THERMODYNAMICS OF MICELLE FORMATION BY 1-METHYL-4-ALKYLPYRIDINIUM HALIDES

Jazyk:	angličtina
Rok vydání:	1994
Předmět:	CELLULAR-SYSTEMS CHEMICAL-STRUCTURE TITRATION MODEL ALKYLARENESULFONATES TETRADECYLTRIMETHYLAMMONIUM MICROCALORIMETRY SODIUM DODECYL-SULFATE SURFACTANTS ENTHALPY MIXED MICELLIZATION
Zdroj:	Langmuir. 10(8):2578-2582
ISSN:	0743-7463
Popis:	This paper reports enthalpies of micellization for a series of 1-methyl-4-alkylpyridinium halide surfactants at 303.2 K with different lengths and degrees of branching of the 4-alkyl chain and different sizes of counterions using two microcalorimeters (LKB 2277 and Omega Microcal). The standard enthalpy of micellization (DELTAH-degrees(m)) becomes more exothermic with increasing chain length and with increasing size of the halide counterion. No trend could be observed with respect to the degree of branching of the alkyl chain. Critical micelle concentrations (cmc) were determined as a function of temperature using conductometry. These cmc values were used to calculate the standard Gibbs energy of micellization (DELTAG-degrees(m)) according to the phase separation model. From this we calculated the standard enthalpy of micellization (DELTAH-degrees(m)), which was compared with the microcalorimetric enthalpies of micellization.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=dris___00893::7d50d2faa176b550a21c702b01597a46 https://hdl.handle.net/11370/39d75bba-94b9-4d0f-90a5-46131a9d61c2 Zobrazit plný text záznamu