Nano-sized ceramic particles of hydroxyapatite calcined with an anti-sintering agent

Masahiro Okada, Tsutomu Furuzono

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Nano-sized crystals of calcined hydroxyapatite (HAp) having spherical morphologies were fabricated by calcination at 800°for 1 h with an anti-sintering agent surrounding the original HAp particles and the agent was subsequently removed by washing after calcination. The original HAp particles were prepared by a modified emulsion system, and surrounded with poly(acrylic acid, calcium salt) (PAA-Ca) by utilizing a precipitation reaction between calcium hydroxide and poly(acrylic acid) adsorbed on the HAp particle surfaces in an aqueous medium. In the case of calcination without PAA-Ca, micron-sized particles consisting of sintered polycrystals were mainly observed by scanning electron microscopy, indicating the calcination-induced sintering among the crystals. On the other hand, most of the crystals calcined with the anti-sintering agent were observed as isolated particles, and the mean size of the HAp crystals was around 80 nm. This result indicates that PAA-Ca and its thermally decomposed product, CaO, surrounding the HAp crystals could protect them against calcination-induced sintering during calcination at 800°The HAp crystals calcined with PAA-Ca showed high crystallinity, and no other calcium phosphate phases could be detected.

Original languageEnglish
Pages (from-to)848-851
Number of pages4
JournalJournal of Nanoscience and Nanotechnology
Volume7
Issue number3
DOIs
Publication statusPublished - Mar 2007
Externally publishedYes

Fingerprint

Ceramics
Durapatite
Hydroxyapatite
Calcination
Sintering
carbopol 940
Crystals
Acrylics
Calcium Hydroxide
Hydrated lime
Acids
Polycrystals
Calcium phosphate
Emulsions
Particle Size
Washing
Electron Scanning Microscopy
Calcium
Salts
Scanning electron microscopy

Keywords

  • Calcination
  • Ceramics
  • Dispersibility
  • Hydroxyapatite
  • Nano

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Materials Science (miscellaneous)
  • Engineering (miscellaneous)

Cite this

Nano-sized ceramic particles of hydroxyapatite calcined with an anti-sintering agent. / Okada, Masahiro; Furuzono, Tsutomu.

In: Journal of Nanoscience and Nanotechnology, Vol. 7, No. 3, 03.2007, p. 848-851.

Research output: Contribution to journalArticle

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