A step toward control of the surface structure of biomimetic hydroxyapatite nanoparticles: Effect of carboxylates on the {010} P-rich/Ca-rich facets ratio

Yuriy Sakhno, Pavlo Ivanchenko, Michele Iafisco, Anna Tampieri, Gianmario Martra

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Two types of biomimetic hydroxyapatite (HA) nanoparticles were prepared by acid-base neutralization reactions, using Ca(OH)2 or Ca(CH3COO)2 as a calcium source, to evaluate the effect of acetate anions on particle formation. High-resolution transmission electron microscopy observations provided evidence that in both cases nanoparticles are elongated along the c-axis, but to a more limited extent when prepared in the presence of acetates, and are mainly limited by {010} facets. IR spectra of nanoparticles containing adsorbed CO revealed that the actual termination of these are both of the {010}-Ca-rich and {010}-P-rich type, the latter being significantly more abundant for HA nanoparticles grown in the medium containing CH3COO- species. Moreover, these nanoparticles appeared to be more sensitive toward aggregative stacking by thermal treatment, resulting in a significant decrease in specific surface area, while retaining the size of primary particles.

Original languageEnglish (US)
Pages (from-to)5928-5937
Number of pages10
JournalJournal of Physical Chemistry C
Volume119
Issue number11
DOIs
StatePublished - Mar 19 2015

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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