Fabrication and characterization of highly porous calcium phosphate (CaP) ceramics by freezing foamed aqueous CaP suspensions

He Jin Yoon, Uoong Chul Kim, Ji Hwan Kim, Young Hag Koh, Won Young Choi, Hyoun Ee Kim

Research output: Contribution to journalArticle

9 Citations (Scopus)


Highly porous calcium phosphate (CaP) ceramics were fabricated by freezing foamed aqueous CaP suspensions with various CaP contents (15, 20, and 25 vol%) containing polyvinyl alcohol (PVA) as the binder and emulsifying agent. All the samples fabricated showed uniformly dispersed macropores, which were created by air bubbles introduced in the suspensions. In addition, aligned microporeswere formed in the sintered CaP walls as a replica of the preferentially grown ice dendrites during freezing when CaP contents of 15 and 20 vol% were used. The overall porosity decreased from 83 to 73 vol% with increasing initial CaP content from 15 to 25 vol%, whereas the compressive strengthand elastic modulus increased significantly from 1.2 ± 0.2 to 4.7 ± 0.9MPa and from 20 ± 11 to 163 ± 42 MPa, respectively. The samples showed good biocompatibility, as assessedby the in vitro cell test using a pre-osteoblast cell line.

Original languageEnglish
Pages (from-to)573-576
Number of pages4
JournalJournal of the Ceramic Society of Japan
Issue number1391
Publication statusPublished - 2011 Jul



  • Apatite
  • Biomedical applications
  • Mechanical properties
  • Porosity
  • Suspensions

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

Cite this