Hydroxyapatite pattern formation in PVA gels

Yasushi Suetsugu*, Dominic Walsh, Junzo Tanaka, Stephen Mann

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

10 Citations (Scopus)

Abstract

Sodium hydroxide solution was allowed to diffuse from the edge of an acidic poly(vinyl alcohol) gel sheet containing dissolved calcium and phosphate ions, and calcium phosphate was observed to precipitate as the pH rose. The precipitation pattern changed depending on the solute concentration near the reaction front; precipitate "walls" were formed in areas in which the calcium phosphate concentration was higher or the sodium hydroxide concentration was lower than the conditions for homogeneous precipitation, and within a very limited concentration combination of calcium phosphate and sodium hydroxide, a regular stripe pattern with a pitch of about 100 mu m was formed. The calcium phosphate precipitate obtained was a single phase of hydroxyapatite. It was also found that apatite ceramic sheets with periodic porous structures or with undulate patterns could be manufactured by sintering gels with stripe patterns.

Original languageEnglish
Pages (from-to)5806-5814
Number of pages9
JournalJournal of Materials Science
Volume44
Issue number21
DOIs
Publication statusPublished - Nov 2009

Keywords

  • DICALCIUM PHOSPHATE DIHYDRATE
  • REACTION-DIFFUSION SYSTEMS
  • LIESEGANG PATTERNS
  • CALCIUM-PHOSPHATE
  • PRECIPITATION PATTERNS
  • PERIODIC PRECIPITATION
  • RAMAN
  • COMPOSITES
  • PHASE
  • RINGS

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