Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 113, Issue 21, Pages 7498-7504Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp811455f
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Funding
- National Natural Science Foundation of China [20873001, 20633010, 50821061]
- National Basic Research Program of China [2007CB936201]
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Controllable aggregate transitions are achieved in this work by adding due amounts of beta-cyclodextrin (beta-CD) to mixed cationic/anionic surfactant aqueous solutions. In contrast to its aggrecrate breaking effect in single surfactant systems, aggregate growth is observed in nonstoichiometrical mixed cationic/anionic surfactant systems upon addition of beta-CD. The aggregate growth typically undergoes a micellar elongation and a following micelle-to-vesicle transition, which in turn greatly influences the viscosity and absorbance of the solutions. A possible mechanism of this beta-CD-induced aggregate growth is proposed. In mixed cationic/anionic surfactant systems, the surfactants strongly tend to reach electroneutral equilibrium in aggregates. In the present case, added beta-CD is found to greatly facilitate the equilibrium by transferring the major component (whose molar fraction > 0.5) of a cationic/anionic surfactant mixture from the aggregates to beta-CD cavities. Consequently, the surfactants in the aggregates approach electroneutral mixing, in favor of low-curved aggregates such as vesicles. This work shows that beta-CD provides an additional degree of freedom to control microstructures and macroproperties for the whole class of mixed cationic/anionic surfactant systems.
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