Ceria nanoparticle vesicles formed in sodium oleate aqueous solution with mesoporous silica coating

Haruyuki Ishii, Saki Ito, Daisuke Nagao, Mikio Konno

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Fabrications of nanoparticle-assembled hollow structures have intensively been studied because of their unique properties applicable to catalysts, plasmonic materials and drug delivery systems. The present work proposes a novel method for the synthesis of nanoparticle vesicles in the presence of sodium oleate (NaOA). Our method is composed of two processes, one of which is self-assembly formation in the suspension of ceria nanoparticles (CeNPs) and NaOA, and the other is the fixation of the self-assembled structures with silica coating. The method is a facile one-pot synthesis conducted in weak basic conditions with and without ammonia. N-trimethoxysilyl-propyl- N,N,N-trimethylammonium chloride (TMAPS) and tetramethoxysilane were successively added for the silica coating. The structure of the product was submicron-meter sized hollow assembly of the ceria nanoparticles with outer silica shell, silica-coated CeNP vesicle. The calcined sample had meso-pore structures in the silica shells. The present method may open the door for application to various kinds of metal oxides and inorganic nanoparticles for obtaining nanoparticle vesicles.

Original languageEnglish
Pages (from-to)638-642
Number of pages5
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Publication statusPublished - 2014 Jan 20


  • Ceria nanoparticle
  • Nanoparticle vesicle
  • Silica coating
  • Sodium oleate


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