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Paul Dinca
Faculty of Physics, University of Bucharest, 405 Atomistilor Street, 077125 Magurele, Romania

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Journal article
Published: 28 March 2020 in Coatings
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Autonomous smart natural ventilation systems (SVS) attached to the glass façade of living quarters and office buildings can help reducing the carbon footprint of city buildings in the future, especially during warm seasons and can represent an alternative to the conventional mechanical ventilation systems. The work performed in this manuscript focuses on the investigation of bacteria trapping and killing efficiency of stainless steel grids coated with a mixed layer of Cu-Ag. These grids are to be employed as decontamination filters for a smart natural ventilation prototype that we are currently building in our laboratory. The tested grids were coated with a mixed Cu-Ag layer using thermionic vacuum arc plasma processing technology. The fixed deposition geometry allowed the variation of Cu and Ag atomic concentration in coated layers as a function of substrate position in relation to plasma sources. The test conducted with air contaminated with a pathogen strain of staphylococcus aureus indicated that the filtering efficiency is influenced by two parameters: the pore size dimension and the coating layer composition. The results show that the highest filtering efficiency of 100% was obtained for fine pore (0.5 × 0.5 mm) grids coated with a mixed metallic layer composed of 65 at% Cu and 35 at% Ag. The second test performed only on reference grids and Cu-Ag (65–35 at%) under working conditions, confirm a similar filtering efficiency for the relevant microbiological markers. This particular sample was investigated from morphological, structural, and compositional point of view. The results show that the layer has a high surface roughness with good wear resistance and adhesion to the substrate. The depth profiles presented a uniform composition of Cu and Ag in the layer with small variations caused by changes in deposition rates during the coating process. Identification of the two metallic phases of the Cu and Ag in the layers evidences their crystalline nature. The calculated grain size of the nanocrystalline was in the range 14–21 nm.

ACS Style

P. Dinca; B. Butoi; M. Lungu; C. Porosnicu; I. Jepu; C. Staicu; C.P. Lungu; A. Niculescu; I. Burducea; O. Trusca; M. Diaconu; I. Cretescu; G. Soreanu. Antibacterial Efficiency of Stainless-Steel Grids Coated with Cu-Ag by Thermionic Vacuum Arc Method. Coatings 2020, 10, 322 .

AMA Style

P. Dinca, B. Butoi, M. Lungu, C. Porosnicu, I. Jepu, C. Staicu, C.P. Lungu, A. Niculescu, I. Burducea, O. Trusca, M. Diaconu, I. Cretescu, G. Soreanu. Antibacterial Efficiency of Stainless-Steel Grids Coated with Cu-Ag by Thermionic Vacuum Arc Method. Coatings. 2020; 10 (4):322.

Chicago/Turabian Style

P. Dinca; B. Butoi; M. Lungu; C. Porosnicu; I. Jepu; C. Staicu; C.P. Lungu; A. Niculescu; I. Burducea; O. Trusca; M. Diaconu; I. Cretescu; G. Soreanu. 2020. "Antibacterial Efficiency of Stainless-Steel Grids Coated with Cu-Ag by Thermionic Vacuum Arc Method." Coatings 10, no. 4: 322.

Journal article
Published: 06 December 2019 in Materials
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Reduced activation ferritic and martensitic steel like EUROFER (9Cr-1W) are considered as potential structural materials for the first wall of the future next-generation DEMOnstration Power Station (DEMO) fusion reactor and as a reference material for the International Thermonuclear Experimental Reactor (ITER) test blanket module. The primary motivation of this work is to study the re-deposition of the main constituent materials of EUROFER, namely tungsten (W), iron (Fe), and chromium (Cr), in a DEMO type reactor by producing and analyzing complex WxCryFe1−x−y layers. The composite layers were produced in laboratory using the thermionic vacuum arc (TVA) method, and the morphology, crystalline structure, elemental composition, and mechanical properties were studied using scanning electron microscopy (SEM), X-ray diffraction (XRD), micro-X-ray fluorescence (micro-XRF), and glow discharge optical emission spectrometry (GDOES), as well as nanoindentation and tribology measurements. The results show that the layer morphology is textured and is highly dependent on sample positioning during the deposition process. The formation of polycrystalline WxCryFe1−x−y was observed for all samples with the exception of the sample positioned closer to Fe anode during deposition. The crystalline grain size dimension varied between 10 and 20 nm. The composition and thickness of the layers were strongly influenced by the in-situ coating position, and the elemental depth profiles show a non-uniform distribution of Fe and Cr in the layers. The highest hardness was measured for the sample positioned near the Cr anode, 6.84 GPa, and the lowest was 4.84 GPa, measured for the sample positioned near the W anode. The tribology measurements showed an abrasive sliding wear behavior for most of the samples with a reduction of the friction coefficient with the increase of the normal load.

