Preparation of Fe3O4 nanoparticles modified with n-dodecylphosphonic acid via a one-pot nonaqueous process using an oxidation reaction of tetrachloroferrate (III) anions by pyridine-N-oxide

Atsuo Kamura, Masahiko Ozaki, Naokazu Idota, Yoshiyuki Sugahara*

*この研究の対応する著者

研究成果: Article査読

1 被引用数 (Scopus)

抄録

Magnetite (Fe3O4) nanoparticles (NPs) modified with n-dodecylphosphonic acid (DDPA) were prepared by one-pot nonaqueous synthesis using a salt comprising tetrachloroferrate (III) anions and methyltrioctylammonium cations as an Fe source, n-octylamine as a reductant, pyridine-N-oxide as an oxygen donor and DDPA as a phosphorus coupling reagent. The X-ray diffraction patterns, X-ray photoelectron spectroscopy and high-resolution transmission electron microscope (HRTEM) observation showed the formation of Fe3O4 NPs when the amount of DDPA was small (DDPA/Fe < 1/16). Thermogravimetry and infrared spectroscopy demonstrated surface modification of Fe3O4 NPs with DDPA. TEM observation showed the size range of Fe3O4 NPs to be 2–10 nm. Dynamic light scattering analysis showed narrow particle size distribution of Fe3O4 NPs in toluene, moreover, with median diameters of 9.1 (DDPA1/32) and 16 nm (DDPA1/64). Magnetic characterization of Fe3O4 NPs modified with DDPA showed lower saturation magnetization as compared with unmodified Fe3O4 NPs, and indicated superparamagnetic Fe3O4 NPs formation.

本文言語English
論文番号110475
ジャーナルMaterials Research Bulletin
118
DOI
出版ステータスPublished - 2019 10月

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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