Controlling the size of magnetic nanoparticles using pluronic block copolymer surfactants

Jr Iuan Lai, Kurikka V.P.M. Shafi, Abraham Ulman, Katja Loos, Yongjae Lee, Thomas Vogt, Wei Li Lee, N. P. Ong

Research output: Contribution to journalArticle

44 Scopus citations

Abstract

We have successfully controlled the size of magnetic nanoparticles by adjusting the surfactant/solvent ratio. γ-Fe 2O 3 nanoparticles of 5.6 and 12.7, and Fe 0 nanoparticles of 22.3 nm in diameter were prepared, all having spherical shape and uniform size as confirmed by TEM. Mössbauer spectra confirmed Fe 3+ for the 5.6 and 12.7 nm particles and Fe 3+ and Fe 0 for 22.3 nm particles, in good agreement with synchrotron XRD patterns. Both room temperature and 5 K H-M measurements show that 22.3 nm particles have much higher magnetization than their oxide counterparts, in agreement with their being Fe 0. T-M measurements show superparamagnetism for 5.6 and 12.7 nm particles and ferromagnetism for 22.3 nm particles.

Original languageEnglish (US)
Pages (from-to)15-18
Number of pages4
JournalJournal of Physical Chemistry B
Volume109
Issue number1
DOIs
StatePublished - Jan 13 2005

All Science Journal Classification (ASJC) codes

  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Physical and Theoretical Chemistry

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