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      저자 : Kharaziha, Mahshid (검색결과 2 건)
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        Role of Heat Treatment on the Fabrication and Electrochemical Property of Ordered TiO2 Nanotubular Layer on the As‑Cast NiTi

        Fatemeh Mohammadi,Mahshid Kharaziha,Ali Ashrafi 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.3

        We investigated the effect of various heat treatment processes on the formation and electrochemical properties of orderedTiO2nanotubes (TNTs) on NiTi. In this respect, after solution treatment of as-cast NiTi samples at 900 °C for 1 h,four different heat-treated groups were examined consisting of furnace-cooled sample, water-quenched sample, waterquenched/300 °C-aged treated (300T-NiTi) and water-quenched/500 °C-aged treated (500T-NiTi) samples. Consequently,heat-treated samples were anodized in ethylene glycol solution containing NH4F. Results showed that the microstructure,chemical composition and grain size of the NiTi samples depended on the heat treatment process. Water-quenching and subsequentaging process provided fine precipitations distributed in the grain boundaries and reduced grain size. Furthermore,it was found that TNTs with various distributions and microstructures could be developed depending on the heat-treatmentprocess of NiTi samples as well as anodization voltage and time. Noticeably, anodization of 500T-NiTi samples resulted information of well-distributed TNTs with diameters of 30 ± 5 nm. Moreover, heat-treatment process as well as TNT formationresulted in significantly enhanced corrosion resistance of as-cast NiTi substrate and reduced Ni release, depending onthe treatment process. Regarding potential applications, anodization of water-quenched and 500 °C aged treated NiTi at50 V for 10 min could provide nano-scaled biofunctional coating to promote the biological applications of NiTi implants.

      • Ion-beam irradiation of DLC-based nanocomposite: Creation of a highly biocompatible surface

        Penkov, Oleksiy V.,Kheradmandfard, Mehdi,Khadem, Mahdi,Kharaziha, Mahshid,Mirzaamiri, Rouhollah,Seo, Kuk-Jin,Kim, Dae-Eun Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.469 No.-

        <P><B>Abstract</B></P> <P>Ion-beam irradiation of diamond-like carbon (DLC) by He ions was studied. Molecular dynamics simulation was performed to understand the effects of irradiation on the nano-topography and chemical state of the coatings and determine the optimal irradiation conditions. Then, the experiment was conducted to validate the results of the simulation and correlate surface modifications to biomedical properties. It was demonstrated that the irradiation led to the formation of a low-density and low-sp<SUP>3</SUP> content surface layer. The structural and chemical properties of the final surface were nearly independent of the initial sp<SUP>3</SUP> content and irradiation energy. The biocompatibility of DLC-based nanocomposite coatings was significantly improved by ion-beam irradiation. Nanocomposite coatings were irradiated by 1 keV He ions. Irradiation with a dose of 4.2 × 10<SUP>15</SUP> ion/cm<SUP>2</SUP> increased the adhesion of MG63 cells dramatically from 10 to ∼100%.</P> <P><B>Highlights</B></P> <P> <UL> <LI> MD models of DLC with various sp<SUP>3</SUP> content were developed. </LI> <LI> MD simulation of ion-beam irradiation of DLC was performed. </LI> <LI> DCL-based nanocomposites were irradiated by He ion beam. </LI> <LI> Effect of the ion-beam irradiation n cell adhesion was assessed. </LI> <LI> Correlations between MD simulation and experiment were established. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

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