Calorimetric and counterion binding studies of the interactions between micelles and ions. The observation of lyotropic series
Heats of transfer of a variety of salts from water to solutions of hexadecyltrimethylammonium bromide (CTAB), dodecyltrimethylammonium bromide (DTAB), and sodium dodecyl sulfate (NaLS) were measured. Lyotropic series for both cations and anions were observed for all soaps, the series for the 2 cationic soaps being almost identical. The dependence of the observed heats of transfer for anions from H/sub 2/O to CTAB and DTAB solutions and for cations from H2O to NaLS solutions on the hydrated radii of the ions involved supports the contention that favorable binding of counterions depends on how closely they can approach the charged micellar surfaces. It is clear that a lyotropic series similar to that existing for proteins exists for ion binding to micelles. The controlling factor in this binding seems to be the distance of closest approach of the ion to the micelle, although polarizable organic ions may be the exceptions. Chain length has little effect on binding. It is felt that the work discussed has established the usefulness of a calorimetric investigation and the use of ion-specific electrodes for characterizing surfactant systems containing more than one species of counterions. (37 refs.)
- Research Organization:
- Univ. of Tennessee
- OSTI ID:
- 6803965
- Journal Information:
- J. Am. Chem. Soc.; (United States), Vol. 96:18
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
02 PETROLEUM
MICELLAR SYSTEMS
CALORIMETRY
ADSORPTION
CATIONS
CHEMICAL REACTIONS
ELECTRICITY
ENTHALPY
ENTROPY
OIL WELLS
PETROLEUM
SORPTION
SURFACTANTS
THERMAL ANALYSIS
WATERFLOODING
CHARGED PARTICLES
ENERGY SOURCES
FLUID INJECTION
FOSSIL FUELS
FUELS
IONS
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
WELLS
400201* - Chemical & Physicochemical Properties
020300 - Petroleum- Drilling & Production