Effect of Counterion Structure on Micellar Growth of Alkylpyridinium Surfactants in Aqueous Solution
| Autor: | K Bijma, Jan B. F. N. Engberts, Elisabeth Rank |
|---|---|
| Přispěvatelé: | Faculty of Science and Engineering, Stratingh Institute of Chemistry, Synthetische Organische Chemie, Moleculaire Anorganische Chemie |
| Rok vydání: | 1998 |
| Předmět: |
inorganic chemicals
Isothermal microcalorimetry CETYLTRIMETHYLAMMONIUM BROMIDE micelles growth Inorganic chemistry Substituent Micelle Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry Pulmonary surfactant CONCENTRATED NACL SOLUTIONS counterions Polymer chemistry NABR SOLUTIONS GeneralLiterature_REFERENCE(e.g. dictionaries encyclopedias glossaries) chemistry.chemical_classification Aqueous solution alkylpyridinium surfactants VISCOELASTICITY SODIUM-SALICYLATE microcalorimetry NMR LIGHT-SCATTERING Surfaces Coatings and Films Electronic Optical and Magnetic Materials TO-ROD TRANSITION Monomer chemistry Hydroxybenzoate ComputingMethodologies_DOCUMENTANDTEXTPROCESSING Counterion DODECYLDIMETHYLAMMONIUM CHLORIDE SULFATE DODECYLTRIMETHYLAMMONIUM |
| Zdroj: | Journal of Colloid and Interface Science, 205(2), 245-256. ACADEMIC PRESS INC ELSEVIER SCIENCE |
| ISSN: | 1095-7103 0021-9797 |
| Popis: | This paper describes the influence of counterions on the unidirectional growth of micelles formed by alkylpyridinium surfactants in aqueous solution. It is shown that the growth of spherical micelles to form wormlike micelles is strongly dependent on counterion structure. More hydrophobic counterions induce the formation of wormlike micelles at lower surfactant concentrations. Next to hydrophobicity and the type of substituent, the substitution pattern of the aromatic ring plays the most important role in micellar growth. The formation of a network of entangled, elongated wormlike micelles by alkylpyridinium surfactants with o-hydroxybenzoate and p-chlorobenzoate counterions is discussed in terms of surfactant structure. It is concluded that, next to counterion structure, the microenvironment of the counterion (substituent) in the Stern region and the structure of the surfactant monomer (i.e., the surfactant cation) play the most important role in the formation of these elongated wormlike micelles. Headgroup effects are proposed to be the main driving force for this phenomenon. Copyright 1998 Academic Press. |
| Databáze: | OpenAIRE |
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