ISSN:
1435-1536
Keywords:
Sound velocity
;
nonionic aqueous solutions
;
interactions
;
enthalpy of mixing
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract We carried out ultrasonic velocity measurements in some aqueous solutions of the nonionic dodecylhexaethylene oxide surfactant in a wide temperature range (5–55°C) and in a concentration range extending from the critical one up to the hexagonal mesomorphic phase. Using an early thermodynamic approach by Kudriavtsev, we explored the possibility of a direct linking between the excess squared sound velocity and the heat of mixing of the solutions via the potential energy of the system. This approach looks promising, as confirmed by its application even to polypropylene glycol (PEG)-water solutions. The different values of the fitting parameters in the two systems suggest that the solute-solvent interaction in the case of surfactant solutions is mainly due to the presence of extended aggregates, whereas in PEG solution it is due to the direct oxirane-groups-water pair potential.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01188963
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