کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
610626 | 880654 | 2009 | 7 صفحه PDF | دانلود رایگان |
We investigate the behavior of J-aggregates of a cyanine dye, 3,3′3,3′-di-(γ -sulfopropyl)-4,5,4′,5′4,5,4′,5′-dibenzo-9-ethylthiacarbocyanine betaine pyridinium salt, in AOT/water/hexane reverse micelles (W=2–50W=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.
Reverse micelle solutions can be used as “sieves” for selection and stabilization of J-aggregates with a desired size: micelles encapsulate J-aggregates whose size is smaller than the water pool size.Figure optionsDownload as PowerPoint slide
Journal: Journal of Colloid and Interface Science - Volume 332, Issue 2, 15 April 2009, Pages 366–372