Browsing NTNU Open by Author "Rokosz, Krzysztof"
Now showing items 1-20 of 30
-
Antimicrobial Properties of Samarium Doped Hydroxyapatite Suspensions and Coatings
Iconaru, Simona Liliana; Groza, A; Gaiaschi, Sofia; Rokosz, Krzysztof; Raaen, Steinar; Ciobanu, Steluta Carmen; Chapon, Patrick; Predoi, Daniela (Peer reviewed; Journal article, 2020)Post-implant infections are a major health problem, and it is well-known that treating them with conventional drugs is accompanied by many disadvantages. The development of new biomaterials with enhanced antimicrobial ... -
Biocomposite Coatings Doped with Magnesium and Zinc Ions in Chitosan Matrix for Antimicrobial Applications
Predoi, Daniela; Ciobanu, Carmen Steluta; Iconaru, Simona Liliana; Raaen, Steinar; Rokosz, Krzysztof (Peer reviewed; Journal article, 2023)Hydroxyapatite doped with magnesium and zinc in chitosan matrix biocomposites have great potential for applications in space technology, aerospace, as well as in the biomedical field, as a result of coatings with multifunctional ... -
Biological and Physico-Chemical Properties of Composite Layers Based on Magnesium-Doped Hydroxyapatite in Chitosan Matrix
Iconaru, Simona Liliana; Ciobanu, Carmen Steluta; Predoi, Gabriel; Rokosz, Krzysztof; Chifiriuc, Mariana Carmen; Bleotu, Coralia; Stanciu, George; Hristu, Radu; Raaen, Steinar; Raita, Stefania; Ghegoiu, Liliana; Badea, Monica Luminita; Predoi, Daniela (Peer reviewed; Journal article, 2022)In the present study, we report the development and characterization of composite layers (by spin coating) based on magnesium-doped hydroxyapatite in a chitosan matrix, (Ca10−xMgx(PO4)6(OH)2; xMg = 0, 0.08 and 0.3; HApCh, ... -
Characterisation of Calcium- and Phosphorus-Enriched Porous Coatings on CP Titanium Grade 2 Fabricated by Plasma Electrolytic Oxidation
Rokosz, Krzysztof; Hryniewicz, Tadeusz; Gaiaschi, Sofia; Chapon, Patrick; Raaen, Steinar; Pietrzak, Kornel; Malorny, Winfried (Journal article; Peer reviewed, 2017)In the paper, Scanning Electron Microscopy (SEM), Energy-dispersive X-ray Spectroscopy (EDS), X-ray Photoelectron Spectroscopy (XPS), and Glow Discharge Optical Emission Spectroscopy (GDOES) analyses of calcium- and ... -
Characterisation of porous coatings formed on titanium under AC plasma electrolytic oxidation
Rokosz, Krzysztof; Hryniewicz, Tadeusz; Gaiaschi, Sofia; Chapon, Patrick; Raaen, Steinar; Dudek, Lukasz; Pietrzak, Kornel; malorny, winfried; Ciuperca, Radion (Journal article; Peer reviewed, 2018)The Plasma Electrolytic Oxidation (PEO) process may be used to fabricate porous coatings on titanium. The ranges of voltages used in case of these plasma treatments are different. It has been found that for DC PEO processing ... -
Characterisation of porous coatings formed on titanium under DC plasma electrolytic oxidation
Rokosz, Krzysztof; Hryniewicz, Tadeusz; Gaiaschi, Sofia; Chapon, Patrick; Raaen, Steinar; Dudek, Lukasz; Pietrzak, Kornel; malorny, winfried; Ciuperca, Radion (Journal article; Peer reviewed, 2018)Porous coatings on titanium may be obtained by AC or DC Plasma Electrolytic Oxidation (PEO) process. One has to point out that depending on the plasma treatment the ranges of voltages used are different. It has been found ... -
Characterization of Porous Phosphate Coatings Enriched with Calcium, Magnesium, Zinc and Copper Created on CP Titanium Grade 2 by Plasma Electrolytic Oxidation
