Formation of organically modified octacalcium phosphate in solutions containing various amounts of benzenedicarboxylic acids

Taishi Yokoi, Masanobu Kamitakahara, Masakazu Kawashita, Chikara Ohtsuki

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Octacalcium phosphate (OCP) has a layered structure composed of apatitic and hydrated layers. HPO42- in the hydrated layer can be substituted by dicarboxylate ions. We investigated formation of OCP with incorporated dicarboxylate ions, namely octacalcium phosphate carboxylate (OCPC), under synthetic conditions with various concentrations of benzenedicarboxylic acids (BDCAs) such as 1,2-benzenedicarboxylic acid (1,2BDCA, phthalic acid), 1,3-benzenedicarboxylic acid (1,3BDCA, iso-phthalic acid), and 1,4-benzenedicarboxylic acid (1,4BDCA, terephthalic acid). 1,3BDCA or a small amount of 1,2BDCA could be incorporated into OCP, but 1,4BDCA could not be incorporated into OCP. When the added amount of 1,3BDCA was larger than 2 mmol, OCPC with 1,3BDCA (1,3BDCA-OCPC) was formed with dicarboxylate-free OCP (Pure-OCP). The fractions of 1,3BDCA-OCPC with respect to Pure-OCP increased with increasing amounts of 1,3BDCA. When excessive amounts of 1,3BDCA, namely 25 times with respect to the stoichiometric composition of OCPC, were used for formation of OCPC, 1,3BDCA-OCPC was formed as a single phase. Addition of excessive amounts of 1,3BDCA prevented formation of Pure-OCP and had an advantage in formation of 1,3BDCA-OCPC.

Original languageEnglish
Pages (from-to)219-225
Number of pages7
JournalJournal of the Ceramic Society of Japan
Volume121
Issue number1410
DOIs
Publication statusPublished - 2013 Feb

Keywords

  • Benzenedicarboxylic acids
  • Octacalcium phosphate
  • Organic modification
  • Substitution
  • Wet chemical process

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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