Environment-sensitive stabilisation of silver nanoparticles in aqueous solutions

I.K. Voets, A. de Keizer, P.M. Frederik, R. Jellema, M.A.C. Stuart

Research output: Contribution to journalArticleAcademicpeer-review

8 Citations (Scopus)

Abstract

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), P2MVP(38)-b-PEO211, and poly(acrylic acid)-block-poly(isopropyl acrylamide), PAA(55)-b-PNIPAAm(88) in the presence of AgNO3. Hence, the P2MVP and PAA segments were employed to fix Ag+ ions within the micellar core (25 degrees C) or shell (60 degrees C), while the PEO segments ensured spontaneous reduction of Ag+ ions into metallic Ag, as well as colloidal stabilisation. Spherical and elongated composite core-shell(-corona) nanoparticles (CNPs) were formed containing several small, spherical silver nanoparticles within the micellar core or shell. As the co-assembly of the oppositely charged copolymers into micelles is electrostatically driven, the CNPs can be destabilised by, for example, addition of simple salts, i.e., the CNPs are stimuli responsive. CNP size and morphology control can be achieved via the preparation protocol. For example, heating to 60 degrees C, i.e., above the PNI-PAAm LCST, results in core-shell-corona CNPs with the Ag-NPs situated in the aggregate shell
Original languageEnglish
Pages (from-to)317-324
JournalJournal of Colloid and Interface Science
Volume339
Issue number2
DOIs
Publication statusPublished - 2009

Keywords

  • amphiphilic block-copolymers
  • quantum dots
  • contrast agents
  • core micelles
  • micellization
  • oxide
  • polymerization
  • complexes
  • colloids
  • growth

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