Rokosz, Krzysztof; Hryniewicz, Tadeusz; Kacalak, Wojciech; Tandecka, Katarzyna; Raaen, Steinar; Gaiaschi, Sofia; Chapon, Patrick; malorny, winfried; Matysek, Dalibor; Dudek, Lukasz; Pietrzak, Kornel (Journal article; Peer reviewed, 2018)In the paper, the effect of voltage increase (from 500 VDC up to 650 VDC) on the structure and chemical composition of the porous coating on titanium made by Plasma Electrolytic Oxidation is presented. Phosphates-based ... -
Characterization of Porous Phosphate Coatings Enriched with Magnesium or Zinc on CP Titanium Grade 2 under DC Plasma Electrolytic Oxidation
Rokosz, Krzysztof; Hryniewicz, Tadeusz; Gaiaschi, Sofia; Chapon, Patrick; Raaen, Steinar; Pietrzak, Kornel; malorny, winfried; Fernandes, Joao Salvador (Journal article; Peer reviewed, 2018)The aim of the paper is to study and determine the effect of voltage increasing from 500 up to 650 VDC on chemical and electrochemical properties of the obtained porous coatings with plasma electrolytic oxidation (PEO) ... -
Cr/Fe ratio by XPS spectra of magnetoelectropolished AISI 316L SS fitted by Gaussian-Lorentzian shape lines
Rokosz, Krzysztof; Hryniewicz, Tadeusz; Raaen, Steinar (Journal article; Peer reviewed, 2014)In the paper, the analyses of Fe2p3/2 and chromium Cr2p3/2 XPS spectra with fitting by symmetrical and asymmetrical line shapes, are presented. The calculations are performed on AISI 316L SS biomaterial after magnetoelec ... -
Development of Cerium‐Doped Hydroxyapatite Coatings with Antimicrobial Properties for Biomedical Applications
Predoi, Daniela; Iconaru, Simona Liliana; Predoi, Mihai Valentin; Groza, Andreea; Gaiaschi, Sofia; Rokosz, Krzysztof; Raaen, Steinar; Negrila, Catalin Constantin; Prodan, Alina-Mihaela; Costescu, Adrian; Badea, Monica Luminita; Chapon, Patrick (Peer reviewed; Journal article, 2020)Antibacterial cerium-doped hydroxyapatite (Ce-HAp) layers have been researched sparingly in recent years. The Ce-HAp powder, Ca10−xCex(PO4)6(OH)2 with xCe = 0.05, was obtained by an adapted chemical co-precipitation method ... -
Development of Porous Coatings Enriched with Magnesium and Zinc Obtained by DC Plasma Electrolytic Oxidation
Rokosz, Krzysztof; Hryniewicz, Tadeusz; Gaiaschi, Sofia; Chapon, Patrick; Raaen, Steinar; malorny, winfried; Matysek, Dalibor; Pietrzak, Kornel (Journal article; Peer reviewed, 2018)Coatings with developed surface stereometry, being based on a porous system, may be obtained by plasma electrolytic oxidation, PEO (micro arc oxidation, MAO). In this paper, we present novel porous coatings, which may be ... -
Effect of nitrogen pressure and substrate bias voltage on the properties of Al–Cr–B–N coatings deposited using cathodic arc evaporation
Warcholinski, B; Gilewicz, A; Myslinski, P; Dobruchowska, E; Murzynski, D; Kochmanski, P; Rokosz, Krzysztof; Raaen, Steinar (Peer reviewed; Journal article, 2021)Cathodic arc evaporation deposition method was applied to forming Al–Cr–B–N coatings. The effect of nitrogen pressure (pN2) and substrate bias voltage (UB) on the properties of the coatings synthesized using Al50Cr30Br20 ... -
Electrochemical modification of the Ti-15Mo alloy surface in solutions containing ZnO and Zn3(PO4)2 particles
Lesniak-Ziolkowska, Katarzyna; Kazek-Kesik, Alicja; Rokosz, Krzysztof; Raaen, Steinar; Stolarczyk, Agnieszka; Krok-Borkowicz, Malgorzata; Pamula, Elzbieta; Golda-Cepa, Monika; Brzychczy-Wloch, Monika; Simka, Wojciech (Peer reviewed; Journal article, 2020)This paper reports on the plasma electrolytic oxidation (PEO) of titanium alloy Ti-15Mo in baths containing zinc to obtain biomaterials with bacteriostatic and antibacterial properties. The Ti-15Mo surface was oxidised in ... -
Fabrication and Characterisation of Porous Coatings Enriched with Copper on CP Titanium Grade 2 under Plasma Electrolytic Oxidation
