Publication detail

Direct synthesis of nanocrystalline hydroxyapatite by hydrothermal hydrolysis of alkylphosphates

CIHLÁŘ, J. ČÁSTKOVÁ, K.

Original Title

Direct synthesis of nanocrystalline hydroxyapatite by hydrothermal hydrolysis of alkylphosphates

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

6

State

Republic of Austria

Pages from

761

Pages to

771

Pages count

11

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"
}