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Nonionic-anionic mixed surfactants cubic mesophases. Part I: Structural chaotropic and kosmotropic effect
Rivka Efrat1, Zoya Abramov, Abraham Aserin
1Casali Institute of Applied Chemistry, Hebrew University of Jerusalem, Edmond J. Safra Campus, Jerusalem 91904, Israel.
The Journal of Physical Chemistry. B
|July 31, 2010
Summary
This study explores cubic bicontinuous phases formed by monoolein and oleyl lactate surfactants. The anionic surfactant
Area of Science:
- Materials Science
- Colloid and Surface Science
- Physical Chemistry
Background:
- Surfactant self-assembly into various mesophases is crucial for applications.
- Understanding the influence of surfactant structure and charge on phase behavior is key.
- Cubic bicontinuous phases (V) offer unique properties for encapsulation and delivery.
Purpose of the Study:
- To investigate the formation and structural characteristics of cubic bicontinuous (V) phases.
- To evaluate the impact of anionic surfactant charge and ratio on V phase formation.
- To elucidate the structural transitions and hydrocarbon order influenced by oleyl lactate.
Main Methods:
- Preparation and investigation of surfactant mixtures (monoolein and oleyl lactate) in ethanol and water.
- Construction of pseudoternary phase diagrams to identify isotropic V regions.
- Structural characterization using small-angle X-ray spectroscopy, differential scanning calorimetry, and Fourier transform infrared spectroscopy.
Main Results:
- The largest swollen V region was achieved with partially neutralized oleyl lactate (OL) at a 70:30 GMO/OL ratio.
- Phase transitions from gyroid (G) to diamond (D) symmetry were observed at 90:10 GMO/OL.
- A coexistence of cubic and lamellar phases was found at 30:70 GMO/OL, with decreased hydrocarbon order as OL content increased.
Conclusions:
- Anionic surfactant charge and concentration significantly influence cubic bicontinuous phase formation and extent.
- The structural properties of the V phase are curvature-dependent and sensitive to surfactant composition.
- Oleyl lactate exhibits a chaotropic effect, disrupting water structure and influencing hydrocarbon chain order.
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