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Additive Effects on the Microstructure Evolution in Hexadecyltrimethylammonium Bromide Solution and Its Rheological
1Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, Kusong-dong 373-1, Taejon, Yusong-ku, 305-701, Korea
Journal of Colloid and Interface Science
|November 21, 1997
Summary
Additives like heptanols and sodium salicylate alter hexadecyltrimethylammonium bromide micellar solutions. Primary heptanol effectively enhances micellar shape transitions, while sodium salicylate induces viscoelasticity and yield stress by forming worm-like micelles.
Area of Science:
- Colloid and Surface Chemistry
- Rheology
- Materials Science
Background:
- Surfactant solutions exhibit complex microstructures and non-Newtonian behaviors.
- Understanding additive effects is crucial for controlling micellar solution properties.
Purpose of the Study:
- Investigate how primary, secondary, tertiary heptanols, and sodium salicylate affect hexadecyltrimethylammonium bromide (CTAB) micellar solutions.
- Characterize the impact of these additives on microstructure evolution and rheological properties.
Main Methods:
- Phase modulated flow birefringence
- Dynamic light scattering
- Dynamic oscillatory rheometry
Main Results:
- Additives enhance microstructure transitions, influenced by concentration and chemical structure.
- Heptanols, acting as cosurfactants, reduce repulsion by forming mixed micelles; primary heptanol is most effective.
- Sodium salicylate induces viscoelasticity and yield stress via networked or worm-like micelle formation.
Conclusions:
- Additives significantly modify CTAB micellar solution behavior.
- Primary heptanol promotes shape transitions more effectively than other heptanols.
- Sodium salicylate leads to distinct viscoelastic properties through worm-like micelle formation.