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A Structural Study of Two Oxyethylene Alkyl Ether-Water Mesophase Systems in the Presence of Small Amount of Sodium Dodecyl Sulphate, SDS Ionic Surfactant

Untersuchung der Struktur von zwei Mesophasensystemen aus Oxiethylenalkylethern und geringen Mengen an Natriumdodecylsulfat (SDS)
  • M. Alibrahim


Two structural studies of the following two liquid crystals systems: [(C12EO4 + 1% SDS)/H2O, ca. 25–85 wt.% surfactant] and [(C12EO8 + 1% SDS)/H2O, ca. 40–71 wt.% surfactant] have been investigated. Both previous systems contain similar amount of Sodium Dodecyl Sulphate, SDS. It has been found that there are two mesophases at 25°C: the lamellar Lα and the hexagonal H1. Their structural parameters were determined using small angle X-ray scattering (SAXS) patterns. The mesophases study of the Lα and H1 regions allows the evolution description of the surfactant chains conformation.

The geometrical parameters of the Lα and H1 mesophases such as the thickness of hydrocarbon core of the lamellar mesophase and the diameter of rods forming the hexagonal structure were calculated. In the lamellar, Lα and the hexagonal, H1 mesophases, the surface area per molecule and the thickness of the hydrocarbon core exhibited a little sensitivity change toward concentration. The thickness of the ethoxy groups was estimated in Lα and H1 mesophases as a function of surfactant concentration in (C12EO4 + 1% SDS)/H2O and (C12EO8 + 1% SDS)/H2O systems at 25°C, respectively.


Die Strukturen der beiden flüssigkristallinen Systeme [(C12EO4 + 1% SDS)/H2O, ca. 25–85 wt.% Tensid] und [(C12EO8 + 1% SDS)/H2O, ca. 40–71 wt.% Tensid] wurden untersucht. Beide enthielten ähnliche Mengen an Natriumdodecylsulfat (SDS). Es konnte gezeigt werden, dass die Systeme bei 25°C zwei Mesophasen ausbilden: die lamellare Lα- und die hexagonale H1-Phase. Die strukturellen Parameter wurden mittels Kleinwinkelröntgenstreuung (SAXS) bestimmt. Die Untersuchung der Mesophasen in der Lα- und der H1-Region ermöglicht die Beschreibung der Tensidkettenkonformation.

Die geometrischen Parameter der Lα- und der H1-Mesophase, wie die Dicke des Kohlenwasserstoffkerns der lamellaren Mesophase oder der Durchmesser in der hexagonalen Mesophase gebildeten Stäbchen, wurden berechnet. In der lamellaren Lα- und der hexagonalen H1-Mesophase zeigten der Oberflächenplatzbedarf pro Molekül und die Dicke des Kohlenwasserstoffkerns eine geringe Abhängigkeit gegenüber der Konzentration. Die Dicke der Ethoxy-Gruppen in der Lα- und H1-Mesophase wurde als Funktion der Tensidkonzentration in den (C12EO4 + 1% SDS)/H2O und (C12EO8 + 1% SDS)/H2O-Systemen bei 25°C berechnet.

Alibrahim Moussa, Atomic Energy Commission, Chemistry Department, P.O.Box 6091, Damascus/Syria. E-Mail:

Moussa Alibrahim was born in 1955 and obtained his B.Sc. in the field of chemistry from Damascus University in 1979 and his ph.D. in the field of Chemistry and molecular physical chemistry (France-Nancy university I, 1988). In 1980 he started working in the Syrian Atomic Energy Commission in chemistry department. he has been awarded to prepare his ph.D. in France (Nancy university I) from 1982 to 1988, under the supervision of Prof. J. C. Ravey; Prof. C. Tondre; Prof. M. J. Stebe and J. J. Delpuech. His theses presented subject is [SYSTEMES A BASE DE TENSIOACTIFS NONIONIQUES: INFLUENCE DE CO-TENSIOACTIFS IONIQUES ET STRUCTURE DES PHASES MESOMORPHES]. He restarted working in the chemistry department of the Syrian Atomic Energy Commission again from 1989 until now, in the field of Physical Chemistry and Solvent Extraction.


