Enthalpies of dilution of dodecyl- and tetradecyl- trimethylammonium bromides in aqueous solutions of sodium bromide at elevated temperatures:

Technical Report · Tue Mar 01 04:00:00 EST 1988

OSTI ID:5354135

Lam, A C; Archer, D G

Enthalpies of dilution of dodecyl- and tetradecyl- trimethylammonium bromides in aqueous sodium bromide solutions have been measured from 323 to 448 K and from 373 to 448 K, respectively. Similar to results with no added electrolytes, the onset of micellization can only be characterized by a critical micelle concentration (CMC0 region of finite size and not by a single CMC. The addition of sodium bromide electrolyte shifts the CMC region to a smaller surfactant molality and reduces its diffuseness. For a given temperature, the midpoint of a CMC region and the total electrolyte molality follow a linear relationship on a log-log scale. The change in critical micelle concentration region with respect to added NaBr concentration was used to calcualte midellar ''counter-ion binding fractions.'' 23 refs., 5 figs., 6 tabs.

• Research Organization: National Inst. for Petroleum and Energy Research, Bartlesville, OK (USA)
• DOE Contract Number: FC22-83FE60149
• OSTI ID: 5354135
• Report Number(s): NIPER-304; ON: DE88001219
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
AMINES
AMMONIUM COMPOUNDS
AQUEOUS SOLUTIONS
BROMIDES
BROMINE COMPOUNDS
DILUTION
DISPERSIONS
ELECTROLYTES
ENERGY SOURCES
ENHANCED RECOVERY
ENTHALPY
EQUATIONS
FOSSIL FUELS
FUELS
HALIDES
HALOGEN COMPOUNDS
MEDIUM PRESSURE
MEDIUM TEMPERATURE
MICELLAR SYSTEMS
MIXTURES
ORGANIC BROMINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PETROLEUM
PHYSICAL PROPERTIES
QUATERNARY COMPOUNDS
RECOVERY
SODIUM BROMIDES
SODIUM COMPOUNDS
SOLUTIONS
SURFACTANTS
THERMODYNAMIC ACTIVITY
THERMODYNAMIC PROPERTIES