Publication detail

Direct synthesis of nanocrystalline hydroxyapatite by hydrothermal hydrolysis of alkylphosphates

CIHLÁŘ, J. ČÁSTKOVÁ, K.

Original Title

Type

journal article - other

Language

English

Original Abstract

The influence of reaction conditions (temperature, type of catalyst, time) on the base-catalyzed reaction of mono-, di-, and trialkylphosphates (alkyl=methyl, ethyl, i-propyl, n-butyl) with Ca2+ ions and on the structure and composition of the reaction products was studied. The composition of the calcium phosphates depends mainly on the reaction temperature. At temperatures below 100 degC, a nanocrystalline solid products transforming into dicalcium phosphate by heating (calcination) was found.Pure nanocrystalline hydroxyapatite was prepared by hydrothermal synthesis at 160 degC from mono- and dialkylphosphates. The size of hydroxyapatite crystallites was about 1 nm, the particle size about 150 um. Agglomerated particles of hydroxyapatite larger than 2 um were prepared at 200 degC. Hydrothermal reaction of trialkylphosphates with Ca2+ ions at 200 degC produced CaHPO4. The experimental results were used to propose a reaction mechanism for base-catalyzed hydrothermal reactions of alkylphosphates with Ca2+ ions.

Keywords

ceramics, synthesis, nanostructures, hydroxyapatite, hydrothermal synthesis, alkylphosphates

Authors

CIHLÁŘ, J.; ČÁSTKOVÁ, K.

RIV year

2002

Released

1. 1. 2002

ISBN

0026-9247

Periodical

Monatshefte fuer Chemie

Year of study

133

Number

State

Republic of Austria

Pages from

761

Pages to

771

Pages count

BibTex

@article{BUT40849,
  author="Jaroslav {Cihlář} and Klára {Částková}",
  title="Direct synthesis of nanocrystalline hydroxyapatite by hydrothermal hydrolysis of alkylphosphates",
  journal="Monatshefte fuer Chemie",
  year="2002",
  volume="133",
  number="6",
  pages="11",
  issn="0026-9247"
}