Precipitation of mixtures of anionic and cationic surfactants; 3: Effect of added nonionic surfactant

Journal Article · Sat Oct 15 04:00:00 EDT 1994 · Journal of Colloid and Interface Science; (United States)

DOI:https://doi.org/10.1006/jcis.1994.1368· OSTI ID:6818943

Shiau, B J; Harwell, J H; Scamehorn, J F ^[1]

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1. Univ. of Oklahoma, Norman, OK (United States). Inst. for Applied Surfactant Research

The precipitation of an anionic surfactant by a cationic surfactant in the presence of a nonionic surfactant is examined. The precipitation domains for sodium dodecyl sulfate/dodecyl-pyridinium chloride were measured over a wide range of surfactant concentrations as a function of nonylphenol polyethoxylate concentration. Increasing the nonylphenol polyethoxylate concentration decreases the tendency for precipitation to occur. A model for predicting precipitation domains in ternary surfactant mixtures has been developed and verified experimentally. The model allows the nonionic surfactant to affect the precipitation behavior only by lowering the critical micelle concentration of the mixture. Small deviations between theory and experiments along part of the anionic-rich micelle boundary result from adsorption of SDS on the precipitate which gives the microcrystals a negative charge and prevents their growth to a visible size.

• DOE Contract Number: FG05-87ER13678
• OSTI ID: 6818943
• Journal Information: Journal of Colloid and Interface Science; (United States), Journal Name: Journal of Colloid and Interface Science; (United States) Vol. 167:2; ISSN 0021-9797; ISSN JCISA5
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADDITIVES
ALKALI METAL COMPOUNDS
AMINES
AMMONIUM COMPOUNDS
AROMATICS
AZINES
CONCENTRATION RATIO
HETEROCYCLIC COMPOUNDS
HYDROXY COMPOUNDS
MATHEMATICAL MODELS
MICELLAR SYSTEMS
MOLECULAR STRUCTURE
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PH VALUE
PHENOLS
PRECIPITATION
PYRIDINES
PYRIDINIUM COMPOUNDS
QUATERNARY COMPOUNDS
SEPARATION PROCESSES
SODIUM COMPOUNDS
SODIUM SULFATES
SULFATES
SULFUR COMPOUNDS
SURFACTANTS
TEMPERATURE DEPENDENCE