Morphology control of gamma-Fe2O3 nanocrystals via PEG polymer and accounts of its Mössbauer study.
Granular, needle-, rod-, or whisker-shaped gamma-Fe2O3 nanocrystals have been prepared via controlling the chemical microenvironment of the reaction system under gamma-irradiation. A novel extension-curl-effect model was proposed to explain the effect of the chemical microenvironment on the morphology of gamma-Fe2O3 nanocrystals. The as-prepared gamma-Fe2O3 nanocrystals were characterized by powder X-ray diffraction and transmission electron microscopy. Their magnetic properties were also studied by zero-field Mössbauer spectroscopy, which indicated that different shaped gamma-Fe2O3 nanocrystals could exhibit interesting magnetic behavior.
Xu
Fen
F
Structure Research Lab and Department of Chemistry, University of Science & Technology of China, Hefei, Anhui 230026, People's Republic of China.
Zhang
Xu
X
Xie
Yi
Y
Tian
Xiaobo
X
Li
Yuzhi
Y