Effect of Headgroup Variation on the Self-Assembly of Cationic Surfactants with Sulfonatocalix[6]arene
| Autor: | József G. Harangozó, Zsombor Miskolczy, Jean-Michel Guigner, Catherine Amiel, László Biczók, Véronique Wintgens |
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| Rok vydání: | 2017 |
| Předmět: |
Aqueous solution
Chemistry Supramolecular chemistry Substituent Cationic polymerization 02 engineering and technology Surfaces and Interfaces 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Micelle 0104 chemical sciences chemistry.chemical_compound Pulmonary surfactant Polymer chemistry Amphiphile Electrochemistry Organic chemistry General Materials Science Pyridinium 0210 nano-technology Spectroscopy |
| Zdroj: | Langmuir : the ACS journal of surfaces and colloids. 33(32) |
| ISSN: | 1520-5827 |
| Popis: | The effect of headgroup variation on the association of supramolecular amphiphiles composed of 4-sulfonatocalix[6]arene (SCX6) and cationic surfactant possessing tetradecyl substituent was studied in aqueous solutions at pH 7. When the surfactant contained hydrophilic trimethylammonium, pyridinium, or 1-methylimidazolium headgroup, highly reversible temperature-responsive nanoparticle–supramolecular micelle transformation could be attained at appropriately chosen component mixing ratios and NaCl concentrations. In these cases, the substantial negative molar heat capacity change (ΔCp) rendered nanoparticle formation strongly endothermic at low temperature, whereas the assembly to supramolecular micelle was always accompanied by enthalpy gain. The ΔCp values became less negative when the charge density and the hydrophilic character of the surfactant headgroup diminished. The association of the more hydrophobic 6-methoxyquinolinium and quinolinium surfactants with SCX6 did not lead to supramolecular micelle ... |
| Databáze: | OpenAIRE |
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