Electronic states spectroscopy of Hydroxyapatite ceramics

Photoluminescence, surface photovoltage spectroscopy and high-resolution characterization methods (Atomic Force Microscopy, Scanning Electron Microscopy, X-ray spectroscopy and DC conductivity) are applied to nanostructured Hydroxyapatite (HAp) bioceramics and allowed to study electron (hole) energy states spectra of the HAp and distinguish bulk and surface localized levels. The measured trap spectra show strong sensitivity to preliminary heat treatment of the ceramics. It is assumed that found deep electron (hole) charged states are responsible for high bioactivity of the HAp nanoceramics.

[1]  K. Yamashita,et al.  Huge, Millicoulomb Charge Storage in Ceramic Hydroxyapatite by Bimodal Electric Polarization , 2002 .

[2]  N. A. Surplice,et al.  A critique of the Kelvin method of measuring work functions , 1970 .

[3]  Michael Jarcho,et al.  Calcium phosphate ceramics as hard tissue prosthetics. , 1981, Clinical orthopaedics and related research.

[4]  K. Groot Bioceramics consisting of calcium phosphate salts. , 1980 .

[5]  Besim Ben-Nissan,et al.  Nanoceramics in Biomedical Applications , 2004 .

[6]  G W Marshall,et al.  Bioactive glass coatings with hydroxyapatite and Bioglass particles on Ti-based implants. 1. Processing. , 2000, Biomaterials.

[7]  K. Yamashita,et al.  Thermal Instability and Proton Conductivity of Ceramic Hydroxyapatite at High Temperatures , 1995 .

[8]  Y. Bando,et al.  A comparative study of ultrastructures of the interfaces between four kinds of surface-active ceramic and bone. , 1992, Journal of biomedical materials research.

[9]  H. Takeda,et al.  Proton transport polarization and depolarization of hydroxyapatite ceramics , 2001 .

[10]  H. Gatos,et al.  Electronic characteristics of “real” CdS surfaces , 1972 .

[11]  A S Posner,et al.  Crystal chemistry of bone mineral. , 1969, Physiological reviews.

[12]  W. Ching,et al.  Electronic structure and bonding in calcium apatite crystals: Hydroxyapatite, fluorapatite, chlorapatite, and bromapatite , 2004 .

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

[14]  Y. Bando,et al.  Differences in ceramic-bone interface between surface-active ceramics and resorbable ceramics: a study by scanning and transmission electron microscopy. , 1992, Journal of biomedical materials research.

[15]  J. Jansen,et al.  Thin Calcium Phosphate Coatings for Medical Implants , 2009 .

[16]  L. Kronik,et al.  Surface photovoltage phenomena: theory, experiment, and applications , 1999 .

[17]  P. Ducheyne,et al.  Quasi-biological apatite film induced by titanium in a simulated body fluid. , 1998, Journal of biomedical materials research.