1. Rosen, M. J.: Surfactants and interfacial phenomena. John-wiley. New York (1988).Search in Google Scholar

2. Scamehom, J. F.: (Ed.). Phenomena in mixed surfactant systems. ACS symposium series. American Chemical Society. Washington. D.C., 311 (1986). 10.1021/symposiumSearch in Google Scholar

3. Holland, P. M. and Rubingh, D. N.: (Eds.). Mixed surfactant systems. ACS symposium series. American Chemical Society. Washington. D.C., 501 (1992). 10.1021/symposiumSearch in Google Scholar

4. Ogino, K. and Abe, M.: (Eds.). Mixed surfactant systems. Surfactant science series. Marcel Dekker. New York46 (1993).Search in Google Scholar

5. Rosen, M. J., Zhu, Z. H. and Gao, T.: J. Colloid Interf. Sci.157 (1993) 254. 10.1006/jcis.1993.1183Search in Google Scholar

6. Lockwood, N. A., Gupta, J. K. and Abbott, N. L.: Surface Science Reports636 (2008) 255293. 10.1016/j.surfrep.2008.02.002Search in Google Scholar

7. Shrestha, L. K., Saito, E., Shrestha, R. G., Kato, H., Takase, Y. and Aramaki, K.: Colloids and Surfaces A: Physico Chemical and Engineering Aspects293 (2007) 13, 262–271. 10.1016/j.colsurfa.2006.06.038Search in Google Scholar

8. Richards, C., Tiddy, G. J. T. and Casey, S.: Colloids and Surfaces A: Physico Chemical and Engineering Aspects288 (2006) 103112. 10.1016/j.colsurfa.2006.04.037Search in Google Scholar

9. Blankschtein, D. and Shiloach, A.: Langmuir14 (1998) 1618. 10.1021/la971151rSearch in Google Scholar

10. Mitchell, D. J., Tiddy, G. J. T., Waring, L., Bostock, T. and McDonald, M. P.: J. Chem. Soc. Faraday Trans I.79 (1983) 9751000. 10.1039/f19837900975Search in Google Scholar

11. Tanford, C.: The hydrophobic effect, formation of micelles and biological membranes. John Wiley and Sons. Inc.New York (1973).Search in Google Scholar

12. Funari, SergioS. and Rapp, Gert: J. Phys. Chem. B, 101 (1997) 732739. 10.1021/jp9629250Search in Google Scholar

13. Alibrahim, M.: Tenside Surf. Det.434 (2006) 197203.10.3139/113.100308Search in Google Scholar

14. Alibrahim, M., Stebe, M. J., Dupont, G. and Ravey, J. C.: J. Chim. Phys.94 (1997) 16141633.10.1051/jcp/1997941614Search in Google Scholar

15. Strey, R. and Pakusch, A.: Mittal, K. L. and Bothorel, P. (Eds). Surfactants in Solution, Plenum. New York (1987) 465.10.1007/978-1-4613-1831-6_37Search in Google Scholar

16. Kunieda, H., Shigeta, K., Ozawa, K. and Suzuki, M.: J. Phys. Chem.101 (1997) 7952.Search in Google Scholar

17. Tanford, C.: J. Phys. Chem.76 (1972) 3020. 10.1021/j100665a018Search in Google Scholar

18. Huang, K. L., Shigeta, K. and Kunieda, H.: Prog. Colloid Polym. Sci.110 (1998) 171. 10.1007/BFb0118035Search in Google Scholar

19. Ekwall, P.: Advances in Liquid Crystals, 1 (1975) 1.10.1016/B978-0-12-025001-1.50007-XSearch in Google Scholar

20. Luzzati, V., Mustacchi, H., Skoulios, A. and Husson, F.: Acta Cryst.13 (1960) 660667. 10.1107/S0365110X60001564Search in Google Scholar

21. Handbook of Chemistry and Physics 69th, CRC Press. 1988–1989.Search in Google Scholar

22. Martin, J. S. and Rosch, M. (Ed).: Surfactant Sciences Series, Dekker, 1 (1966) 753793.Search in Google Scholar

23. Kunieda, H., Umizu, G. and Yamaguchi, Y.: J. Colloid Interface Sci.218 (1999) 8896. 10.1006/jcis.1999.6400Search in Google Scholar PubMed

24. Carvell, M., Hall, D. G., Lyle, I. G. and Tiddy, G. J. T.: Faraday Discuss. Chem. Soc.81 (1986) 223237. 10.1039/dc9868100223Search in Google Scholar PubMed

25. Sottmann, T., Strey, R. and Chen, H.-S.: J. Chem. Phys.106 (1997) 6483. 10.1063/1.473638Search in Google Scholar

26. Mackay, R. A. and Shick, M. J. (Ed).: Surfactant Science Series, Dekker, 23 (1987) 297368.Search in Google Scholar

27. Buzier, M.: Thèse d'Etat, Université de Nancy I (1984).Search in Google Scholar

Received: 2009-11-26
Published Online: 2013-04-05
Published in Print: 2010-11-01

© 2010, Carl Hanser Publisher, Munich

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