Gel oxidation of titanium and effect of UV irradiation on precipitation of hydroxyapatite from simulated body fluid
Sodium titanate gels on the surface of titanium metal have been formed using sodium hydroxide solution and oxidised at 40O0-800°C. The reaction sequence for these processes with increasing temperature is Ti -->. sodium titanate gel -->, crystalline sodium titanate gel --> porous (top) and d...
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| Main Authors: | , |
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| Format: | Article |
| Published: |
Trans Tech Publications
2012
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| Online Access: | http://dx.doi.org/10.4028/www.scientific.net/AMR.488-489.1229 http://dx.doi.org/10.4028/www.scientific.net/AMR.488-489.1229 http://eprints.uthm.edu.my/3879/1/hasan_zuhudi_2_U.pdf |
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| Summary: | Sodium titanate gels on the surface of titanium metal have been formed using sodium
hydroxide solution and oxidised at 40O0-800°C. The reaction sequence for these processes with
increasing temperature is Ti -->. sodium titanate gel -->, crystalline sodium titanate gel --> porous
(top) and dense (bottom) anatase + porous (top) and dense (bottom) rutile. These samples
subsequently were soaked in simulated body fluid in order to study the precipitation of
hydroxyapatite in the absence and presence of long UV radiation, which has not been investigated
before. One sample showed greatly enhanced hydroxyapatite deposition, this being the one
oxidised at 400°C, consisting of small amounts of crystalline sodium titanate and anatase, and
subjected to UV irradiation. More generally, enhancement of hydroxyapatite precipitation is
observed in the presence of anatase and/or sodium titanate; suppression of hydroxyapatite
precipitation is observed in the presence of gels and rutile. However, UV light with anatase
enhanced precipitation while W light with rutile suppressed it. This is attributed to the
morphological effect of the larger grain of rutile compared to the smaller anatase. |
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