Magnetic and porous nanospheres from ultrasonic spray pyrolysis

Won Hyuk Suh, Kenneth S. Suslick

Research output: Contribution to journalArticle

Abstract

We have used an inexpensive high-frequency ultrasound generator from a household humidifier to create a useful source for ultrasonic spray pyrolysis and produced submicrometer silica particles that are porous on the nanometer scale. By using two heated zones, we first initiate polymerization of organic monomers in the presence of silica colloid, which creates in situ a composite of silica with an organic polymer, followed by a second heating to pyrolyze and remove the polymer. The morphology and surface area of the final porous silica are controlled by varying the silica-to-organic monomer ratio. In a single flow process, ferromagnetic cobalt nanoparticles can be easily encapsulated in the porous silica, and the resulting nanospheres are extremely resistant to air oxidation. Products were characterized by SEM, (S)TEM, EDS, XPS, and SQUID.

Original languageEnglish (US)
Pages (from-to)12007-12010
Number of pages4
JournalJournal of the American Chemical Society
Volume127
Issue number34
DOIs
StatePublished - Aug 31 2005

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ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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