Detail publikace
Direct synthesis of nanocrystalline hydroxyapatite by hydrothermal hydrolysis of alkylphosphates
CIHLÁŘ, J. ČÁSTKOVÁ, K.
Originální název
Direct synthesis of nanocrystalline hydroxyapatite by hydrothermal hydrolysis of alkylphosphates
Typ
článek v časopise - ostatní, Jost
Jazyk
angličtina
Originální abstrakt
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.
Klíčová slova
ceramics, synthesis, nanostructures, hydroxyapatite, hydrothermal synthesis, alkylphosphates
Autoři
CIHLÁŘ, J.; ČÁSTKOVÁ, K.
Rok RIV
2002
Vydáno
1. 1. 2002
ISSN
0026-9247
Periodikum
Monatshefte fuer Chemie
Ročník
133
Číslo
6
Stát
Rakouská republika
Strany od
761
Strany do
771
Strany počet
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"
}