Solute Exchange in Synperonic Surfactant Micelles
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Bibliographic record
Abstract
We describe experiments that examine the rates of solute exchange in micelles formed from the surfactants Synperonic A7 and Synperonic A50. These surfactants are linear alkane (mixed C 13 and C 15 ) ethoxylates with mean degrees of ethoxylation of 6.5 for A7 and 53.7 for A50. The solute is gycerol-1,2-distearate-3-pyrenebutyrate, 1 . Solutions containing on average 0.4 molecules of 1 per micelle show both excimer and monomer fluorescence. Excimer emission originates from micelles containing at least two pyrene chromophores. In A50, 1 forms aggregates that do not exchange on a time scale of weeks. When solutions of A7 are treated with an excess of empty micelles, the excimer fluorescence decays with a pseudo-first-order rate that depends on the concentration of empty micelles. Because 1 is so insoluble in water, its exchange involves either fusion of two micelles to form a short-lived supermicelle, or fragmentation of a micelle into submicelles, which then grow back to form normal micelles. The corresponding rate constants are k 2 = 8.7 × 10 4 M - 1 s - 1 for the second-order process and k 1 = 0.85 s - 1 for the first-order process. These rates are more than an order of magnitude slower than the rates of micelle fusion and fragmentation for Triton-X100 micelles (Rharbi et al. J. Am. Chem. Soc . 2000, 122, 6242) determined by the same technique. We discuss possible sources for these differences.
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| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.008 | 0.000 |
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