Hydrothermal synthesis of hydroxyapatite whiskers with sharp faceted hexagonal morphology

Inés S. Neira, Francisco Guitián, Takaaki Taniguchi, Tomoaki Watanabe, Masahiro Yoshimura

Research output: Contribution to journalArticlepeer-review

87 Citations (Scopus)


We report an effective method for the synthesis of hydroxyapatite whiskers with sharp faceted hexagonal shape employing a low temperature (90 °C) hydrothermal route with calcium nitrate tetrahydrate, diammonium phosphate and urea as starting materials. The key parameters of the synthesis process i.e. duration, temperature cycle of the treatment and starting pH value are carefully varied and the end products are investigated using powder X-ray diffraction (XRD), Raman-scattering, infrared spectroscopy (IR), elemental analysis, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), electron diffraction (ED), and high-resolution TEM (HRTEM) in order to find the optimal reaction conditions that lead to the desired hexagonal morphology of HA whiskers. The results demonstrate that gradual and greater increase in solution pH during the hydrothermal process favors large quantity of the single-crystalline hydroxyapatite whiskers with well defined hexagonal morphology.

Original languageEnglish
Pages (from-to)2171-2178
Number of pages8
JournalJournal of Materials Science
Issue number7
Publication statusPublished - 2008 Apr

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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