Journal
COLLOID AND POLYMER SCIENCE
Volume 288, Issue 12-13, Pages 1225-1232Publisher
SPRINGER
DOI: 10.1007/s00396-010-2254-2
Keywords
Ionic liquid; C(n)mimBr; EAN; Micelle; Thermodynamic; H-1 NMR
Categories
Funding
- National Natural Science Foundation of China [50972080, 20773081]
- National Basic Research Program [2007CB808004, 2009CB930101]
- Laboratory of Organic Optoelectronic Functional Materials and Molecular Engineering, TIPC, CAS.
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The aggregation behavior of long-chain imidazolium ionic liquids, 1-alkyl-3-methyl-imidazolium bromide (C(n)mimBr, n=12, 14, 16) was studied by surface tension measurements in a room temperature ionic liquid, ethylammonium nitrate (EAN), at various temperatures. A series of parameters including critical micelle concentration (cmc), surface tension at the cmc (gamma cmc), and the effectiveness of surface tension reduction (Pi(cmc)) were obtained. In addition, from the cmc values and their temperature dependence, we estimated the thermodynamic parameters of the micelle formation, Delta G(m)(0), Delta H-m(0), and Delta S-m(0). The contribution of enthalpy term to the micelle formation is superior to that of entropy term. H-1 NMR was performed to study the CnmimBr micelle formation mechanism in EAN.
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