Excess enthalpies of solution of primary and secondary alcohols in dodecyldimethylamine oxide micellar solutions
The excess enthalpies of solution with respect to water of some primary and secondary alcohols in dodecyldimethylamine oxide (DDAO) micellar solutions were measured by mixing aqueous solutions of alcohols with surfactant solutions. Standard free energies, enthalpies and entropies were obtained from the distribution of alcohol between aqueous and micellar phases. It is shown that thermodynamics of transfer of secondary alcohols from aqueous to the DDAO micellar phase differ slightly from those of their corresponding primary alcohols, that the additivity rule holds for free energies of transfer and that enthalpy and entropy display convex curves. The present data are compared with those from the aqueous to the dodecyltrimethylammonium bromide (DTAB) micellar phases and to the literature data for transfer from water to octane. The role of the hydrophilic interactions between OH group and the micellar head groups and of the hydrophobic interactions between the methylene group and its apolar environment is evidenced.
- Research Organization:
- Universita di Palermo (Italy)
- OSTI ID:
- 6977729
- Journal Information:
- J. Solution Chem.; (United States), Vol. 16:11
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALCOHOLS
SOLUTION HEAT
AMINES
AMMONIUM HALIDES
AQUEOUS SOLUTIONS
BINDING ENERGY
BUTANOLS
CALORIMETRY
ENTROPY
ETHANOL
FREE ENERGY
HEXANOLS
METHANOL
MICELLAR SYSTEMS
ORGANIC SOLVENTS
PENTANOLS
PROPANOLS
QUATERNARY COMPOUNDS
SOLVENT PROPERTIES
SURFACTANTS
THERMODYNAMICS
WATER
AMMONIUM COMPOUNDS
DISPERSIONS
ENERGY
ENTHALPY
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
MIXTURES
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SOLUTIONS
SOLVENTS
THERMODYNAMIC PROPERTIES
400201* - Chemical & Physicochemical Properties