Physical gels based on charge-driven bridging of nanoparticles by triblock copolymers

M. Lemmers, E. Spruijt, S. Akerboom, I.K. Voets, A.C. van Aelst, M.A. Cohen Stuart, J. van der Gucht

Research output: Contribution to journalArticleAcademicpeer-review

15 Citations (Scopus)

Abstract

We have prepared an aqueous physical gel consisting of negatively charged silica nanoparticles bridged by ABA triblock copolymers, in which the A blocks are positively charged and the B block is neutral and water-soluble. Irreversible aggregation of the silica nanoparticles was prevented by precoating them with a neutral hydrophilic polymer. Both the elastic plateau modulus and the relaxation time increase slowly as the gel ages, indicating an increase both in the number of active bridges and in the strength with which the end blocks are adsorbed. The rate of this aging process can be increased significantly by applying a small shear stress to the sample. Our results indicate that charge-driven bridging of nanoparticles by triblock copolymers is a promising strategy for thickening of aqueous particle containing materials, such as water-based coatings.
Original languageEnglish
Pages (from-to)12311-12318
JournalLangmuir
Volume28
Issue number33
DOIs
Publication statusPublished - 2012

Keywords

  • dynamic light-scattering
  • shear-induced gelation
  • nanocomposite hydrogels
  • formulation process
  • colloidal silica
  • aqueous-solution
  • reversible gels
  • micelles
  • macromolecules
  • adsorption

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