Reversible Nanoparticle–Micelle Transformation of Ionic Liquid–Sulfonatocalix[6]arene Aggregates

Autor:	József G. Harangozó, Véronique Wintgens, László Biczók, Zsombor Miskolczy, Catherine Amiel, Jean Michel Guigner
Rok vydání:	2015
Předmět:	Exothermic reaction Inorganic chemistry Enthalpy Surfaces and Interfaces Condensed Matter Physics Endothermic process Heat capacity Micelle Isothermal process chemistry.chemical_compound Dynamic light scattering chemistry Ionic liquid Electrochemistry General Materials Science Spectroscopy
Zdroj:	Langmuir. 31:6655-6662
ISSN:	1520-5827 0743-7463
DOI:	10.1021/acs.langmuir.5b01683
Popis:	The effect of temperature and NaCl concentration variations on the self-assembly of 1-methyl-3-tetradecylimidazolium (C14mim(+)) and 4-sulfonatocalix[6]arene (SCX6) was studied by dynamic light scattering and isothermal calorimetric methods at pH 7. Inclusion complex formation promoted the self-assembly to spherical nanoparticles (NP), which transformed to supramolecular micelles (SM) in the presence of NaCl. Highly reversible, temperature-responsive behavior was observed, and the conditions of the NP-SM transition could be tuned by the alteration of C14mim(+):SCX6 mixing ratio and NaCl concentration. The association to SM was always exothermic with enthalpy independent of the amount of NaCl. In contrast, NPs were produced in endothermic process at low temperature, and the enthalpy change became less favorable upon increase in NaCl concentration. The NP formation was accompanied by negative molar heat capacity change, which further diminished when NaCl concentration was raised.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::93b3db607fe51eb07ae425b368cbb357 https://doi.org/10.1021/acs.langmuir.5b01683 Zobrazit plný text záznamu