title: Influence of Corona Structure on Binding of an Ionic Surfactant in Oppositely Charged Amphiphilic Polyelectrolyte Micelles.
abstract: Interaction of polystyrene-block-poly(methacrylic acid) micelles (PS-PMAA) with cationic surfactant N-dodecylpyridinium chloride (DPCl) in alkaline aqueous solutions was studied by static and dynamic light scattering, SAXS, cryogenic transmission electron microscopy (cryo-TEM), isothermal titration calorimetry (ITC), and time-resolved fluorescence spectroscopy. ITC and fluorescence measurements show that there are two distinct regimes of surfactant binding in the micellar corona (depending on the DPCl content) caused by different interactions of DPCl with PMAA in the inner and outer parts of the corona. The compensation of the negative charge of the micellar corona by DPCl leads to the aggregation of PS-PMAA micelles, and the micelles form colloidal aggregates at a certain critical surfactant concentration. SAXS shows that the aggregates are formed by individual PS-PMAA micelles with intact cores and collapsed coronas interconnected with surfactant micelles by electrostatic interactions. Unlike polyelectrolyte-surfactant complexes formed by free polyelectrolyte chains, the PMAA/DPCl complex with collapsed corona does not contain surfactant micelles.
authors.affiliation: Department of Physical and Macromolecular Chemistry, Faculty of Science Charles University in Prague , Hlavova 2030, 12840 Prague 2, Czech Republic.
authors.forename: Foteini
authors.initials: F
authors.lastname: Delisavva
authors.affiliation: Department of Physical and Macromolecular Chemistry, Faculty of Science Charles University in Prague , Hlavova 2030, 12840 Prague 2, Czech Republic.
authors.forename: Mariusz
authors.initials: M
authors.lastname: Uchman
authors.affiliation: Department of Physical and Macromolecular Chemistry, Faculty of Science Charles University in Prague , Hlavova 2030, 12840 Prague 2, Czech Republic.
authors.forename: Juraj
authors.initials: J
authors.lastname: Škvarla
authors.affiliation: Department of Physical and Macromolecular Chemistry, Faculty of Science Charles University in Prague , Hlavova 2030, 12840 Prague 2, Czech Republic.|Department of Chemistry, The Faculty of Food Science, Wrocław University of Environmental and Life Sciences , C. K. Norwida 25, 50-375 Wrocław, Poland.
authors.forename: Edyta
authors.initials: E
authors.lastname: Woźniak
authors.affiliation: Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovský Sq. 2, 16206 Prague 6, Czech Republic.
authors.forename: Ewa
authors.initials: E
authors.lastname: Pavlova
authors.affiliation: Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovský Sq. 2, 16206 Prague 6, Czech Republic.
authors.forename: Miroslav
authors.initials: M
authors.lastname: Šlouf
authors.affiliation: Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research , D-21502 Geesthacht, Germany.
authors.forename: Vasil M
authors.initials: VM
authors.lastname: Garamus
authors.affiliation: Department of Physical and Macromolecular Chemistry, Faculty of Science Charles University in Prague , Hlavova 2030, 12840 Prague 2, Czech Republic.
authors.forename: Karel
authors.initials: K
authors.lastname: Procházka
authors.affiliation: Department of Physical and Macromolecular Chemistry, Faculty of Science Charles University in Prague , Hlavova 2030, 12840 Prague 2, Czech Republic.
authors.forename: Miroslav
authors.initials: M
authors.lastname: Štěpánek