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- W1991336810 abstract "The micelle shuttle utilizing block copolymer micelles as nanocarriers for transportation between water and a hydrophobic ionic liquid, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIM][TFSI]), is examined in detail. Rhodamine B, a dye with a high molar absorptivity and fluorescence quantum yield, is conjugated to a short poly(1,2-butadiene) homopolymer and then loaded in amphiphilic poly((1,2-butadiene)-block-ethylene oxide) (PB−PEO) block copolymer micelles. The round-trip transportation of the micelles between water and the ionic liquid is simply triggered by temperature; it is fully reversible, quantitative, and without leakage. Quantitative fluorescence analysis reveals that the micelle distribution in the biphasic system has a very strong temperature dependence, which is favorable for control of the transportation. The standard Gibbs free energy change (ΔG°), standard enthalpy change (ΔH°), and standard entropy change (ΔS°) of the micelle shuttle are extracted from the temperature dependence of the micelle distribution. Both ΔH° and ΔS° are positive, indicating an entropy-driven process. The slow yet spontaneous micelle shuttle is explored under quiescent conditions to understand the transfer kinetics. Both of the two-way transfers involve three steps, formation of micelle-concentrated [EMIM][TFSI]/water droplets in the initial phase, sedimentation/creaming of the droplets to the interface, and diffusion of the micelles to the destination phase. A detailed mechanism for the transfer is therefore proposed." @default.
- W1991336810 created "2016-06-24" @default.
- W1991336810 creator A5021121847 @default.
- W1991336810 creator A5029326074 @default.
- W1991336810 date "2009-10-01" @default.
- W1991336810 modified "2023-10-16" @default.
- W1991336810 title "Thermodynamics and Mechanism of the Block Copolymer Micelle Shuttle between Water and an Ionic Liquid" @default.
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- W1991336810 doi "https://doi.org/10.1021/jp907059q" @default.
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