Browsing by Publisher "Materials Research Society"

Now showing 1 - 3 of 3
  • No Thumbnail Available
    Item
    Persistent inhibition of cell growth on silver implanted glassy polymeric carbon
    (Materials Research Society, 2006) Zimmerman R.L.; Gürhan I.; Ozdal-Kurt F.; Sen B.H.; Rodrigues M.; Ila D.
    [No abstract available]
  • No Thumbnail Available
    Item
    Patterning of cell attachment to biocompatible glassy polymeric carbon by silver ion implantation
    (Materials Research Society, 2006) Zimmerman R.L.; Gurhan I.; Ila D.; Ozdal-Kurt F.; Sen B.H.; Rodrigues M.
    Although Glassy Polymeric Carbon (GPC) is ideally suited for implants in the blood stream, tissue that normally forms around the moving parts of a GPC heart valve. There is concern that the tissue lose adhesion and create the condition for embolisms downstream. We have shown that silver ion implantation or argon ion assisted surface deposition of silver inhibits cell growth on GPC, a desirable improvement of current cardiac implants. In vitro biocompatibility tests have been carried out with model cell lines to demonstrate that near surface implantation of silver in GPC can completely inhibit cell attachment on implanted areas while leaving adjacent areas unaffected. Patterned ion implantation permits precise control of tissue growth on medical applications of GPC. © 2006 Materials Research Society.
  • No Thumbnail Available
    Item
    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.