Hydroxyapatite nano sol prepared via a mechanochemical route

S. Nakamura, T. Isobe, M. Senna

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


Well-dispersed sol with crystalline hydroxyapatite (HAp) was obtained directly by milling a mixture comprising Ca(OH)2, an aqueous solution of H3PO4 and a dispersant, an ammonium salt of polyacrylic acid. The average crystallite size of HAp was below 20 nm. Ca/P molar ratio of the product was 1.51 ± 0.04, i.e. Ca deficient from stoichiometric HAp. Minimum apparent viscosity was attained at a dispersant concentration 0.92wt% of sol. An as-milled sol was diluted by a factor 10-2.61 solid wt% to give a Newtonian fluid of 2 mPas. From the diluted sol, we obtained a few μm thick dense film of HAp by dip coating on the slide glass precoated by chitosan.

Original languageEnglish
Pages (from-to)57-61
Number of pages5
JournalJournal of Nanoparticle Research
Issue number1
Publication statusPublished - 2001


  • Gelation
  • Hydroxyapatite
  • Mechanochemical reaction
  • Nano sol
  • Rheological properties

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • Atomic and Molecular Physics, and Optics
  • Modelling and Simulation
  • General Materials Science
  • Condensed Matter Physics


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