Characterization And Properties Of Synthesized And Sintered Carbonated Hydroxyapatite

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dc.contributor.authorBaba Ismail, Yanny Marliana
dc.date.accessioned2018-08-29T08:10:21Z
dc.date.available2018-08-29T08:10:21Z
dc.date.issued2011-05
dc.description.abstractB-type Carbonated Hydroxyapatite (CHA) was successfully synthesized via nanoemulsion method, through dropwise (DW) and direct pouring (DP) techniques. The carbonate content in DP (8.60%) was higher than DW (7.85%). Both techniques produced nano-sized powders with variation in shapes of particles. It was also found that at temperature (≤ 40°C), the CHA powders were angular while above this critical temperature mixture of rods and angular shape was produced. Room temperature synthesis was better as they produced nano-size CHA with larger surface area. Sintering was then performed on pure CHA, CHA+Mg(OH)2, HA and HA+Mg(OH)2, samples which was cooled down with and without wet CO2 atmosphere to produce different type of carbonate substitution in the structure. Pure B-type CHA was successfully retained when pure CHA and CHA+Mg(OH)2 was sintered at 700-900°C, with the latter reaching optimum densification at temperature of 800°C (CM2C). Other samples required higher temperature for densification. The carbonate content was also different with CM2C having highest 4.30 wt%. AB-type CHA and A-type CHA was formed for densest sintered samples using HA+Mg(OH)2 and HA as starting material. The use of Mg(OH)2 had successfully reduce the sintering temperature and improve the densification of the sintered samples through Liquid-Phase Sintering. The use of wet CO2 atmosphere was successfull to compensate the carbonate loss during sintering. The hardness, K1c, and DTS values obtained for densest CM2C were 2.37 GPa, 3.27 MPa.m1/2, and 22.95 MPa, respectively, and shows a better bioactivity by rapid formation of apatite crystals. Thus, an enhancement of sintered CHA properties was successfully achieved in this study.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/6467
dc.language.isoenen_US
dc.publisherUniversiti Sains Malaysiaen_US
dc.subjectB-type Carbonated Hydroxyapatite was successfullyen_US
dc.subjectsynthesized via nanoemulsion methoden_US
dc.titleCharacterization And Properties Of Synthesized And Sintered Carbonated Hydroxyapatiteen_US
dc.typeThesisen_US
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