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, ISSN: 0025-5408, Vol: 118, Page: 110475
2019
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Article Description
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 (DDPA 1/32 ) and 16 nm (DDPA 1/64 ). 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.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0025540818326631; http://dx.doi.org/10.1016/j.materresbull.2019.04.039; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85065914705&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0025540818326631; https://dx.doi.org/10.1016/j.materresbull.2019.04.039
Elsevier BV
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