Photonic crystals in biology

Poster Session, Tuesday, June 15
Theme A1 - B702
Nano TiO 2 Doped Hydroxyapatite Composites
Azade Yelten
1 , Suat Yilmaz 1 *, S. Agathopoulos, 2 and Faik Nuzhet Oktar, 3-4
1 Department of Metallurgical and Materials Engineering, Istanbul University, 34320, Avcilar, Istanbul, Turkey
2 Materials Science and Engineering Department, Ioannina University, Greece
3 Department of Radiology, School of Health Related Professions , Marmara University, Istanbul, Turkey
4 Nanotechnology and Biomaterials Application and Research Centre, Marmara University, Istanbul 34722, Turkey
Abstract-We predict here that nano-dopants in correct amounts could be very useful to prepare hydroxyapatite (HA) composites, which were
not be used at load-barrier conditions. Here show that nano dopants could be effective if correct amounts in the HA matrix will used.
The number of treated skeletal deficiencies steadily
increases in a global scale. Effective ways for bone
replacements and enhancement of bone formation together
with research directed to find ideal biomaterials for grafting
purposes, which will feature biocompatibility and production
simplicity and economy, are required. Hydroxyapatite (HA,
Ca 10 (PO 4 ) 6 (OH) 2 ), the main mineral component of bones and
teeth, is among the leading biomaterials satisfying these
requirements. Nevertheless, pure HA features low mechanical
strength and fracture toughness, which limit their use in loadbearing
applications [1]. The applications of pure HA are
restricted to non load-bearing implants due to the poor
mechanical properties of HA. Doping with (biocompatible or
even better bioactive) oxides may result in strong HA
composites [2]. There are lots of studies using various oxides,
whiskers in the literature but they are almost nothing about
adding nano-dopants into HA matrix in the recent literature.
The aim of this study is to produce stronger HA composites
adding nano-dopands than regular composites.
Calcined (at 850 °C) HA powder was produced from fresh
bovine femoral bones (BHA). The nano-dopant TiO2 was
obtained from Sigma Aldrich TiO with