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  1. AU="Ghasemi, H M"
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  1. Article ; Online: The effect of silver nanoparticles on biological and corrosion behavior of electrophoretically deposited hydroxyapatite film on Ti6Al4V.

    Balaei, Hassan / Ghasemi, H M / Aghdam, Rouhollah Mehdinavaz / Cheraghali, B / Sohi, Mahmoud Heydarzadeh

    Journal of materials science. Materials in medicine

    2024  Volume 35, Issue 1, Page(s) 18

    Abstract: Surface modification of titanium and its alloys has been seriously considered by researchers to improve their biological behaviors, in the past few decades. In present research, hydroxyapatite (HA) based composite coatings with different concentrations ... ...

    Abstract Surface modification of titanium and its alloys has been seriously considered by researchers to improve their biological behaviors, in the past few decades. In present research, hydroxyapatite (HA) based composite coatings with different concentrations of 0, 2, 4, and 6 wt% of silver (Ag) nanoparticles were electrophoretically deposited (EPD) on anodized and non-anodized Ti6Al4V, using a direct current at a voltage of 30 V for 10 min at room temperature. The specimens were then characterized by means of X-ray diffraction (XRD) analysis, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS). The cell adhesion images and cell viability results showed that HA-Ag composite coatings significantly promoted the biocompatibility of samples compared with the non-anodized and anodized Ti6Al4V. The viabilities of Mg-63 cells on HA-4%Ag coating and bi-layer coating (HA-4%Ag on anodized specimen) were approximately 91% and they were considered as the best coatings in term of biocompatibility. On the other hand, the antibacterial assessments demonstrated that HA-6%Ag coating had the best antibacterial performance compared with other samples. Furthermore, Tafel polarization curves indicated that corrosion resistance of the bi-layer coating was higher than those of the other specimens. The polarization resistance of this coating was about 7 times more than that of theTi6Al4V alloy.
    MeSH term(s) Durapatite/chemistry ; Titanium/chemistry ; Silver ; Spectroscopy, Fourier Transform Infrared ; Coated Materials, Biocompatible/chemistry ; Corrosion ; Metal Nanoparticles ; X-Ray Diffraction ; Alloys/chemistry ; Anti-Bacterial Agents
    Chemical Substances Durapatite (91D9GV0Z28) ; titanium alloy (TiAl6V4) (12743-70-3) ; Titanium (D1JT611TNE) ; Silver (3M4G523W1G) ; Coated Materials, Biocompatible ; Alloys ; Anti-Bacterial Agents
    Language English
    Publishing date 2024-03-25
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1031752-1
    ISSN 1573-4838 ; 0957-4530
    ISSN (online) 1573-4838
    ISSN 0957-4530
    DOI 10.1007/s10856-024-06784-0
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Mechanism of tribofilm formation on Ti6Al4V oxygen diffusion layer in a simulated body fluid.

    Yazdi, R / Ghasemi, H M / Abedini, M / Wang, C / Neville, A

    Journal of the mechanical behavior of biomedical materials

    2017  Volume 77, Page(s) 660–670

    Abstract: An Oxygen Diffusion Layer (ODL) was generated on the surface of Ti6Al4V alloy by thermal oxidation treatment. In vitro tests for cytotoxicity were performed in the presence of Ti6Al4V and the ODL samples with the culture of G292 Cells using MTT assay. ... ...

    Abstract An Oxygen Diffusion Layer (ODL) was generated on the surface of Ti6Al4V alloy by thermal oxidation treatment. In vitro tests for cytotoxicity were performed in the presence of Ti6Al4V and the ODL samples with the culture of G292 Cells using MTT assay. The results showed a similar cell viability in the presence of the both samples. Wear behaviour of Ti6Al4V and the ODL samples was investigated in a phosphate buffered saline solution under a normal load of 30N at a sliding velocity of 0.1m/s. The worn surface and subsurface of the samples were studied using SEM, STEM, TEM, XPS, AFM, nano-hardness and surface profilometry. A bio-tribofilm was observed on the worn surface of the ODL. TEM studies showed that the tribofilm had an amorphous structure and contained oxygen and phosphorous as confirmed by XPS and EDS analysis. AFM images also revealed that the tribofilm consisted of compacted fine debris. The formation of the tribofilm on the ODL with higher hardness and strength resulted in a decrease of about 95% in the wear rate compared with Ti6Al4V alloy.
    MeSH term(s) Alloys/chemistry ; Biocompatible Materials/chemistry ; Body Fluids ; Cell Line ; Cell Survival ; Diffusion ; Hardness ; Humans ; Materials Testing ; Microscopy, Atomic Force ; Microscopy, Electron, Scanning ; Microscopy, Electron, Transmission ; Nanostructures/chemistry ; Osteoblasts/metabolism ; Oxidation-Reduction ; Oxygen/chemistry ; Phosphorus/chemistry ; Plastics ; Stress, Mechanical ; Surface Properties ; Temperature ; Titanium/chemistry
    Chemical Substances Alloys ; Biocompatible Materials ; Plastics ; titanium alloy (TiAl6V4) (12743-70-3) ; Phosphorus (27YLU75U4W) ; Titanium (D1JT611TNE) ; Oxygen (S88TT14065)
    Language English
    Publishing date 2017-10-18
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2378381-3
    ISSN 1878-0180 ; 1751-6161
    ISSN (online) 1878-0180
    ISSN 1751-6161
    DOI 10.1016/j.jmbbm.2017.10.020
    Database MEDical Literature Analysis and Retrieval System OnLINE

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