Nanoscale Surface Modification of UltraHigh Molecular Weight Polyethylene (UHMWPE) Samples with the W + C Ion Implantati
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1020-GG07-05
Nanoscale Surface Modification of UltraHigh Molecular Weight Polyethylene (UHMWPE) Samples with the W + C Ion Implantation
E. Sokullu Urkac1, A. Oztarhan1, F. Tihminlioglu2, N. Kaya1, S. Budak3, B. Chhay3, C. Muntele3, E. OKs4, A. Nikolaev4, and D. ILA3 1
Department of Bioengineering, Ege University, Bornova, 35100, Turkey
2
Department of Chemical Engineering, IYTE, Urla, 35000, Turkey
3
Center for Irradiation of Materials, Alabama A&M University, 4900 Meridian Street, PO Box 1447, Huntsville, AL, 35762 4
High Current Electronics Institute, Tomsk, 44000, Russian Federation
Abstract In this work, Ultra High Molecular Weight Poly Ethylene (UHMWPE) samples were implanted by W + C ions using Metal-Vapour Vacuum Arc (MEVVA) ion implantation system with a fluence of 10 17 ion/cm2 and extraction voltage of 30 kV. Samples were characterized with Raman Spectra, ATR-FTIR, UV-VIS-NIR Spectrum and RBS . Surface morphology of implanted and unimplanted samples were examined in nanoscale with AFM. Keywords: UHMWPE, W, C, Ion Implantation 1. Introduction Materials used for orthopedic devices should have good biocompatibility, adequate mechanical properties, and sufficient wear and corrosion resistance, and they should be manufacturable at a reasonable cost. Most of total hip joints are composed of ultra-high molecular weight polyethylene (UHMWPE) because of this materialís good biocompatibility, high resistance to wear and durability but wear debris is still the biggest problem thus, some of surface modifications are needed [1]. In this work we discuss a possible surface modification method, the ion implantation, performed by using ions of W+C to induce graphite-like surface structures in UHMWPE. The carbonñtungsten mixed-material system is probably the most widely studied system due to the formation of chemically and mechanically functionalized structures both experimentally and computationally [2]. In order to examine the effects of the implantation on UHMWPE surface, we did W+C hybrid ion implantation. Results of chemical characterization were presented and discussed before and after the treatment. 2. Material and Method Samples with medical grade GUR 1020 - Type 1 - Ultra High Molecular Weight Polyethylene (UHMWPE - , Hipokrat Co. ñCH2ñ|n monomer) with a density of 945 kg/m3 were used. Disk
samples with a diameter of 30mm and thickness of 4mm were polished down to about surface roughness of 121,94(nm) Rms. Samples were hybrid implanted in gas and vacuum discharges with W+C ions by using MEVVA ion implanter with a fluence of 1017 ion/cm2 and extraction voltage of 30 kV. 3. Characterization In order to determine the ion penetration depth and ion ranges in the UHMWPE targets, TRIM simulation sotware was used. RBS analysis has been done with 2.1 MeV He ions incident at 30∞ and detection angle at 170∞[3] . In order to determine the damage products and structural changes in UHMWPE, additional analytical techniques were employed on the implanted samples. The samples were analyzed with optical absorption photosp
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