Preparation of Fe 3 O 4 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

Research output: Contribution to journalArticle

Abstract

Magnetite (Fe 3 O 4 ) 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 Fe 3 O 4 NPs when the amount of DDPA was small (DDPA/Fe < 1/16). Thermogravimetry and infrared spectroscopy demonstrated surface modification of Fe 3 O 4 NPs with DDPA. TEM observation showed the size range of Fe 3 O 4 NPs to be 2–10 nm. Dynamic light scattering analysis showed narrow particle size distribution of Fe 3 O 4 NPs in toluene, moreover, with median diameters of 9.1 (DDPA1/32) and 16 nm (DDPA1/64). Magnetic characterization of Fe 3 O 4 NPs modified with DDPA showed lower saturation magnetization as compared with unmodified Fe 3 O 4 NPs, and indicated superparamagnetic Fe 3 O 4 NPs formation.

Original languageEnglish
JournalMaterials Research Bulletin
DOIs
Publication statusPublished - 2019 Jan 1

Fingerprint

Pyridine
Anions
pyridines
Negative ions
Nanoparticles
anions
Oxidation
nanoparticles
preparation
oxidation
acids
Acids
Oxides
oxides
Ferrosoferric Oxide
pyridine N-oxide
Reducing Agents
Toluene
Magnetite
Dynamic light scattering

Keywords

  • A. Magnetic materials
  • A. Nanostructures
  • B. Chemical synthesis
  • B. Magnetic properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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title = "Preparation of Fe 3 O 4 nanoparticles modified with n-dodecylphosphonic acid via a one-pot nonaqueous process using an oxidation reaction of tetrachloroferrate (III) anions by pyridine-N-oxide",
abstract = "Magnetite (Fe 3 O 4 ) 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 Fe 3 O 4 NPs when the amount of DDPA was small (DDPA/Fe < 1/16). Thermogravimetry and infrared spectroscopy demonstrated surface modification of Fe 3 O 4 NPs with DDPA. TEM observation showed the size range of Fe 3 O 4 NPs to be 2–10 nm. Dynamic light scattering analysis showed narrow particle size distribution of Fe 3 O 4 NPs in toluene, moreover, with median diameters of 9.1 (DDPA1/32) and 16 nm (DDPA1/64). Magnetic characterization of Fe 3 O 4 NPs modified with DDPA showed lower saturation magnetization as compared with unmodified Fe 3 O 4 NPs, and indicated superparamagnetic Fe 3 O 4 NPs formation.",
keywords = "A. Magnetic materials, A. Nanostructures, B. Chemical synthesis, B. Magnetic properties",
author = "Atsuo Kamura and Masahiko Ozaki and Naokazu Idota and Yoshiyuki Sugahara",
year = "2019",
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doi = "10.1016/j.materresbull.2019.04.039",
language = "English",
journal = "Materials Research Bulletin",
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TY - JOUR

T1 - Preparation of Fe 3 O 4 nanoparticles modified with n-dodecylphosphonic acid via a one-pot nonaqueous process using an oxidation reaction of tetrachloroferrate (III) anions by pyridine-N-oxide

AU - Kamura, Atsuo

AU - Ozaki, Masahiko

AU - Idota, Naokazu

AU - Sugahara, Yoshiyuki

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Magnetite (Fe 3 O 4 ) 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 Fe 3 O 4 NPs when the amount of DDPA was small (DDPA/Fe < 1/16). Thermogravimetry and infrared spectroscopy demonstrated surface modification of Fe 3 O 4 NPs with DDPA. TEM observation showed the size range of Fe 3 O 4 NPs to be 2–10 nm. Dynamic light scattering analysis showed narrow particle size distribution of Fe 3 O 4 NPs in toluene, moreover, with median diameters of 9.1 (DDPA1/32) and 16 nm (DDPA1/64). Magnetic characterization of Fe 3 O 4 NPs modified with DDPA showed lower saturation magnetization as compared with unmodified Fe 3 O 4 NPs, and indicated superparamagnetic Fe 3 O 4 NPs formation.

AB - Magnetite (Fe 3 O 4 ) 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 Fe 3 O 4 NPs when the amount of DDPA was small (DDPA/Fe < 1/16). Thermogravimetry and infrared spectroscopy demonstrated surface modification of Fe 3 O 4 NPs with DDPA. TEM observation showed the size range of Fe 3 O 4 NPs to be 2–10 nm. Dynamic light scattering analysis showed narrow particle size distribution of Fe 3 O 4 NPs in toluene, moreover, with median diameters of 9.1 (DDPA1/32) and 16 nm (DDPA1/64). Magnetic characterization of Fe 3 O 4 NPs modified with DDPA showed lower saturation magnetization as compared with unmodified Fe 3 O 4 NPs, and indicated superparamagnetic Fe 3 O 4 NPs formation.

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