A novel synthesis of core/shell Co0.5Ni0.5Fe2O4/SiO2 nanomaterial and the effect of SiO2 on its magnetic properties

Co0.5Ni0.5Fe2O4 nanoparticles have been synthesized by a stearic acid method. Core/shell Co0.5Ni0.5Fe2O4/SiO2 nanomaterials at varying amount of SiO2 are prepared by hydrolysis and condensation of tetraethyl orthosilicate (TEOS) precursor. The composition phase and average crystallite size have been...

Full description

Saved in:
Bibliographic Details
Published in:Indian journal of chemical technology 2019-03, Vol.26 (2), p.175
Main Authors: Ha, Huynh Ky Phuong, Gaspillo, Pag-asa, Oanh, Pham Le Kieu, Vien, Le Minh, Van, Nguyen Thi Thuy, Tri, Nguyen
Format: Article
Language:English
Subjects:
Coercivity
Core-shell particles
Crystallites
Crystals
Domain walls
Fourier transforms
Magnetic properties
Magnetic saturation
Morphology
Nanomaterials
Nanoparticles
Nanotechnology
Silicon dioxide
Stearic acid
Tetraethyl orthosilicate
Transmission electron microscopy
X-ray diffraction
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Co0.5Ni0.5Fe2O4 nanoparticles have been synthesized by a stearic acid method. Core/shell Co0.5Ni0.5Fe2O4/SiO2 nanomaterials at varying amount of SiO2 are prepared by hydrolysis and condensation of tetraethyl orthosilicate (TEOS) precursor. The composition phase and average crystallite size have been characterized by means of X-ray diffraction. The particle structure and morphology of the core-shell nanoparticles are determined using transmission electron microscopy (TEM). The presence of Si-O-Si bonds for both coated samples is confirmed through Fourier transform infrared spectroscopic. Results show a decreasing saturation magnetization (Ms) when amount of TEOS is increased. The addition of SiO2 at first instance enhance the coercivity (Hc), and maximum Hc is observed when 0.4 mL TEOS is added. However, adding more SiO2 decrease the coercivity because the domain wall motion on the surface of nanoparticles is limited.
ISSN:0971-457X
0975-0991