Preparation of silica-polystyrene core-shell particles up to micron sizes

Shunchao Gu, Tomohiro Kondo, Mikio Konno

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)


A method for producing silica-core composite particles with a polystyrene shell is proposed. Silica particles were prepared by the Stöber method through condensation and hydrolysis of tetraethyl orthosilicate in a water-ethanol-ammonia solution. The silica particles were the surface-modified with a coupling reagent, methacryloxypropyltrimethoxysilane (MPTMS), to introduce vinyl groups onto the particle surfaces. Polymerization of styrene was conducted with an initiator, potassium persulfate (KPS), and an anionic monomer, sodium p-styrenesulfonate (NaSS), in the presence of the silica particles. In these coating experiments, the average size of the silica particles was varied from 339 to 1210 nm with the concentration ranges of MPTMS (0-10 mmol/l), NaSS (0-10 mmol/l), KPS (4-12 mmol/l), and styrene (0.12-0.4 mol/l). Selection of reaction conditions enabled the preparation of composite particles that contained one core of silica. The coefficient of variance of size distribution of the composite particles was less than 7%, and shell thickness was in the range 125 to 410 nm.

Original languageEnglish
Pages (from-to)314-320
Number of pages7
JournalJournal of Colloid And Interface Science
Issue number2
Publication statusPublished - 2004 Apr 15


  • Anionic monomer
  • Composite particle
  • Coupling reagent
  • Polymerization reaction
  • Silica core

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry


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