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Growth mechanism of single-crystal alpha-Al2O3 nanofibers fabricated by electrospinning techniques

Title
Growth mechanism of single-crystal alpha-Al2O3 nanofibers fabricated by electrospinning techniques
Author
Wolfgang M. Sigmund
Keywords
Al2O3; Fibers; Calcination; Electrospinning.
Issue Date
2011-05
Publisher
Elsevier Science B.V., Amsterdam.
Citation
Journal of the European Ceramic Society,Vol.31, No.5 [2011],723-731
Abstract
Crystal-growth-related microstructures and the length-to-diameter ratio of a single-crystal-type α-Al 2 O 3 nanofiber were examined using HR-TEM techniques. The fibers exhibited diameters ranging from 50 to 100nm and lengths of several tens of micrometers. During thermal treatments, the alumina fiber went through phase transformations similar to boehmite. Therefore, the phase evolution, especially the final θ- to α-Al 2 O 3 stage of the phase transformation, may be the determining factor in the microstructural evolution of the nanofibers. HR-TEM techniques were utilized to demonstrate that the single crystals were formed by the coalescence of well-elongated α-Al 2 O 3 colonies. The fibers grew in the [110] or [112] direction instead of [001]. A thermodynamic analysis revealed that if the α-Al 2 O 3 nanofiber that transformed from θ-Al 2 O 3 behaved in a stable manner, there could be a size ratio limit for the length and diameter of each α-Al 2 O 3 colony. The smallest potential diameter was calculated to be around 17nm.
URI
http://www.sciencedirect.com/science/article/pii/S0955221910005303?_rdoc=1&_fmt=high&_origin=gateway&_docanchor=&md5=b8429449ccfc9c30159a5f9aeaa92ffbhttp://hdl.handle.net/20.500.11754/66635
ISSN
0955-2219
DOI
10.1016/j.jeurceramsoc.2010.11.011
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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