Open AccessMagnetic Properties of Magnetite Nanoparticles (Fe3O4-NPs) Coated with Mesoporous Silica by Surfactant Templated Sol-Gel Method
Author(s) -
Nurul Izza Taib,
T.G. St Pierre,
Robert C. Woodward,
Michael J. House
Publication year - 2019
Publication title -
international journal of engineering and technology
Language(s) - English
Resource type - Journals
ISSN - 2227-524X
DOI - 10.14419/ijet.v7i4.14.27785
Subject(s) - materials science , superparamagnetism , fourier transform infrared spectroscopy , magnetite , squid , chemical engineering , mesoporous silica , nanoparticle , magnetic nanoparticles , transmission electron microscopy , mesoporous material , pulmonary surfactant , nanotechnology , magnetization , chemistry , organic chemistry , magnetic field , ecology , physics , quantum mechanics , engineering , metallurgy , biology , catalysis
Here, we present the magnetic properties of silica-coated magnetite nanoparticles. We have coated 7 nm of Fe3O4 with cetyltrimethylammonium bromide (CTAB) for phase transformation from hydrophobic to hydrophilic. Core-shell structure of silica-coated magnetite nanoparticles have been obtained using surfactant templated sol-gel method. The obtained silica-coated magnetite nanoparticles were characterized by transmission electron microscopy (TEM), fourier transform infrared (FTIR) spectroscopy and superconducting quantum interference device (SQuID). The hysteresis loops of the coated particles were measured using SQuID and the results showed a superparamagnetic behavior at room temperature. The saturation magnetization (Ms) of the coated particles indicate the presence of non-magnetic surface layers resulting from the strong chemical attachment of the silica to the Fe3O4’s surface, also observed by FTIR spectroscopy.