinoda K., J. Phys. Chem., 80, 2468 (1976).
• 8. Lehmler H.J., Jay M. and Bummer P., Langmuir, 16,10161 (2000).
• 9. Riess J.G., Tetrahedron, 58, 4113 (2002).
• 10. Turberg M.P. and Brady J.E., J. Am. Chem.Soc., 110, 7797 (1988).
• 11. Binks B.P., Fletcher P.D.I., Sager W.F.C. and Thompson R.L., J. Mol. Liq., 72, 177 (1997).
• 12. Binks B.P., Fletcher P.D.I., Sager W.F.C. and Thompson R.L., Langmuir, 11, 977 (1995).
• 13. Hayami Y. and Findenegg G.H., Langmuir, 13,4865 (1997).
• 14. Binks B.P., Fletcher P.D.I., Kotsev S.N. and Thompson R.L., Langmuir, 13, 6669 (1997).
• 15. Marczuk P., Lang P. and Möller M., Coll. Surf. A, 163, 103 (2000).
• 16. Huang Z., Acero A.A., Lei N., Rice S.A., Zhang Z. and Schlossman M.L., J. Chem. Soc., Faraday Trans., 92, 545 (1996).
• 17. El Abed A., Faure M.C., Pouzet E. and Abillon O., Phys. Rev. E, 65, art. no. 051603 (2002).
• 18. Kim N. and Shin S., J. Chem. Phys., 110, 10239 (1999).
• 19. Rabolt J.F., Russell T.P. and Twieg R.J., Macromol., 17, 2786 (1984).
• 20. Azzam R.M.A. and Bashara N.M., in Ellipsometry and Polarized Light, 1st ed., North Holland, Amsterdam 1992.
• 21. Davies J.T. and Rideal E.K., in Interfacial Phenomena. 2nd ed, Academic Press, NY, 1963, pp. 265 and 65.
• 22. Harkins W.D., in The Physical Chemistry of Surface Films. Reinhold Publ. Corp., NY, 1952, p. 107.
• 23. Reis T., in Introduction a la Chimie-Physique des Surfaces. Dunod. Paris, 1952, p. 111.
• 24. Leite V.B.P., Cavalli A. and Oliveira O.N. Jr., Phys. Rev. E, 57, 6835 (1998).
• 25. Bunn C.W. and Howells E.R., Nature, 174, 549 (1954).
• 26. Napoli M., Conte L. and Gambaretto G.P., J. Fluor. Chem., 85, 163 (1997).
• 27. Napoli M., Conte L. and Guerrato A., J. Fluor. Chem., 110, 47 (2001).
• 28. Vogel V. and Möbius D., J. Colloid Interface Sei., 126,408 (1988).
• 29. Davies J.T. and Rideal E.K., Can. J. Chem., 33,947 (1955).
• 30. HyperChem Professional Release 5.1, A Molecular Visualization and Simulation Software Package Hypertube Inc., Gainesville, Florida, USA, 1988.
• 31. Viney C., Russel T.P., Depero L.E. and Twieg R.J., Mol. Cryst. Liq. Cryst., 168, 63 (1989).
• 32. Lo Nostro P. and Chen S.H., J. Phys. Chem., 97, 6535 (1993).