Counter ion condensation on mixed cationic/nonionic micellar systems: Bjerrum's electrostatic condition
| Autor: | M. H. Mannebach, Claude Treiner |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
chemistry.chemical_classification
Cloud point Polymers and Plastics Inorganic chemistry Solvation Ion-association Micelle chemistry.chemical_compound Colloid and Surface Chemistry chemistry Bromide Counterion condensation Triton X-100 Materials Chemistry Physical and Theoretical Chemistry Counterion |
| Zdroj: | Colloid & Polymer Science. 268:88-95 |
| ISSN: | 1435-1536 0303-402X |
| DOI: | 10.1007/bf01410429 |
| Popis: | The association of counter-ions with mixed ionic/nonionic micelles has been investigated in the case of dodecyl/tetradecyl/ and hexadecyl-trimethylammonium bromide with two nonionic surfactants: dodecylpolyoxyethylene 23 and Triton X-100. The degree of association has been measured by potentiometry using a Bromide ion-selective electrode. Previous results with sodium and copper dodecylsulfate suggesting that in the nonionic-rich composition domain, bare mixed micelles are formed without associated counter-ions have been confirmed. These results are in agreement with the prediction of Bjerrum's condition for ion association. The effect of copper dodecylsulfate on the cloud point of Triton X-100 has also been determined as a means of investigating mixed micelles with multivalent counter-ions. The dramatic cloud point increase observed, even larger than with sodium dodecylsulfate, has been discussed as evidence of the solvation of divalent ions by ether groups, a factor which complicates the analysis of multivalent counterion condensation on mixed micelles. |
| Databáze: | OpenAIRE |
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