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

doi:10.1021/jp0457702

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

Chemical and Biomolecular Engineering

Research output: Contribution to journal › Article › peer-review

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 language	English (US)
Pages (from-to)	15-18
Number of pages	4
Journal	Journal of Physical Chemistry B
Volume	109
Issue number	1
DOIs	https://doi.org/10.1021/jp0457702
State	Published - Jan 13 2005

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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10.1021/jp0457702

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title = "Controlling the size of magnetic nanoparticles using pluronic block copolymer surfactants",

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. M{\"o}ssbauer 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.",

author = "Lai, {Jr Iuan} and Shafi, {Kurikka V.P.M.} and Abraham Ulman and Katja Loos and Yongjae Lee and Thomas Vogt and Lee, {Wei Li} and Ong, {N. P.}",

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T1 - Controlling the size of magnetic nanoparticles using pluronic block copolymer surfactants

AU - Lai, Jr Iuan

AU - Shafi, Kurikka V.P.M.

AU - Ulman, Abraham

AU - Loos, Katja

AU - Lee, Yongjae

AU - Vogt, Thomas

AU - Lee, Wei Li

AU - Ong, N. P.

PY - 2005/1/13

Y1 - 2005/1/13

N2 - 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.

AB - 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.

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Controlling the size of magnetic nanoparticles using pluronic block copolymer surfactants

Abstract

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