Synthesis and application of calcium phosphate fibers/whiskers
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[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] Calcium phosphate is the main inorganic constituent of human hard tissues such as bone and teeth. It has been studied extensively and used clinically because of its excellent biocompatibility and bioactivity. Calcium phosphate fibers/whiskers have gained much attention in biomedical composites since they can increase not only the biocompatibility but also the mechanical strength of biomedical composite. In the present study, high purity and super-long octacalcium phosphate (OCP, Ca8(HPO4)2(PO4)4∙5H2O) fibers with the maximum length of 500 μm were successfully synthesized by homogeneous precipitation method. Incorporation of 5% mass fraction of OCP nanofibers into the OCP/PLA composite can improve the flexural and tensile strength of OCP/PLA composite. In addition, hydroxyapatite ((HA), Ca10(PO4)6(OH)2) whiskers with 500 nm in diameter were fabricated in molten salt with two-step calcinations. The flexural and tensile strength of HA/PLA composite could be improved with 5 % mass fraction HA whiskers and be maintained when the mass fraction of HA whiskers was increased into 10%.
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