Université de Fribourg

Environment-sensitive stabilisation of silver nanoparticles in aqueous solutions

Voets, Ilja K. ; Keizer, Arie de ; Frederik, Peter M. ; Jellema, Reint ; Cohen Stuart, Martien A.

In: Journal of Colloid and Interface Science, 2009, vol. 339, no. 2, p. 317-324

We describe the preparation and characterisation of inorganic–organic hybrid block copolymer silver nanoparticles via the preparation of spherical multi-responsive polymeric micelles of poly(N-methyl-2-vinyl pyridinium iodide)-block-poly(ethylene oxide), P2MVP₃₈-b-PEO₂₁₁ and poly(acrylic acid)-block-poly(isopropyl acrylamide),...

Université de Fribourg

Electrostatic hierarchical co-assembly in aqueous solutions of two oppositely charged double hydrophilic diblock copolymers

Voets, Ilja K. ; Keizer, Arie de ; Leermakers, Frans A.M. ; Debuigne, Antoine ; Jérôme, Robert ; Detrembleur, Christophe ; Cohen Stuart, Martien A.

In: European Polymer Journal, 2009, vol. 45, no. 10, p. 2913-2925

The formation of spherical micelles in aqueous solutions of poly(N-methyl-2-vinyl pyridinium iodide)-block-poly(ethylene oxide), P2MVP-b-PEO and poly(acrylic acid)-block-poly(vinyl alcohol), PAA-b-PVOH has been investigated with light scattering-titrations, dynamic and static light scattering, and ¹H 2D Nuclear Overhauser Effect Spectroscopy. Complex coacervate...

Université de Fribourg

Multiresponsive reversible gels based on charge-driven assembly

Lemmers, Marc ; Sprakel, Joris ; Voets, Ilja K. ; Gucht, Jasper van der ; Stuart, Martien A. Cohen

In: Angewandte Chemie International Edition, 2010, vol. 49, no. 4, p. 708 - 711

Coassembly of an ABA triblock copolymer with charged end blocks and an oppositely charged polyelectrolyte yields gels that respond to changes in concentration, temperature, ionic strength, pH value, and charge composition. Above the critical gel concentration, the triblock copolymers bridge micelles, forming a sample-spanning transient network of interconnected micelles.

Université de Fribourg

Towards a structural characterization of charge-driven polymer micelles

Voets, Ilja K. ; Vries, Renko de ; Fokkink, Remco ; Sprakel, Joris ; May, Roland P. ; Keizer, Arie de ; Cohen Stuart, Martien A.

In: The European Physical Journal E, 2009, vol. 30, no. 4, p. 351-359

Light scattering and small-angle neutron scattering experiments were performed on comicelles of several combinations of oppositely charged (block co)polymers in aqueous solutions. Fundamental differences between the internal structure of this novel type of micelle --termed complex coacervate core micelle (C3Ms), polyion complex (PIC) micelle, block ionomer complex (BIC), or interpolyelectrolyte...