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Title: A novel solvethermal method for the preparation of magnetic monodisperse Fe{sub 3}O{sub 4} nanoparticles II: High-surface-activity ferrihydrite used as precursor

Graphical abstract: The magnetic monodisperse Fe{sub 3}O{sub 4} nanoparticles (NPs) were prepared by novel solvethemal method at moderate temperature using high surface active ferrihydrit and iron powder as precursors in orgnic solvent. - Highlights: • Facile synthesis of organic ligands-coated monodisperse Fe{sub 3}O{sub 4} nanoparticles at low temperature. • Low-cost high surface active ferrihydrit and reductive iron powder were used as precursors. • N{sub 2}-free reaction environment. • Organic ligands act as reductive. - Abstract: Magnetic monodisperse Fe{sub 3}O{sub 4} nanoparticles (NPs) were prepared from ferrihydrite and iron powder by a novel solvethermal method at moderate temperatures in aqueous and organic solvent media. The effects of temperature and solvent medium on the phase and particle size of Fe{sub 3}O{sub 4} NPs were investigated. The products were characterized by X-ray powder diffraction, infrared spectroscopy, differential scanning calorimetry–thermogravimetric analysis, transmission electron microscopy, and vibrating sample magnetometry. At 120 °C in the organic medium, uniform organic-ligand-coated superparamagnetic Fe{sub 3}O{sub 4} NPs were produced; the particle size increased with the temperature, and the calculated mean particle size was 8.9 nm. At 180 °C in the aqueous medium, pure-phase Fe{sub 3}O{sub 4} was obtained. Thus, the organic solvent did not only serve as a solventmore » but also participated in the reaction. Fe{sub 3}O{sub 4} production in the aqueous and organic solvent media had different mechanisms.« less
Authors:
;  [1] ;  [2] ;  [1]
  1. School of Pharmaceutical Sciences, Hebei Medical University, Shijiazhuang 050017 (China)
  2. School of Chemistry and Materials Sciences, Nanjing Normal University, Nanjing (China)
Publication Date:
OSTI Identifier:
22285172
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 48; Journal Issue: 10; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTROSCOPY; FERRITES; INFRARED SPECTRA; IRON; IRON OXIDES; LIGANDS; MAGNETIC PROPERTIES; NANOSTRUCTURES; ORGANIC SOLVENTS; PARTICLE SIZE; PARTICLES; POWDERS; SUPERPARAMAGNETISM; SYNTHESIS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION