Oxidation-Responsive Emulsions Stabilized by Cleavable Metallo-Supramolecular Crosslinked Microgels

A recent paper from the Colloids, Assemblies and Interfacial Dynamics team (CAID team) reports on an original route to destabilize emulsions by oxidation of metallo-supramolecular microgels used as emulsifier. Our study paves the road to the discovery of unusual microgel properties as our proof-of-concept can be extended to different supramolecular chemistry and architecture.

Our advanced class of microgels emulsifiers containing stimulable metallo-supramolecular instead of frozen covalent crosslinks was built from poly(N-isopropylmethacrylamide) (PNiPMAM) chains connected by iron(II)-bis(terpyridine) coordination supramolecular complexes that can be cleaved on demand leading to unique properties both at interfaces and in volume. The microgels synthesis is undemanding and the characterization of their supramolecular structure can be precisely achieved by standard methods. Singularly, interfaces of an oil-in-water emulsion stabilized by the supramolecular particles can be triggered at molecular scale by oxidation of Fe(II) to Fe(III), leading to emulsion breaking. In bulk, we show that a microgel dispersion can indeed be transformed into a polymer solution upon oxidation.

To get more details on the topic:

« Reversible Assembly of Microgels by Metallo-Supramolecular Chemistry »
Julien Es Sayed, Christophe Meyer, Nicolas Sanson* and Patrick Perrin*
ACS Macro Lett. 2020


See also...

Durability of cement pastes exposed to external sulfate attack and leaching: Physical and chemical aspects

The unfortunate recent collapse of the Morandi bridge in Genoa has reminded us of the importance of the degradation of concrete and cement with (...) 

> More...

Le frottement des caoutchoucs dépend de leur déformation

Dans un article récemment paru dans Soft Matter, nous montrons que le frottement local d’élastomères silicones sur des surfaces lisses de verre est (...) 

> More...


Practical information

Sciences et Ingénierie de la Matière Molle

Soft Matter Enginering and Science Laboratory - UMR 7615

10 rue Vauquelin
75231 PARIS CEDEX 05

  • Chair : E. Barthel
  • Vice Chairs : J.B. d’Espinose & G. Ducouret
  • Administration : F. Decuq, M.-T. Mendy & M. Hirano-Courcot
  • Communication : A. Hakopian & M. Ciccotti
  • Information Technology : A. Hakopian
  • Safety, Health and Environment Assistant : F. Martin

Getting here