Open AccessPreparation and characterization of superparamagnetic α-Fe2O3/Fe3O4@SiO2 nanocomposites via a citric-TEOS-ethanol solution combustion process
Author(s) -
Min Liu,
Lulu Yu,
Yanling Zhang,
Shaoshuai Zhang,
Yanxin Yang,
Ruijiang Liu
Publication year - 2021
Publication title -
materials research express
Language(s) - English
Resource type - Journals
ISSN - 2053-1591
DOI - 10.1088/2053-1591/abd908
Subject(s) - calcination , tetraethyl orthosilicate , materials science , nanocomposite , superparamagnetism , citric acid , anhydrous , crystallinity , nuclear chemistry , chemical engineering , inorganic chemistry , chemistry , nanotechnology , magnetization , catalysis , organic chemistry , composite material , quantum mechanics , magnetic field , engineering , physics
Superparamagnetic α -Fe 2 O 3 /Fe 3 O 4 @SiO 2 nanocomposites were prepared by the citric-TEOS-ethanol solution combustion method. Four key influencing factors, i.e. the calcination temperature, the volume of anhydrous ethanol, the volume of tetraethyl orthosilicate (TEOS), and the molar ratio of iron nitrate and citric acid (IN:CA) were investigated. The calcination temperature and the volume of anhydrous ethanol mainly affected the phase composition of α -Fe 2 O 3 /Fe 3 O 4 @SiO 2 nanocomposite, and the volume of TEOS and the ratio of IN:CA had a great influence on the crystallinity of α -Fe 2 O 3 /Fe 3 O 4 @SiO 2 nanocomposites. The tendency for the properties of superparamagnetic α -Fe 2 O 3 /Fe 3 O 4 @SiO 2 nanocomposites changing with the conditions was explored and the mechanism was analyzed.