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

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

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Poloxamer
block copolymers
Surface-Active Agents
Block copolymers
Surface active agents
surfactants
Nanoparticles
nanoparticles
Superparamagnetism
Ferromagnetism
Synchrotrons
Oxides
Magnetization
Transmission electron microscopy
ferromagnetism
synchrotrons
adjusting
magnetization
transmission electron microscopy
oxides

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Controlling the size of magnetic nanoparticles using pluronic block copolymer surfactants. / Lai, Jr Iuan; Shafi, Kurikka V P M; Ulman, Abraham; Loos, Katja; Lee, Yongjae; Vogt, Thomas; Lee, Wei Li; Ong, N. P.

In: Journal of Physical Chemistry B, Vol. 109, No. 1, 13.01.2005, p. 15-18.

Research output: Contribution to journalArticle

Lai, Jr Iuan ; Shafi, Kurikka V P M ; Ulman, Abraham ; Loos, Katja ; Lee, Yongjae ; Vogt, Thomas ; Lee, Wei Li ; Ong, N. P. / Controlling the size of magnetic nanoparticles using pluronic block copolymer surfactants. In: Journal of Physical Chemistry B. 2005 ; Vol. 109, No. 1. pp. 15-18.
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AU - Vogt, Thomas

AU - Lee, Wei Li

AU - Ong, N. P.

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