In situ generated dense shell-engaged Ostwald ripening: A facile controlled-preparation for BaFe{sub 12}O{sub 19} hierarchical hollow fiber arrays

Journal Article · Mon Mar 15 00:00:00 EDT 2010 · Journal of Solid State Chemistry

OSTI ID:21372547

This paper describes a simple and convenient approach to fabricate BaFe{sub 12}O{sub 19} hierarchical hollow fibers or hollow fiber arrays by heat-treating electrospun solid fibers or fiber arrays using a deliberately devised two-step heat-treatment process, in which the dense shells generated in situ during the short-time pre-treatment procedure direct Ostwald ripening of flake-shaped BaFe{sub 12}O{sub 19} nanocrystals in the elevated temperature heat-treatment procedure. The heat-treatment temperature has a strong effect on the structure and magnetic properties of the BaFe{sub 12}O{sub 19} hierarchical hollow fibers and the resulting BaFe{sub 12}O{sub 19} hierarchical hollow fiber arrays show a slight magnetic anisotropy as well as high coercivity. The in situ generated dense shell-engaged directing Ostwald ripening approach reported here can be readily extended to fabricate other metal oxides hollow fibers, and the resulting BaFe{sub 12}O{sub 19} hierarchical hollow fibers or hollow fiber arrays are promised to have use in a number of applications that involve microwave absorber, magnetic separation, and so forth. - Graphical abstract: This paper described a simple and convenient approach that allows for the facile fabrication of BaFe{sub 12}O{sub 19} hierarchical nanotubes or nanotube arrays by a deliberately devised two-step heat-treatment process, in which the dense shells generated in situ during the short-time pre-treatment procedure direct Ostwald ripening of flake-shaped BaFe{sub 12}O{sub 19} nanocrystals in the elevated temperature heat-treatment procedure.

• OSTI ID: 21372547
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 3 Vol. 183; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
BARIUM COMPOUNDS
COERCIVE FORCE
ELECTROMAGNETIC RADIATION
ENERGY
FABRICATION
FERRIMAGNETIC MATERIALS
FERRITES
FIBERS
HEAT
HEAT TREATMENTS
IRON COMPOUNDS
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MATERIALS
MICROWAVE RADIATION
NANOSTRUCTURES
NANOTUBES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATIONS
RIPENING
SHELLS
TRANSITION ELEMENT COMPOUNDS