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In-situ fabrication of porous hydroxyapatite (HA) scaffolds with dense shells by freezing HA/camphene slurry

Authors
Yoon, Byung-HoPark, Chee-SungKim, Hyoun-EeKoh, Young-Hag
Issue Date
15-Apr-2008
Publisher
ELSEVIER SCIENCE BV
Keywords
freeze casting; porous; dense; hydroxyapatite; strength
Citation
MATERIALS LETTERS, v.62, no.10-11, pp.1700 - 1703
Indexed
SCIE
SCOPUS
Journal Title
MATERIALS LETTERS
Volume
62
Number
10-11
Start Page
1700
End Page
1703
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/123729
DOI
10.1016/j.matlet.2007.09.063
ISSN
0167-577X
Abstract
We fabricated a novel type of porous HA scaffold with a dense shell/porous core structure by freezing a hydroxyapatite (HA)/camphene slurry in-situ. During freezing, the camphene dendrites from the mold wall grew 2-dimensionally by pushing the HA particles into the remaining slurry, which resulted in the formation of a camphene layer/concentrated HA particles layer as the surrounding skin of the sample. After removing the frozen camphene and sintering the HA walls at 1250 degrees C for 3 h, a dense shell integrated with a porous core was formed in-situ. We prepared two types of porous HA scaffold, a porous HA cylinder with a dense shell and a 3-D HA scaffold, consisting of periodic HA networks with a dense shell/porous core structure. These novel scaffolds would be expected to have improved mechanical integrity due to the use of a dense shell, as well as efficient bone ingrowth inside pores formed in a porous core. (c) 2007 Elsevier B.V. All rights reserved.
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