Browsing by Author "Budak S."

Now showing 1 - 4 of 4
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    Cell adhesion study of the titanium alloys exposed to glow discharge
    (2007) Abidzina V.; Deliloglu-Gürhan I.; Özdal-Kurt F.; Sen B.H.; Tereshko I.; Elkin I.; Budak S.; Muntele C.; Ila D.
    Titanium for biomedical application stems mainly from its advantageous bulk mechanical properties in combination with a high degree of biocompatibility that is largely attributable to their surface properties. This work is focused on the investigation of surface properties of treated titanium and cell adhesion to titanium treated in glow-discharge plasma. Pure titanium samples (grade 4) were exposed to low-energy ion irradiation in a specially constructed plasma generator, where materials were irradiated by ions of residual gases in vacuum. The ion energy was 1-10 keV. The irradiation dose was maintained at 1017 ions cm-2. The irradiation time varied from 5 to 60 min. Rutherford backscattering spectrometry (RBS) was used for surface studies. RBS showed the presence of iron on the titanium surface that occurred from the cathode of plasma generator. In vitro biocompatibility test have been carried out with model cell lines (L929 mouse fibroblasts) to demonstrate that low-energy ion irradiation can favorably influence the surface of titanium for biomedical application. Scanning electron microscopy (SEM) was the main tool to demonstrate the cell attachment properties. © 2007 Elsevier B.V. All rights reserved.
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    Polymeric thermal analysis of C + H and C + H + Ar ion implanted UHMWPE samples
    (2007) Kaya N.; Oztarhan A.M.; Urkac E.S.; Ila D.; Budak S.; Oks E.; Nikolaev A.; Ezdesir A.; Tihminlioglu F.; Tek Z.; Cetiner S.; Muntele C.
    Chemical surface characterization of C + H hybrid ion implanted UHMWPE samples were carried out using DSC (differential scanning calorimeter) and TGA (thermal gravimetric analysis) techniques. Samples were implanted with a fluence of 1017 ion/cm2 and an extraction voltage of 30 kV. The study of TGA and DSC curves showed that: (1) Polymeric decomposition temperature increased, (2) Tm, ΔCp and ΔHm values changed while ΔCp and ΔHm increased. Tg value could not be measured, because of some experimental limitations. However, the increase in ΔHm values showed that Tg values increased, (3) the branch density which indicated the increase in number of cross-link (Mc) decreased in ion implanted samples and (4) increase in ΔHm values indicated increase in crystallinity of implanted surface of UHMWPE samples.
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    Thermal characterization of Ag and Ag + N ion implanted ultra-high molecular weight polyethylene (UHMWPE)
    (2007) Sokullu Urkac E.; Oztarhan A.; Tihminlioglu F.; Kaya N.; Ila D.; Muntele C.; Budak S.; Oks E.; Nikolaev A.; Ezdesir A.; Tek Z.
    Most of total hip joints are composed of ultra-high molecular weight polyethylene (UHMWPE ). However, as ultra-high molecular weight polyethylene is too stable in a body, wear debris may accumulate and cause biological response such as bone absorption and loosening of prosthesis. In this study, ultra-high molecular weight polyethylene samples were Ag and Ag + N hybrid ion implanted by using MEVVA ion implantation technique to improve its surface properties. Samples were implanted with a fluence of 1017 ion/cm2 and extraction voltage of 30 kV. Implanted and unimplanted samples were investigated by thermo-gravimetry analysis (TGA), differential scanning calorimetry (DSC), X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), optical microscopy (OM) and contact Angle measurement. Thermal characterization results showed that the ion bombardment induced an increase in the % crystallinity, onset and termination degradation temperatures of UHMWPE. © 2007 Elsevier B.V. All rights reserved.
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    Modification of surface morphology of UHMWPE for biomedical implants
    (Materials Research Society, 2007) Oztarhan A.; Urkac E.S.; Kaya N.; Yenigul M.; Tihminlioglu F.; Ezdesir A.; Zimmerman R.; Budak S.; Muntele C.; Chhay B.; Ila D.; Oks E.; Nikolaev A.; Tek Z.; Eltem R.
    Ultra High Molecular Weight Polyethylene (UHMWPE) samples were implanted with metal and metal-gas hybrid ions (Ag, Ag+N, C+H, C+H+Ar, Ti+O) by using improved MEVVA Ion implantation technique [1,2]. An extraction voltage of 30 kV and influence of 1017 ions/cm2 were attempted in this experiment, to change their surface morphologies in order to understand the effect of ion implantation on the surface properties of UHMWPEs. Characterizations of the implanted samples with RBS , ATR - FTIR, spectra were compared with the un-implanted ones . Implanted and unimplanted samples were also thermally characterized by TGA and DSC. It was generally observed that C-H bond concentration seemed to be decreasing with ion implantation and the results indicated that the chain structure of UHMWPE were changed and crosslink density and polymer crystallinity were increased compared to unimplanted ones resulting in increased hardness. It was also observed that nano size cracks (approx.10nm) were significantly disappeared after Ag implantation, which also has an improved antibacterial effect. Contact angle measurements showed that wettability of samples increased with ion implantation. Results showed that metal and metal+gas hybrid ion implantation could be an effective way to improve the surface properties of UHMWPE to be used in hip and knee prosthesis. © 2007 Materials Research Society.