Electrolyte-added one-pot synthesis for producing monodisperse, micrometer-sized silica particles up to 7 μm

Hiroyuki Nakabayashi, Akira Yamada, Masahiro Noba, Yoshio Kobayashi, Mikio Konno, Daisuke Nagao

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


A facile one-pot synthesis to produce micrometer-sized silica particles with low polydispersity was examined in a semibatch process where an ethanol solution of tetraethyl orthosilicate (TEOS) was continuously supplied to another ethanol solution of water and ammonia containing an electrolyte of LiCl, NaCl, or KCl. Supply rates of the TEOS solution was ranged with the water and electrolyte concentrations, which indicated that the addition of KCl at a low water concentration was effective to increase size of silica particles in a micrometer range. Highly monodisperse silica particles with an average size of 6.6 μm were successfully produced at 3 mol/m3 KCl and 5 kmol/m3 water. The efficiency of KCl addition for producing the large particles is interpreted by the previously proposed nucleation and growth mechanism that expects rapid particle coagulation in early reaction stage for particles which have reduced surface potential by the adsorption of cations with a large ionic radius. It is confirmed from competitive growth reactions that the silica particle growth follows the reaction-limited mechanism even in the semibatch process.

Original languageEnglish
Pages (from-to)7512-7515
Number of pages4
Issue number10
Publication statusPublished - 2010 May 18

ASJC Scopus subject areas

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


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