Publication:
Vacancy ordered γ-Fe 2 O 3 nanoparticles functionalized with nanohydroxyapatite: XRD, FTIR, TEM, XPS and Mössbauer studies
Vacancy ordered γ-Fe 2 O 3 nanoparticles functionalized with nanohydroxyapatite: XRD, FTIR, TEM, XPS and Mössbauer studies
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Date
2016
Authors
Ramos Guivar J.A.
Sanches E.A.
Bruns F.
Sadrollahi E.
Morales M.A.
López E.O.
Litterst F.J.
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
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Abstract
Vacancy ordered maghemite (γ-Fe2O3) nanoparticles functionalized with nanohydroxyapatite (HAp – Ca10(PO4) 6(OH)2) have been successfully synthesized using an inexpensive co-precipitation chemical route. Evidence for the presence of vacancy order in maghemite was shown by the superstructure lines observed in X-ray diffraction. The adsorption of carboxyl groups of citric acid (C6H8O7) onto γ-Fe2O3 nanoparticles was investigated by FTIR, XPS and Mössbauer spectroscopy. From XPS surface analysis, two binding energies related to oxygen were attributed to bindings between C6H8O7/γ- Fe2O3 and C6H8O7/HAp from an interfacial reaction promoted by strongly adsorbed H2O molecules at the surface of these nanomaterials.
Description
Keywords
X ray photoelectron spectroscopy,
Binding energy,
Hematite,
Nanoparticles,
Saturation magnetization,
Surface analysis,
Synthesis (chemical),
Temperature distribution,
X ray diffraction