Tuning the Contour Lengths and Persistence Lengths of Cationic Micelles: The Role of Electrostatics and Specific Ion Binding
| Autor: | Linda J. Magid, Z. Li, Paul Butler, and Z. Han |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
inorganic chemicals
chemistry.chemical_classification technology industry and agriculture Cationic polymerization Charge density macromolecular substances Electrostatics Micelle Surfaces Coatings and Films Ion binding chemistry Pulmonary surfactant Chemical physics Materials Chemistry Organic chemistry Micellar cubic lipids (amino acids peptides and proteins) Physical and Theoretical Chemistry Counterion |
| Zdroj: | The Journal of Physical Chemistry B. 104:6717-6727 |
| ISSN: | 1520-5207 1520-6106 |
| Popis: | Small-angle scattering has been used to obtain detailed information on micellar contour lengths and persistence lengths, a measure of micellar flexibility, for mixed micelles of cetyltrimethylammonium 2,6-dichlorobenzoate and cetyltrimethylammonium chloride in water as a function of surfactant and salt concentrations and the relative amounts of the two counterions (the counterion inventory) at the micellar surface. Increasing amounts at the surface of the penetrating counterion of the pair, 2,6-dichlorobenzoate, lowers the 1D bending modulus of the micelles, making them more flexible. Micellar contour lengths exhibit a maximum with increasing amounts of 2,6-dichlorobenzoate at the micellar surface. This is understood in terms of decreases in the micellar end-cap energies, Ec, at high concentrations of penetrating counterion. By decreasing the effective micellar surface charge density, penetrating counterions also cause decreased contributions from electrostatic repulsion, Ee, which retard micellar growth.... |
| Databáze: | OpenAIRE |
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