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 | |
| Publication status | Published - 2019 Jan 1 |
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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
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
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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.
KW - A. Magnetic materials
KW - A. Nanostructures
KW - B. Chemical synthesis
KW - B. Magnetic properties
UR - http://www.scopus.com/inward/record.url?scp=85065914705&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85065914705&partnerID=8YFLogxK
U2 - 10.1016/j.materresbull.2019.04.039
DO - 10.1016/j.materresbull.2019.04.039
M3 - Article
AN - SCOPUS:85065914705
JO - Materials Research Bulletin
JF - Materials Research Bulletin
SN - 0025-5408
ER -