Disconnected lamellar phases in pseudobinary water–non-ionic surfactant systems: A general phenomenon
| Autor: | Cosima Stubenrauch, Hironobu Kunieda, Dharmesh Varade, Reinhard Strey |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Materials science
Non ionic Small-angle X-ray scattering Ether Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound Crystallography Colloid and Surface Chemistry Pulmonary surfactant chemistry Lamellar phase Phase (matter) Lamellar structure Phase diagram |
| Zdroj: | Journal of Colloid and Interface Science. 300:338-347 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2006.03.083 |
| Popis: | This study provides new experimental evidence for the disconnection of the lamellar phase ( L α ) in pseudobinary water–non-ionic surfactant systems. To prove that the disconnection is indeed a general phenomenon the phase behavior of the pseudobinary system water–pentaethylene glycol dodecyl ether/hexaethylene glycol dodecyl ether (H 2 O–C 12 E 5 /C 12 E 6 ) was investigated as a function of the surfactant composition δ and the total surfactant concentration γ . At a fixed γ of 0.10 the extension of the highly diluted L α phase shrank continuously with increasing amount of C 12 E 6 , i.e., increasing δ , until it disappeared at δ = 0.60 . The γ – T phase diagram of this particular surfactant mixture was found to have a disconnected L α phase. For the first time, SAXS measurements were carried out to monitor structural changes related to the disconnection. For this purpose the interlayer spacing d and the effective cross-sectional area a s were determined from the SAXS data along characteristic paths through the L α phase. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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