Effect of colloidal silica addition on the formation of porous spherical α-calcium orthophosphate agglomerates by spray pyrolysis technique(<Feature>Aqueous Solution Science for Ceramic Processing II)

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概要

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• The effect of colloidal silica (SiO_2; CS) addition on the formation of porous spherical α-calcium orthophosphate (α-Ca_3(PO_4)_2; α-TCP) agglomerates has been examined. The starting powder was prepared by the spray pyrolysis of calcium phosphate (Ca/P ratio=1.50) solution containing 0.9mol・dm^<-3> Ca(NO_3)_2, 0.6mol・dm^<-3> (NH_4)_2HPO_4, CS (mean particle size; 14, 24 and 39nm) and concentrated HNO_3 at 600℃, using an air-liquid nozzle; the amounts of CS in the spray-pyrolyzed powder were adjusted to be 0.1-0.4mass%. The heat-treatment of spray-pyrolyzed power with 0.4mass% of CS addition at 1200℃ for 10min showed that the transformation from β- to α-TCP was restricted as the diameter of CS decreased from 24 to 14nm. The heat-treatment of spray-pyrolyzed powder containing 0.1mass% of CS (mean diameter: 24nm) at 1200℃ for 10min resulted in not only the complete transformation of β- to α-TCP but also preservation of original spherical framework. The immersion of porous spherical α-TCP agglomerates in simulated body fluid (SBF) brought about the rapid formation of hydroxyapatite, due to higher specific surface area (17.0m^2・g^<-1>) compared to that of commercial powder (10.9m^2・g^<-1>). The hardened body with the porosity of 66.3% could be fabricated by mixing the calcium-phosphate paste with 50mass% of the present porous α-TCP agglomerates, using the malaxation liquid. Immersion of this hardened body in SBF at 37.0℃ resulted in the formation of hydroxyapatite within three days.

• 2009-03-01

著者

• DAVIES Ian

  上智大学理工学部

• Umeda Tomohiro

  Department of Neuroscience and Neurology, Osaka City University Medical School

• DAVIES Ian

  航空宇宙技術研究所

• Umeda Tomohiro

  Department Of Biological Science And Technology Science University Of Tokyo

• DAVIES Ian

  Department of Mechanical Engineering, Curtin University of Technology

• Davies I

  Kyoto Inst. Technol. Kyoto Jpn

• Davies Ian

  Department Of Mechanical Engineering Curtin University Of Technology

• Davies Ian

  Dep. Of Mechanical Engineering Curtin Univ. Of Technol.

• Davies Ian

  京都工芸繊維大学

• KODA Seiichiro

  Department of Chemistry, Faculty of Science and Technology, Sophia University

• Itatani K

  Department Of Chemistry Faculty Of Science And Technology Sophia University

• Itatani Kiyoshi

  Dep. Of Materials And Life Sciences Fac. Of Sci. And Engineering Sophia Univ.

• Koda Seiichiro

  Dep. Of Materials And Life Sciences Fac. Of Sci. And Engineering Sophia Univ.

• ITATANI Kiyoshi

  Department of Chemistry, Faculty of Science and Technology, Sophia University

• OOE Ari

  Department of Materials and Life Sciences, Sophia University

• MUSHA Yoshiro

  Department of Orthopaedic Surgery, School of Medicine, Toho University

• Koda Seiichiro

  Department Of Chemical Engineering Facutly Of Engineering The University Of Tokyo

• Ooe Ari

  Department Of Materials And Life Sciences Sophia University

• Davies Ian

  Department Of Mechanical Engineering Curtin University

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