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Gemini surfactants with a disaccharide spacer
1Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA.
Journal of the American Chemical Society
|July 18, 2001
Summary
Two new families of gemini surfactants with trehalose spacers were synthesized. Series-A geminis formed insoluble structures, while Series-B geminis formed soluble micelles, explained by molecular modeling.
Area of Science:
- Colloid and Surface Chemistry
- Supramolecular Chemistry
- Materials Science
Background:
- Gemini surfactants, characterized by two hydrophilic head groups and two hydrophobic tails linked by a spacer, have garnered significant interest.
- Trehalose, a non-reducing disaccharide, offers unique structural and functional properties for amphiphile design.
Purpose of the Study:
- To synthesize and characterize two novel families of gemini surfactants utilizing trehalose as a polar spacer.
- To investigate the influence of structural modifications (nonionic vs. cationic) on the self-assembly behavior and physicochemical properties of these gemini surfactants.
Main Methods:
- Synthesis of nonionic (Series-A) and cationic (Series-B) gemini surfactants with trehalose.
- Characterization using calorimetry, tensiometry, conductance measurements, microscopy, surface balance studies, and light scattering.
- Molecular modeling with the Amber force field to elucidate structure-property relationships.
Main Results:
- Series-A geminis, despite hydrophilic groups, exhibited water insolubility and formed vesicular and tubular structures, mimicking phospholipids.
- Series-B geminis demonstrated water solubility and formed micelles with significantly lower critical micelle concentrations than conventional surfactants.
- Molecular modeling indicated tubular shape for Series-A favoring bilayer packing and conical shape for Series-B favoring micelle formation.
Conclusions:
- The nature of the head group (amide vs. quaternary ammonium) critically dictates the self-assembly behavior and solubility of trehalose-based gemini surfactants.
- Trehalose can function as a substantial headgroup, influencing packing parameters and aggregate morphology.
- Consilience among multiple experimental and computational methods is crucial for a comprehensive understanding of complex surfactant systems.
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