Synthesis of calcium phosphate crystals in a silica hydrogel containing phosphate ions

Taishi Yokoi, Masakazu Kawashita, Giichiro Kawachi, Koichi Kikuta, Chikara Ohtsuki

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Calcium phosphate crystals were synthesized by diffusing calcium ions into silica hydrogels containing phosphate ions. Hydroxyapatite [HAp, Ca 10(PO4)6(OH)2] and octacalcium phosphate [OCP, Ca8(HPO4)2(PO4) 4·5H2O] with different types of crystal morphology were formed in the gel. The HAp had an irregular or rod shape, a few micrometers in length, while the OCP had an irregular, spherulite, rod- or ribbonlike shape, ranging in size from a few micrometers to several tens of micrometers, depending on the amount of phosphoric acid added and the reaction temperature. The morphology of the OCP changed from an irregular shape to a ribbonlike or rod shape, via a spherulite shape, depending on the amount of phosphoric acid added and the reaction temperature. The changes in crystal morphology of the HAp and OCP were ascribed to the degree of supersaturation of the reaction environment and the rate-determining step in the HAp and OCP crystal growth mechanism.

Original languageEnglish
Pages (from-to)2154-2160
Number of pages7
JournalJournal of Materials Research
Volume24
Issue number6
DOIs
Publication statusPublished - 2009 Jun

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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