Core-shell and asymmetric polystyrene-gold composite particles via one-step pickering emulsion polymerization

Mingmeng Zhang, Thao H. Ngo, Noelle I. Rabiah, Todd P. Otanicar, Patrick Phelan, Raja Swaminathan, Lenore Dai

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

Core-shell structured polystyrene-gold composite particles are synthesized from one-step Pickering emulsion polymerization. The surface coverage of the core-shell composite particles is improved with increasing gold nanoparticle (AuNP) hydrophobicity and concentration. At high surface coverage, the AuNPs exhibit an ordered hexagonal pattern, likely due to electrostatic repulsion during the emulsion polymerization process. In addition to core-shell structured polystyrene-gold composite particles, an intriguing observation is that at low AuNP concentrations, asymmetric polystyrene-gold nanocomposite particles are simultaneously formed, where a single gold nanoparticle is attached onto each polystyrene particle. It is found that these asymmetric particles are formed via a "seeded-growth" mechanism. The core-shell and asymmetric polystyrene-gold composite particles prove to be efficient catalysts as they successfully catalyze the Rhodamine B reduction reaction with stable performance and show high recyclability as catalysts.

Original languageEnglish (US)
Pages (from-to)75-82
Number of pages8
JournalLangmuir
Volume30
Issue number1
DOIs
StatePublished - Jan 14 2014

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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