Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 332, Issue 2, Pages 366-372Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2008.12.022
Keywords
J-aggregate; Cyanine dye; Aggregation; Reverse micelle; Surfactant; AOT; w/o microemulsion
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Funding
- Federal Program on R & D in Priority Areas of Russian Science and Technology [02.513.11.3166]
- 6th European Framework Project [EU FP6, STRP 013698, SA-NANO]
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We investigate the behavior of J-aggregates of a cyanine dye, 3,3'-di-(y-sulfopropyl)-4,5,4'.5'-dibenzo-9-ethylthiacarbocyanine betaine pyridinium salt, in AOT/water/hexane reverse micelles (W = 2-50), both during the course of rapid microemulsion formation and then after stabilization of the microemulsions at thermodynamic equilibrium. We suggest a new mechanism for J-aggregate formation in reverse micelle solutions. According to this model J-aggregates are formed in the aqueous phase prior to formation of a stable microemulsion, rather than in the process of intermicellar exchange. Reverse micelles encapsulate only those J-aggregates whose size is smaller than the mean size of the water pool. Larger J-aggregates located in hexane gradually precipitate from solution. It is demonstrated that micellar solutions can be used as sieves for selection and stabilization of J-aggregates with a desired size. (c) 2008 Elsevier Inc. All rights reserved.
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