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

doi:10.1016/j.materresbull.2019.04.039

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

School of Advanced Science and Engineering

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

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 language	English
Journal	Materials Research Bulletin
DOIs	https://doi.org/10.1016/j.materresbull.2019.04.039
Publication status	Published - 2019 Jan 1

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

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Kamura, A., Ozaki, M., Idota, N., & Sugahara, Y. (2019). 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 Materials Research Bulletin. https://doi.org/10.1016/j.materresbull.2019.04.039

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 . / Kamura, Atsuo; Ozaki, Masahiko; Idota, Naokazu; Sugahara, Yoshiyuki.

In: Materials Research Bulletin, 01.01.2019.

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

Kamura, A, Ozaki, M, Idota, N & Sugahara, Y 2019, ' 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 ', Materials Research Bulletin. https://doi.org/10.1016/j.materresbull.2019.04.039

Kamura A, Ozaki M, Idota N, Sugahara Y. 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 Materials Research Bulletin. 2019 Jan 1. https://doi.org/10.1016/j.materresbull.2019.04.039

Kamura, Atsuo ; Ozaki, Masahiko ; Idota, Naokazu ; Sugahara, Yoshiyuki. / 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 In: Materials Research Bulletin. 2019.

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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",

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AU - Ozaki, Masahiko

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AU - Sugahara, Yoshiyuki

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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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KW - A. Nanostructures

KW - B. Chemical synthesis

KW - B. Magnetic properties

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