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Mesoporous α‐Fe 2 O 3 Nanospheres: Structural Evolution and Investigation of Magnetic Properties
Author(s) -
Li Guang,
Liu Mingyang,
Kou HuiZhong
Publication year - 2011
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201003068
Subject(s) - calcination , mesoporous material , materials science , chemical engineering , polyethylene glycol , nanotechnology , chemistry , organic chemistry , catalysis , engineering
A solvothermal route is adopted to produce mesoporous α‐Fe 2 O 3 nanospheres by using polyethylene glycol as soft template and n ‐butanol/H 2 O as mixed solvent. The mesoporous α‐Fe 2 O 3 nanospheres are subjected to calcination at different temperatures, and the specific surface area, pore size, and magnetic properties of the as‐prepared nanospheres are investigated. The studies reveal that the pore sizes of the mesoporous α‐Fe 2 O 3 nanospheres increase with higher calcination temperature, and high‐temperature calcination brings about tightness of the pore wall. Magnetic studies show that aggregation of the small particles raises the Morin transition temperature.