Surface modification of superparamagnetic iron nanoparticles with calcium salt of poly({gamma}-glutamic acid) as coating material

Journal Article · Mon Nov 15 00:00:00 EST 2010 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2010.07.017· OSTI ID:22202849

Kumar, Ramesh; Inbaraj, B. Stephen ^[1]

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1. Department of Food Science, Fu Jen University, Taipei 242, Taiwan (China)

Surface-modified magnetite nanoparticles (MNPs) were synthesized by co-precipitation of aqueous solution of ferrous and ferric salts (molar ratio 1:2) upon adding a base followed by calcium salt of poly({gamma}-glutamic acid) (Ca-{gamma}-PGA) for uniform coating on the surface of MNPs. Both uncoated and Ca-{gamma}-PGA-coated MNPs were characterized using various techniques including Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and vibrating sample magnetometric (VSM) studies. Compared with bare MNPs, the IR spectra of coated MNPs showed characteristic peaks of {gamma}-PGA, implying the {gamma}-PGA coating on MNPs did occur. The TEM images depicted an average size of 8-10 nm for bare MNPs and 14 nm for coated MNPs, with their shape being spherical in nature. In the presence of applied magnetic field, a superparamagnetic behavior was observed at room temperature for both bare and Ca-{gamma}-PGA-coated MNPs, with no magnetism left upon magnetic-field removal.

• OSTI ID: 22202849
• Journal Information: Materials Research Bulletin, Vol. 45, Issue 11; Other Information: Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
AQUEOUS SOLUTIONS
FOURIER TRANSFORM SPECTROMETERS
FOURIER TRANSFORMATION
GLUTAMIC ACID
INFRARED SPECTRA
MAGNETIC FIELDS
MAGNETIC PROPERTIES
MAGNETITE
MANGANESE PHOSPHIDES
NANOSTRUCTURES
PARTICLES
SUPERPARAMAGNETISM
THERMAL GRAVIMETRIC ANALYSIS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION