Size-control synthesis of structure deficient truncated octahedral Fe 3-δ O 4 nanoparticles

High magnetization magnetites as effective hepatic contrast agents

Chih-Chia Huang, Kuei Yi Chuang, Chen Pin Chou, Ming Ting Wu, Hwo Shuenn Sheu, Dar-Bin Shieh, Chiau Yuang Tsai, Chia Hao Su, Huan Yao Lei, Chen-Sheng Yeh

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

This study reports the size-controlled synthesis of truncated octahedral Fe 3-δ O 4 nanoparticles varying from 5 to 22 nm in edge length. Size-dependent XRD spectra show that the iron oxide gradually shifted from magnetite toward maghemite as the size decreased. The nonstoichiometric Fe 3-δ O 4 was expressed the resulting iron oxide nanoparticles. The smaller particle size resulted in larger δ value. The size dependence of the XRD, magnetization, and Raman measurements indicate that the 22 nm-sized particles formed magnetite nanoparticles. The saturation magnetization increased linearly as the particle size increased, eventually reaching 94 emu/g, which is comparable to bulk magnetite (92 emu/g). The magnetic behavior of Fe 3-δ O 4 nanoparticles exhibited a transition from superparamagnetism to ferromagnetism when the particles reached 22 nm in size. The XRD, electron diffraction analysis, fast Fourier transform filtering analysis, and Ar ion beam etching results in this study indicate that the presence of metallic iron in the 22 nm-sized magnetite nanoparticles was responsible for their high magnetization. The high magnetization of the 22 nm-sized magnetite was achieved by different surface modification strategies using surfactant (CTAB) and a polymer (PSMA), generating hydrophilic properties. The chosen PSMA-coated magnetites have an r 2 relaxivity larger than 200 mM -1 s -1 , whereas the commercial Resovist hepatic agent achieves only 91 mM -1 s -1 . In an effort to develop highly effective hepatic contrast agents, the PSMA-coated magnetite was injected into BALB/C mice to evaluate the T 2 * relaxation and image contrast. Results show a greater signal reduction in the liver than Resovist agent. The biodistribution profile of these iron oxide nanoparticles shows significant liver uptake, which is consistent with MRI observations.

Original languageEnglish
Pages (from-to)7472-7479
Number of pages8
JournalJournal of Materials Chemistry
Volume21
Issue number20
DOIs
Publication statusPublished - 2011 May 28

Fingerprint

Ferrosoferric Oxide
Magnetite
Contrast Media
Magnetization
Nanoparticles
Magnetite Nanoparticles
Iron oxides
Magnetite nanoparticles
Liver
Particle size
Superparamagnetism
Ferromagnetism
Saturation magnetization
Surface-Active Agents
Electron diffraction
Fast Fourier transforms
Magnetic resonance imaging
Ion beams
Surface treatment
Etching

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

Cite this

Huang, Chih-Chia ; Chuang, Kuei Yi ; Chou, Chen Pin ; Wu, Ming Ting ; Sheu, Hwo Shuenn ; Shieh, Dar-Bin ; Tsai, Chiau Yuang ; Su, Chia Hao ; Lei, Huan Yao ; Yeh, Chen-Sheng. / Size-control synthesis of structure deficient truncated octahedral Fe 3-δ O 4 nanoparticles : High magnetization magnetites as effective hepatic contrast agents. In: Journal of Materials Chemistry. 2011 ; Vol. 21, No. 20. pp. 7472-7479.
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abstract = "This study reports the size-controlled synthesis of truncated octahedral Fe 3-δ O 4 nanoparticles varying from 5 to 22 nm in edge length. Size-dependent XRD spectra show that the iron oxide gradually shifted from magnetite toward maghemite as the size decreased. The nonstoichiometric Fe 3-δ O 4 was expressed the resulting iron oxide nanoparticles. The smaller particle size resulted in larger δ value. The size dependence of the XRD, magnetization, and Raman measurements indicate that the 22 nm-sized particles formed magnetite nanoparticles. The saturation magnetization increased linearly as the particle size increased, eventually reaching 94 emu/g, which is comparable to bulk magnetite (92 emu/g). The magnetic behavior of Fe 3-δ O 4 nanoparticles exhibited a transition from superparamagnetism to ferromagnetism when the particles reached 22 nm in size. The XRD, electron diffraction analysis, fast Fourier transform filtering analysis, and Ar ion beam etching results in this study indicate that the presence of metallic iron in the 22 nm-sized magnetite nanoparticles was responsible for their high magnetization. The high magnetization of the 22 nm-sized magnetite was achieved by different surface modification strategies using surfactant (CTAB) and a polymer (PSMA), generating hydrophilic properties. The chosen PSMA-coated magnetites have an r 2 relaxivity larger than 200 mM -1 s -1 , whereas the commercial Resovist hepatic agent achieves only 91 mM -1 s -1 . In an effort to develop highly effective hepatic contrast agents, the PSMA-coated magnetite was injected into BALB/C mice to evaluate the T 2 * relaxation and image contrast. Results show a greater signal reduction in the liver than Resovist agent. The biodistribution profile of these iron oxide nanoparticles shows significant liver uptake, which is consistent with MRI observations.",
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Size-control synthesis of structure deficient truncated octahedral Fe 3-δ O 4 nanoparticles : High magnetization magnetites as effective hepatic contrast agents. / Huang, Chih-Chia; Chuang, Kuei Yi; Chou, Chen Pin; Wu, Ming Ting; Sheu, Hwo Shuenn; Shieh, Dar-Bin; Tsai, Chiau Yuang; Su, Chia Hao; Lei, Huan Yao; Yeh, Chen-Sheng.

In: Journal of Materials Chemistry, Vol. 21, No. 20, 28.05.2011, p. 7472-7479.

Research output: Contribution to journalArticle

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T2 - High magnetization magnetites as effective hepatic contrast agents

AU - Huang, Chih-Chia

AU - Chuang, Kuei Yi

AU - Chou, Chen Pin

AU - Wu, Ming Ting

AU - Sheu, Hwo Shuenn

AU - Shieh, Dar-Bin

AU - Tsai, Chiau Yuang

AU - Su, Chia Hao

AU - Lei, Huan Yao

AU - Yeh, Chen-Sheng

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