Enthalpies of solution and volumes of water in reversed AOT micelles

Journal Article · Thu Aug 27 00:00:00 EDT 1987 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100302a022· OSTI ID:6087162

D'Aprano, A; Lizzio, A; Liveri, V T

Molar enthalpies of solution and apparent molar volumes of water in the sodium bis(2-ethylhexyl) sulfosuccinate (AOT)/n-heptane system as a function of the molar ratio R = (water)/(AOT) were determined at 25 /sup 0/C. The dependence of these experimental data on R has been rationalized in terms of a semiempirical model based on water partitioning between two states. The positive enthalpies of solution of water indicate that the insertion of water in reversed AOT micelles (unfavorable from an enthalpic point of view) is mainly driven by a favorable change on entropy. An increase of the maximum number of water molecules solvating AOT with increasing concentration of surfactant has also been observed and discussed.

• Research Organization: Universita di Palermo, Italy
• OSTI ID: 6087162
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 91:18; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKANES
CARBOXYLIC ACID SALTS
DATA
ENTHALPY
ENTROPY
EXPERIMENTAL DATA
HEPTANE
HYDROCARBONS
HYDROGEN COMPOUNDS
INFORMATION
MATHEMATICAL MODELS
MEDIUM TEMPERATURE
MICELLAR SYSTEMS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SOLUTION HEAT
THERMODYNAMIC PROPERTIES
THERMODYNAMICS
VOLUME
WATER