TY - JOUR
T1 - 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
AU - Kamura, Atsuo
AU - Ozaki, Masahiko
AU - Idota, Naokazu
AU - Sugahara, Yoshiyuki
N1 - Funding Information:
This research was financially supported in part by a Grant-in Aid for Scientific Research on Innovative Areas “New Polymeric Materials Based on Element-Blocks (No. 2401)” (JSPS KAKENHI Grant Numbers JP24102002). This manuscript is a part of the outcome of research performed under a Waseda University Grant for Special Research Project (Project number: 2017B-194).
Funding Information:
This research was financially supported in part by a Grant-in Aid for Scientific Research on Innovative Areas “New Polymeric Materials Based on Element-Blocks (No. 2401)” (JSPS KAKENHI Grant Numbers JP24102002 ). This manuscript is a part of the outcome of research performed under a Waseda University Grant for Special Research Project (Project number: 2017B-194).
Publisher Copyright:
© 2019
PY - 2019/10
Y1 - 2019/10
N2 - 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.
AB - 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.
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
SN - 0025-5408
VL - 118
JO - Materials Research Bulletin
JF - Materials Research Bulletin
M1 - 110475
ER -