Rokosz, Krzysztof; Hryniewicz, Tadeusz; Gaiaschi, Sofia; Chapon, Patrick; Raaen, Steinar; Dudek, Lukasz; malorny, winfried (Journal article; Peer reviewed, 2019)In the present paper, coatings obtained on CP Titanium Grade 2 samples by Plasma Electrolytic Oxidation (PEO) in electrolyte containing concentrated phosphoric acid H3PO4 with copper nitrate Cu(NO3)2∙3H2O, are studied with ... -
High-current-density electropolishing (HDEP) of AISI 316L (EN 1.4404) stainless steel
Rokosz, Krzysztof; Hryniewicz, Tadeusz; Rzadkiewicz, Slawomir; Raaen, Steinar (Journal article; Peer reviewed, 2015)The paper presents new XPS results of surface layers formed after electrochemical polishing of AISI 316L stainless steel at high current density (HDEP) of 1000 A/dm2 (EP1000) versus a standard electropolishing (EP50) process ... -
Impact of Gamma Irradiation on the Properties of Magnesium-Doped Hydroxyapatite in Chitosan Matrix
Predoi, Daniela; Ciobanu, Carmen Steluta; Iconaru, Simona Liliana; Predoi, Silviu Adrian Predoi; Chifiriuc, Mariana Carmen; Raaen, Steinar; Badea, Monica Luminita; Rokosz, Krzysztof (Peer reviewed; Journal article, 2022)This is the first report regarding the effect of gamma irradiation on chitosan-coated magnesium-doped hydroxyapatite (xMg = 0.1; 10 MgHApCh) layers prepared by the spin-coating process. The stability of the resulting 10 ... -
Influence of Elemental Carbon (EC) Coating Covering nc-(Ti,Mo)C Particles on the Microstructure and Properties of Titanium Matrix Composites Prepared by Reactive Spark Plasma Sintering
Biedunkiewicz, Anna; Figiel, Pawel; Garbiec, Dariusz; Obrosov, Aleksei; Pawlyta, Miroslawa; Biedunkiewicz, Witold; Pruss, Przemyslaw; Rokosz, Krzysztof; Wrobel, Rafal; Raaen, Steinar; Weiss, Sabine; Bokov, Dmitry (Peer reviewed; Journal article, 2021)This paper describes the microstructure and properties of titanium-based composites obtained as a result of a reactive spark plasma sintering of a mixture of titanium and nanostructured (Ti,Mo)C-type carbide in a carbon ... -
The Influence of Nanometals, Dispersed in the Electrophoretic Nanohydroxyapatite Coatings on the Ti13Zr13Nb Alloy, on Their Morphology and Mechanical Properties
Bartmanski, Michal; Pawlowski, Lukasz; Mielewczyk-Gryn, Aleksandra; Strugala, Gabriel; Rokosz, Krzysztof; Gaiaschi, Sofia; Chapon, Patrick; Raaen, Steinar; Zielinski, Andrzej (Peer reviewed; Journal article, 2021)In this work, nanohydroxyapatite coatings with nanosilver and nanocopper have been fabricated and studied. The presented results concern coatings with a chemical composition that has never been proposed before. The present ... -
Investigation of Spin Coating Cerium-Doped Hydroxyapatite Thin Films with Antifungal Properties
Iconaru, Simona Liliana; Predoi, Mihai Valentin; Chapon, Patrick; Gaiaschi, Sofia; Rokosz, Krzysztof; Raaen, Steinar; Motelica-Heino, Mikael; Predoi, Daniela (Peer reviewed; Journal article, 2021)In this study, the cerium-doped hydroxyapatite (Ca10−xCex(PO4)6(OH)2 with xCe = 0.1, 10Ce-HAp) coatings obtained by the spin coating method were presented for the first time. The stability of the 10Ce-HAp suspension particles ... -
Metal Ions Supported Porous Coatings by Using AC Plasma Electrolytic Oxidation Processing
Rokosz, Krzysztof; Hryniewicz, Tadeusz; Raaen, Steinar; Gaiaschi, Sofia; Chapon, Patrick; Matysek, Dalibor; Pietrzak, Kornel; Szymanska, Monika; Dudek, Łukasz (Peer reviewed; Journal article, 2020)Coatings enriched with zinc and copper as well as calcium or magnesium, fabricated on titanium substrate by Plasma Electrolytic Oxidation (PEO) under AC conditions (two cathodic voltages, i.e., −35 or −135 V, and anodic ...