Browsing by Author "Niedzielski, Piotr"

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    CREATION OF A 3D STRUCTURE BASED ON THE HIGH STRENGTH METALLURGICAL GRAPHENE®
    (2019-07-24) Kaczmarek, Lukasz; Kula, Piotr; Warga, Tomasz; Kolodziejczyk, Lukasz; Louda, Petr; Borůvková, Karolína; Niedzielski, Piotr; Szymanski, Witold; Voleský, Lukas; Pawlowski, Witold; Zawadzki, Piotr
    Herein, the results of a study focused on graphene in activation and cross-linking reactions with hydrazine are reported. The method provides an approach to the preparation of graphene-based materials, in this case, with a preset distance between individual layer and a relatively low ratio between the Raman G and D bands — D peak intensity/G peak intensity (ID/IG), ca. 1.81 (for unmodified High Strength Metallurgical Graphene® (HSMG® [Trade mark number: 013391669; Office for Harmonization in the Internal Market]), this ratio is 0.16). A 3D structure was created without a substrate (e.g. Si, SiO2 or polymer). This method allows for the preparation of a 3D graphene structure without the π–π interactions between individual layers.
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    Diamond-like carbon coatings for biomedical applications
    (1994-01-01) Mitura, Ewa; Mitura, StanisŁaw; Niedzielski, Piotr; Haś, Zdzislaw; Wołowiec, Remigiusz; Jakubowski, Andrzej; Szmidt, Jan; Sokołowska, Aleksandra; Louda, Petr; Marciniak, Jan; Koczy, B.
    The results of experimental studies on amorphous diamond carbon layers obtained by a new method of r.f. dense plasma chemical vapour deposition onto orthopaedic pins and screws are presented. Research on this subject which has been carried out over many years allows us to draw optimistic conclusions concerning the biomedical applications of diamond-like carbon (DLC). In particular, preliminary medical research on a new DLC-steel substrate system developed in 1992, which has just been concluded, is extremely promising. © 1994.
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    Influence of carbon coatings origin on the properties important for biomedical application
    (1996-01-01) Mitura, StanisŁaw; Niedzielski, Piotr; Jachowicz, Dariusz; Langer, Małgorzata A.; Marciniak, Jan; Stanishevsky, Andrei Vladimirovich; Tochitsky, Eduard I.; Louda, Petr; Couvrat, Patrice; Denis, Michel; Lourdin, Pierre
    The purpose of the present study was to investigate the properties of a carbon layer depending of the origin of applied methods. Quasiamorphous carbon coatings prepared by ion beam methane decomposition by RF dense plasma and vacuum pulsed arc deposition were applied to stainless steel implants used in surgery. The studies of carbon films as coatings for implants in surgery were aimed on the investigations of biological resistance of implants, histopathological investigations using laboratory animals, tests of corrosion resistance, measurements of mechanical properties and a breakdown test in Tyrod solution. The comparison of the properties of the coating produced by these methods shows very good biotolerance and biocompatibility of all of the coatings. They are not corroded in physiological fluids. From the other side they have different properties, especially electrical and optical, and are not influenced on medical applications. The obtained results prove that the implants coated by all the methods mentioned are a very good material for medical use.