ACS Style

Mihail Lungu; Ioana Porosnicu; Paul Dinca; Alin Velea; Flaviu Baiasu; Bogdan Butoi; Oana Gloria Pompilian; Cornel Staicu; Parau Anca Constantina; Corneliu Porosnicu; Cristian Lungu; Ion Tiseanu. Structural, Compositional, and Mechanical Characterization of WxCryFe1−x−y Layers Relevant to Nuclear Fusion, Obtained with TVA Technology. Materials 2019, 12, 4072 .

AMA Style

Mihail Lungu, Ioana Porosnicu, Paul Dinca, Alin Velea, Flaviu Baiasu, Bogdan Butoi, Oana Gloria Pompilian, Cornel Staicu, Parau Anca Constantina, Corneliu Porosnicu, Cristian Lungu, Ion Tiseanu. Structural, Compositional, and Mechanical Characterization of WxCryFe1−x−y Layers Relevant to Nuclear Fusion, Obtained with TVA Technology. Materials. 2019; 12 (24):4072.

Chicago/Turabian Style

Mihail Lungu; Ioana Porosnicu; Paul Dinca; Alin Velea; Flaviu Baiasu; Bogdan Butoi; Oana Gloria Pompilian; Cornel Staicu; Parau Anca Constantina; Corneliu Porosnicu; Cristian Lungu; Ion Tiseanu. 2019. "Structural, Compositional, and Mechanical Characterization of WxCryFe1−x−y Layers Relevant to Nuclear Fusion, Obtained with TVA Technology." Materials 12, no. 24: 4072.

Journal article
Published: 20 March 2018 in Coatings
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A series of the multicomponent thin films (binary: Ti-C; Ti-Ag and ternary: Ti-C-Ag; Ti-C-Al) were fabricated by Thermionic Vacuum Arc (TVA) technology in order to study the wear resistance and the anticorrosion properties. The effects of Ti amount on the microstructure, tribological and morphological properties were subsequently investigated. TVA is an original deposition method using a combination of anodic arc and electron gun systems for the growth of films. The samples were characterized using scanning electron microscope (SEM) and a transmission electron microscope (TEM) accompanied by selected area electron diffraction (SAED). Tribological properties were studied by a ball-on-disc tribometer in the dry regime and the wettability was assessed by measuring the contact angle with the See System apparatus. Wear Rate results indicate an improved sliding wear behavior for Ti-C-Ag: 1.31 × 10−7 mm3/N m (F = 2 N) compared to Ti-C-Al coating wear rate: 4.24 × 10−7 mm3/N m. On the other hand, by increasing the normal load to 3 N an increase to the wear rate was observed for Ti-C-Ag: 2.58 × 10−5 mm3 compared to 2.33 × 10−6 mm3 for Ti-C-Al coating.

ACS Style

Aurelia Mandes; Rodica Vladoiu; Gabriel Prodan; Virginia Dinca; Corneliu Porosnicu; Paul Dinca. The Properties of Binary and Ternary Ti Based Coatings Produced by Thermionic Vacuum Arc (TVA) Technology. Coatings 2018, 8, 114 .

AMA Style

Aurelia Mandes, Rodica Vladoiu, Gabriel Prodan, Virginia Dinca, Corneliu Porosnicu, Paul Dinca. The Properties of Binary and Ternary Ti Based Coatings Produced by Thermionic Vacuum Arc (TVA) Technology. Coatings. 2018; 8 (3):114.

Chicago/Turabian Style

Aurelia Mandes; Rodica Vladoiu; Gabriel Prodan; Virginia Dinca; Corneliu Porosnicu; Paul Dinca. 2018. "The Properties of Binary and Ternary Ti Based Coatings Produced by Thermionic Vacuum Arc (TVA) Technology." Coatings 8, no. 3: 114.