Browsing by Author "Nečas, David"

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    Frictional Behaviour and Surface Topography Evolution of DLC-Coated Biomedical Alloys
    (2025) Nečas, David; Gelnar, Adam; Rothammer, Benedict; Marian, Max; Ranuša, Matúš; Wartzack, Sandro; Vrbka, Martin; Křupka, Ivan; Hartl, Martin
    Advanced engineering coatings offer a promising solution to enhance the longevity and performance of medical biomaterials in orthopaedic implants. This study hypothesises that diamond-like carbon (DLC) coatings exhibit distinct frictional performance based on substrate and counterface material. Three different DLC coatings were tested using a pin-on-plate test in four material combinations. Virgin and DLC-coated CoCrMo and Ti6Al4V pins were tested under sliding against UHMWPE and glass plates with simulated body fluid lubrication. Results revealed that coating composition significantly impacts frictional performance, with silicon- and oxygen-doped coatings showing great potential to minimise friction. Surprisingly, reducing contact pressure had either a neutral or somewhat negative effect. Future investigations will focus on long-term testing and lubrication analyses of these material combinations.
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    Roadmap for 2D materials in biotribological/biomedical applications – A review
    (2022) Marian, Max; Berman, Diana; Nečas, David; Emami, Nazanin; Ruggiero, Alessandro; Rosenkranz, Andreas
    The human body involves a large number of systems subjected to contact stresses and thus experiencing wear and degradation. The limited efficacy of existing solutions constantly puts a significant financial burden on the healthcare system, more importantly, patients are suffering due to the complications following a partial or total system failure. More effective strategies are highly dependent on the availability of advanced functional materials demonstrating excellent tribological response and good biocompatibility. In this article, we review the recent progress in implementing two-dimensional (2D) materials into bio-applications involving tribological contacts. We further summarize the current challenges for future progress in the field.