Isobaric heat capacities of micelle formation by 1-methyl-4-n-dodecyl-pyridinium iodide in aqueous solution; Effects of added urea
| Autor: | Willem posthumus, K Bijma, Michael J. Blandamer, Jan B. F. N. Engberts |
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| Rok vydání: | 1997 |
| Předmět: |
chemistry.chemical_classification
Aqueous solution MODELS Inorganic chemistry Iodide Enthalpy TITRATION BROMIDE Condensed Matter Physics Heat capacity Micelle Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry SYSTEMS Critical micelle concentration THERMODYNAMICS Materials Chemistry Urea WATER Isobaric process CHAINS Physical and Theoretical Chemistry Spectroscopy |
| Zdroj: | Journal of Molecular Liquids, 73-74, 91-97. Elsevier |
| ISSN: | 0167-7322 |
| DOI: | 10.1016/s0167-7322(97)00059-7 |
| Popis: | Over the temperature range from 303 to 333 K, the enthalpy of micelle formation by 1-methyl-4-n-dodecylpyridinium iodide in aqueous solution is exothermic, characterised by an isobaric heat capacity of micelle formation equal to -439 +/- 10 J K-1 mol(-1). At 303 K, the critical micellar concentration (2.8 x 10(-3) mol dm(-3)) increases when urea, 4 mol kg(-1) and X mol kg(-1) is added. Surprisingly, the isobaric heat capacity of micelle formation is unaffected although micelle formation is slightly less exothermic compared to that recorded for aqueous solutions. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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