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

  • M. Alibrahim
Veröffentlicht/Copyright: 5. April 2013
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Tenside Surfactants Detergents
Aus der Zeitschrift Tenside Surfactants Detergents Band 47 Heft 6

Abstract

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.

Kurzfassung

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.

Key words:: Surfactant; liquid crystal; small angle x-ray scattering; ionic-nonionic mixture
Stichwörter:: Tensid; Flüssigkristall; Kleinwinkelröntgenstreuung; ionisch-nicht ionische Mischung
∗ 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.

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

© 2010, Carl Hanser Publisher, Munich

Artikel in diesem Heft

  1. Contents/Inhalt
  2. Contents
  3. Abstracts
  4. Abstracts
  5. Application
  6. Application of Neem and Karanjia Oils as Natural Pesticide Microemulsion Systems
  7. Environmental Chemistry
  8. Pronounced Catalytic Effect of Micellar Solution of Surfactants for Regioselective Alkylation of 4,5-Di- and 3,4,5-Triphenylimidazoles-2-thione
  9. Novel Surfactants
  10. Synthesis and Application of the Cationic Lignin Amine Flocculant
  11. Physical Chemistry
  12. Phase Behaviour of the Microemulsion Systems Formed by the Composite Surfactants Alkyl Polyglucoside and Sodium Dodecyl Sulfate
  13. Study of Micellization and Partition Balances of Acyl Stobadine Derivatives
  14. Effect of Non-electrolytes on the Cloud Point and Dye Solubilization of Antidepressant Drug, Clomipramine Hydrochloride
  15. A Structural Study of Two Oxyethylene Alkyl Ether-Water Mesophase Systems in the Presence of Small Amount of Sodium Dodecyl Sulphate, SDS Ionic Surfactant
  16. Synthesis
  17. Synthesis and Performance of 2,3-Bis(stearoloxy)-propyltrimethylamine Quaternary
  18. Cleaning Technology
  19. Cleaning Effect of Household Laundry Detergents at Low Temperatures
https://doi.org/10.3139/113.110094
Schlagwörter für diesen Artikel
Surfactant; liquid crystal; small angle x-ray scattering; ionic-nonionic mixture

Artikel in diesem Heft

  1. Contents/Inhalt
  2. Contents
  3. Abstracts
  4. Abstracts
  5. Application
  6. Application of Neem and Karanjia Oils as Natural Pesticide Microemulsion Systems
  7. Environmental Chemistry
  8. Pronounced Catalytic Effect of Micellar Solution of Surfactants for Regioselective Alkylation of 4,5-Di- and 3,4,5-Triphenylimidazoles-2-thione
  9. Novel Surfactants
  10. Synthesis and Application of the Cationic Lignin Amine Flocculant
  11. Physical Chemistry
  12. Phase Behaviour of the Microemulsion Systems Formed by the Composite Surfactants Alkyl Polyglucoside and Sodium Dodecyl Sulfate
  13. Study of Micellization and Partition Balances of Acyl Stobadine Derivatives
  14. Effect of Non-electrolytes on the Cloud Point and Dye Solubilization of Antidepressant Drug, Clomipramine Hydrochloride
  15. A Structural Study of Two Oxyethylene Alkyl Ether-Water Mesophase Systems in the Presence of Small Amount of Sodium Dodecyl Sulphate, SDS Ionic Surfactant
  16. Synthesis
  17. Synthesis and Performance of 2,3-Bis(stearoloxy)-propyltrimethylamine Quaternary
  18. Cleaning Technology
  19. Cleaning Effect of Household Laundry Detergents at Low Temperatures
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