Thermoreversible Surface Polymer Patches: A CryogenicTransmission Electron Microscopy Investigation

Christian Rossner, Ilse Letofsky-Papst, Andreas Fery, Albena Lederer, Gerald Kothleitner

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Hybrid core−shell type nanoparticles fromgold nanoparticle cores and poly(N-isopropylacrylamide)shells were investigated with regard to their structuralplasticity. Reversible addition−fragmentation chain transferpolymerization was used to synthesize well-defined polymersthat can be readily anchored onto the gold nanoparticlesurface. The polymer shell morphologies were directlyvisualized in their native solution state at high resolution bycryogenic transmission electron microscopy, and the microscopicresults were further corroborated by dynamic lightscattering. Different environmental conditions and brusharchitectures are covered by our experiments, which leads todistinct thermally induced responses. These responses includeconstrained dewetting of the nanoparticle surface at temperatures above the lower critical solution temperature of poly(Nisopropylacrylamide),leading to surface polymer patches. This effect provides a novel approach toward breaking the symmetryof nanoparticle interactions, and we show first evidence for its impact on the formation of colloidal superstructures.
Original languageEnglish
Pages (from-to)8622-8628
JournalLangmuir
Volume34
DOIs
Publication statusPublished - 2018

ASJC Scopus subject areas

  • Materials Science(all)

Fields of Expertise

  • Advanced Materials Science

Treatment code (Nähere Zuordnung)

  • Basic - Fundamental (Grundlagenforschung)

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