The phase evolution and microstructure of silicon doped tricalcium phosphate
Silicon diffusing from a quartz or silicon substrate into a precipitated calcium hydroxyapatite (HA) coating during firing at 1000°C gives rise to a multiphase thin film material bearing unique bioactive properties. The identification of the role of silicon in this process to form a silicon stabiliz...
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| Format: | Dissertation |
| Language: | English |
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ProQuest Dissertations & Theses
01-01-2005
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| Online Access: | Get full text |
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| Summary: | Silicon diffusing from a quartz or silicon substrate into a precipitated calcium hydroxyapatite (HA) coating during firing at 1000°C gives rise to a multiphase thin film material bearing unique bioactive properties. The identification of the role of silicon in this process to form a silicon stabilized tricalcium phosphate (Si-TCP) has allowed the technology to be transferred to the fabrication of bulk ceramic materials through the addition of silica (SiO2) powder to an HA precipitate prior to firing. The properties of these powders and thin films provide information on the development of the material. Pure and silicon doped hydroxyapatite powder has been investigated as a simple model of the multiphase Si-TCP. Bulk powder was investigated using attenuated total reflection infrared spectroscopy. Peaks associated with silicate in HA are found to increase with Si doping while PO43- and OH- absorption peaks are reduced confirming Si substitution of P sites. A negative surface charge on Si doped HA and Si-TCP powders is found using zeta potential measurements. (Abstract shortened by UMI.) |
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| ISBN: | 0494132345 9780494132340 |