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

Abstract

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.

Authors:
;  [1]
  1. Department of Food Science, Fu Jen University, Taipei 242, Taiwan (China)
Publication Date:
OSTI Identifier:
22202849
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 45; Journal 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); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Kumar, Ramesh, Inbaraj, B. Stephen, Chen, B.H., E-mail: 002622@mail.fju.edu.tw, and Graduate Institute of Medicine, Fu Jen University, Taipei 242, Taiwan. Surface modification of superparamagnetic iron nanoparticles with calcium salt of poly({gamma}-glutamic acid) as coating material. United States: N. p., 2010. Web. doi:10.1016/J.MATERRESBULL.2010.07.017.
Kumar, Ramesh, Inbaraj, B. Stephen, Chen, B.H., E-mail: 002622@mail.fju.edu.tw, & Graduate Institute of Medicine, Fu Jen University, Taipei 242, Taiwan. Surface modification of superparamagnetic iron nanoparticles with calcium salt of poly({gamma}-glutamic acid) as coating material. United States. https://doi.org/10.1016/J.MATERRESBULL.2010.07.017
Kumar, Ramesh, Inbaraj, B. Stephen, Chen, B.H., E-mail: 002622@mail.fju.edu.tw, and Graduate Institute of Medicine, Fu Jen University, Taipei 242, Taiwan. 2010. "Surface modification of superparamagnetic iron nanoparticles with calcium salt of poly({gamma}-glutamic acid) as coating material". United States. https://doi.org/10.1016/J.MATERRESBULL.2010.07.017.
@article{osti_22202849,
title = {Surface modification of superparamagnetic iron nanoparticles with calcium salt of poly({gamma}-glutamic acid) as coating material},
author = {Kumar, Ramesh and Inbaraj, B. Stephen and Chen, B.H., E-mail: 002622@mail.fju.edu.tw and Graduate Institute of Medicine, Fu Jen University, Taipei 242, Taiwan},
abstractNote = {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.},
doi = {10.1016/J.MATERRESBULL.2010.07.017},
url = {https://www.osti.gov/biblio/22202849}, journal = {Materials Research Bulletin},
issn = {0025-5408},
number = 11,
volume = 45,
place = {United States},
year = {Mon Nov 15 00:00:00 EST 2010},
month = {Mon Nov 15 00:00:00 EST 2010}
}