Ceramics-Silikáty 58, (2) 157 - 164 (2014) |
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AGING TIME AND SYNTHESIS PARAMETERS OF NANOCYSTALLINE SINGLE PHASE HYDROXYAPATITE PRODUCED BY A PRECIPITATION METHOD
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Bang Le Thi 1,2, Othman Radzali 1
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1 School of Materials and Mineral Resources Engineering, University Sains Malaysia,
14300 Nibong Tebal, Penang, Malaysia
2 Center for Advanced Manufacturing and Materials Processing, Department of Mechanical Engineering, University of
Malaya 50603 Kuala Lumpur, Malaysia
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Keywords: Hydroxyapatite, Aging time, Calcinations, Phase purity, Biomaterial
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Hydroxyapatite (HA) is the major inorganic component in hard tissue of the human body, such as dental and bone. However,
there is a great challenge to produce high purity phase HA with nano-size particles. In this research work, precipitation
method is a successful route to synthesize purity nanocrystalite hydroxyapatite (HA) at low temperature. The effects of
stirring speed and aging time during the precipitation process on the formation of nanocrystalline HA were investigated. The
results indicated that the stoichiometric pure HA powders with nano-sized, rod-like particles of about 8.7 - 20.7 nm in width
and 44.2 - 107.0 nm in length were successfully produced. In order to study the thermal stability, as-prepared HA powders
were calcined at different temperatures of 850, 1000 and 1200oC for 1 hour. It was concluded that purity HA had excellent
thermal stability up to 1200oC when the aging time is prolonged to 24 hours. |
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