3468

3274

كارشناسي ارشد

شناسايي و انتخاب مواد

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد

1385

ده، 141، [II]ص.: مصور، جدول، نمودار

ص. ع. به فارسي و انگليسي

محمدحسين فتحي

وجيه السادات مرتضوي

22/2/86

احمد منشي، امان الله امين زاده

1396/02/30

كتابنامه

مواد

مهندسي مواد

ID3274

به فارسي و انگليسي: قابل رويت در نسخه ديجيتال

AbstractBone and dental are nanocomposites that have been made of hydroxyapatite nanoparticlesin the polymeric collagen matrix Over the past two decades many researches have focusedon preparing synthetic HA Low temperature formation and fusion of the apatite crystalshas been the main contributions of the sol gel process in comparison to conventionalmethods The high reactivity of the sol gel nanopowder allows a reduction of theprocessing temperature and of any degradation phenomena occurring during sintering HAcoatings have been used for improving the bioactivity properties of implants Sol geltechnique can use for producing nanostructured HA coatings on the difference titaniumimplants In this study HA nanopowders and nanostructured coatings were prepared by asol gel method using phosphoric pentoxide P2O5 and calcium nitrate tetrahydrate Ca NO3 2 4H2O X ray diffraction XRD Thermal Gravity Analysis TGA FourierTransform Infra Red FTIR scanning electron microscopy SEM and transmissionelectron microscopy TEM were used to characterization and evaluation of the phasecomposition thermal behavior functional groups morphology and particle size ofproducts In vitro studies were performed by using SBF solution pH meter and AtomicAdsorption Spectroscopy AAS were used to evaluating the SBF solutions during in vitrotests It was found that at sintering temperatures ranging from 600 to 700 C the dominantphase of the powder was HA with the small amounts of calcium oxide and tricalciumphosphate TCP 20 35 nm HA powders were obtained using this technique Increasingthe sintering time had no significant effect on crystalline degree but increasing thesintering temperature increased the crystalline degree of HA powders Fourier transforminfrared FTIR spectroscopy showed that synthesized powder has any characteristic HAFTIR peaks and was carbonate substituted similar to the biological apatites In vitroexaminations in SBF showed that Ca2 dissolution rate of nanocrystalline hydroxyapatitewas higher than conventional HA and similar with that for biological apatite of bone owingto its nanostructure and composition HA coating was obtained at sintering temperature of600 C 35 40 nm HA powders were obtained using this technique The optimum agingtime for producing single phase sol gel HA nanopowder and coatings obtained 24 hours The used technique has an advantage in compare with the other sol gel methods becauseof no requiring pH value control and using catalyst

محمدحسين فتحي

وجيه السادات مرتضوي

احمد منشي، امان الله امين زاده