Influence of calcination conditions on dispersibility and phase composition of hydroxyapatite crystals calcined with anti-sintering agents

Masahiro Okada, Yuko Omori, Mayuko Awata, Tsubasa Shirai, Naoyuki Matsumoto, Shoji Takeda, Tsutomu Furuzono

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We investigated the influence of calcination conditions to fabricate dispersible hydroxyapatite (HAp) nanocrystals via calcination with an anti-sintering agent, poly(acrylic acid, calcium salt) (PAA-Ca), surrounding the nanocrystals. First, two kinds of low crystallinity HAp nanoparticles with spherical morphology (58 nm in diameter) and rod-shaped morphology (around 350 nm in length) were synthesized by wet chemical processes, and then coated with PAA-Ca in aqueous media. The HAp/PAA-Ca mixture was dried and calcined at 800 or 1,000°C for 1 h. The resultant mixture was finally washed with aqueous media to remove CaO-the thermally decomposed product of PAA-Ca-surrounding the nanocrystals. The calcination-induced sintering between the nanocrystals was efficiently prevented by increasing the amount of PAA-Ca, but the increased amount of PAA-Ca also led to the formation of CaCO3 due to the incomplete thermal decomposition of PAA-Ca at 800°C for 1 h. Highly dispersible and phase pure HAp nanocrystals could be obtained by calcination at higher temperature (1,000°C). We also found that calcium ions were migrated from the anti-sintering agent into the HAp nanocrystals, and the degree of calcium ion migration varied by the nature of the low crystallinity HAp nanoparticles and the calcination temperature.

Original languageEnglish
Article number2469
JournalJournal of Nanoparticle Research
Volume16
Issue number7
DOIs
Publication statusPublished - Jul 2014
Externally publishedYes

Keywords

  • Anti-sintering agent
  • Calcination
  • Dispersible
  • Hydroxyapatite
  • Nanoparticle

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Modelling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics

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