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

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

53 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 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

All Science Journal Classification (ASJC) codes

Materials Chemistry
Surfaces, Coatings and Films
Physical and Theoretical 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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doi = "10.1021/jp0457702",

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TY - JOUR

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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EP - 18

JO - Journal of Physical Chemistry B

JF - Journal of Physical Chemistry B

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Controlling the size of magnetic nanoparticles using pluronic block copolymer surfactants

Abstract

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