Formation of c-axis-oriented columnar structures through controlled epitaxial growth of hydroxyapatite

Wensi Wang, Yuya Oaki, Chikara Ohtsuki, Takayoshi Nakano, Hiroaki Imai

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


Hydroxyapatite (HA) nanorods elongated in the c axis were produced at 38-80 °C in an aqueous solution system that was based on simulated body fluid. Specific columnar structures consisting of HA nanorods were produced through epitaxial growth on a c-face HA substrate under a mildly acidic condition. The morphology of the columnar structure was controlled by changing the growth condition and adding amino acid. The length and width of the columns were varied in a range from several tens of nanometers to several micrometers. Densely packed columns were produced with hexagonal HA rods at 80 °C. Fibrous columns of HA with gaps were formed at 60 °C in the presence of aspartic acid. The Young's modulus of the densely packed HA columns was comparable to those of a human enamel and a rabbit bone oriented in c axis. The columnar structures can contribute to controlling the mechanical performance of biological and biomedical HA crystals.

Original languageEnglish
Pages (from-to)143-148
Number of pages6
JournalJournal of Asian Ceramic Societies
Issue number2
Publication statusPublished - 2013 Jun


  • Bioceramics
  • Calcium phosphate
  • Mechanical property
  • Self-organization

ASJC Scopus subject areas

  • Ceramics and Composites


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