Preparation and characterization of Hydroxyapatite-Barium Titanate Composite

The present work deals with the synthesis and characterization of hydroxyapatite- barium titanate composite. The composites have been prepared varying the barium titanate amount in the range of 10- 40 weight% in the hydroxyapatite matrix. The barium titanate powders used in this study has been prepared following solid state synthesis technique, followed by the grinding in a pot mill. The synthesized barium titanate powders have been characterized using X-ray diffraction, particle size analysis and isoelectric point measurements. A stabilized barium titanate suspension has been prepared using Darvan-C polyelectrolyte at basic pH. Calcium nitrate tetrahydrate (Ca(NO3)2. 4H2O ) and di-ammonium hydrogen phosphate ((NH4)2HPO4) have been used as precursors for calcium (Ca2+) and phosphate ((PO4)3-) ions respectively, which were then precipitated over the stabilized barium titanate suspension. The suspension has been allowed to settle, washed with cold water and calcined to obtain the composite powders. The synthesized hydroxyapatite-barium titanate composites have been characterized using X-ray diffraction and dilatometry. The synthesized composite powders have been pelletized and sintered at three different temperatures. The sintered pellets have been characterized using bulk density, shrinkage and X-ray diffraction measurements. The pellets are coated with silver paste and have been characterized for their dielectric behavior using a dielectric interface.

[1]  B. Basu,et al.  Fundamentals of Biomaterials and Biocompatibility , 2010 .

[2]  L. A. Hidalgo-Bastida,et al.  Polarization of hydroxyapatite: influence on osteoblast cell proliferation. , 2010, Acta biomaterialia.

[3]  I. Mobasherpour,et al.  Synthesis of nanocrystalline hydroxyapatite by using precipitation method , 2007 .

[4]  J. Chaudhuri,et al.  Characterisation of ferroelectric-calcium phosphate composites and ceramics , 2007 .

[5]  A. Kareiva,et al.  Calcium hydroxyapatite, Ca10(Po4)6(OH)2 ceramics prepared by aqueous sol-gel processing , 2006 .

[6]  M. Buscaglia,et al.  Solid‐State Synthesis of Ultrafine BaTiO3 Powders from Nanocrystalline BaCO3 and TiO2 , 2005 .

[7]  Zhengwen Yang,et al.  Preparation and thermal stability analysis of hydroxyapatite derived from the precipitation process and microwave irradiation method , 2004 .

[8]  Jianfeng Chen,et al.  Preparation and properties of barium titanate nanopowder by conventional and high-gravity reactive precipitation methods , 2003 .

[9]  M. Ghorbani,et al.  The wet precipitation process of hydroxyapatite , 2003 .

[10]  K. Yamashita.  Enhanced Bioactivity of Electrically Poled Hydroxyapatite Ceramics and Coatings , 2003 .

[11]  M. Ghorbani,et al.  Some important factors in the wet precipitation process of hydroxyapatite , 2003 .

[12]  J. Ong,et al.  Growth of calcium phosphate on poling treated ferroelectric BaTiO3 ceramics. , 2002, Biomaterials.

[13]  S. Nakamura,et al.  Enhanced osteobonding by negative surface charges of electrically polarized hydroxyapatite. , 2001, Journal of biomedical materials research.

[14]  B. Rand,et al.  Polymeric stabilisation of aqueous suspensions of barium titanate. Part II: Effect of polyelectrolyte concentration , 2000 .

[15]  B. Rand,et al.  Polymeric stabilisation of aqueous suspensions of barium titanate. Part I: Effect of pH , 2000 .

[16]  A. Tas.  Synthesis of biomimetic Ca-hydroxyapatite powders at 37°C in synthetic body fluids , 2000 .

[17]  K. Yamashita,et al.  Dielectric Properties of Poled Hydroxyapatite Ceramics , 2000 .

[18]  C. Gómez-Yáñez,et al.  Mechanical activation of the synthesis reaction of BaTiO3 from a mixture of BaCO3 and TiO2 powders , 2000 .

[19]  L L Hench,et al.  Biomaterials: a forecast for the future. , 1998, Biomaterials.

[20]  Xing‐dong Zhang,et al.  Promotion of osteogenesis by a piezoelectric biological ceramic , 1997 .

[21]  X Zhang,et al.  Promotion of osteogenesis by a piezoelectric biological ceramic. , 1997, Biomaterials.

[22]  K. Yamashita,et al.  Acceleration and Deceleration of Bone-Like Crystal Growth on Ceramic Hydroxyapatite by Electric Poling , 1996 .

[23]  W. Zhong,et al.  Preparation of BaTiO3 by the Hydrothermal Method. , 1996 .

[24]  H. Owada,et al.  Electrical conductivity of calcium phosphate ceramics with various Ca/P ratios , 1991 .