scholarly journals Creation and research of antistatic carbon coatings on fabric 05С8-КВ, modified by metal clusters

2020 ◽  
pp. 113-117
Author(s):  
A. G. Anisovich ◽  
I. P. Akula ◽  
A. P. Laskovnev ◽  
M. I. Markevich ◽  
N. M. Chekan
Keyword(s):  
Spectral Line ◽  
Carbon Coating ◽  
Metal Clusters ◽  
Local Concentration ◽  
High Concentration ◽  
Epr Spectrum ◽  
Carbon Coatings ◽  
G Factor ◽  
12X18h10t Steel ◽  
Coated Fabric

Application modes have been developed and carbon coatings modified with metal clusters on 05S8-KV fabric (manufacturer OJSC Mogotex) were created. The surface morphology of this coated fabric was investigated. It was shown that during the deposition of coatings from 12X18H10T steel targets a droplet phase is present on the coatings (the maximum droplet size reaches 3.5 μm). The paramagnetic absorption of the system carbon coating – clusters from the 12X18H10T steel target is investigated. It was found that the EPR spectrum contains a spectral line 94.4 mt wide, which indicates a high concentration of magnetic resonance centers, the effective value of the g-factor is 2.26 ± 0.01. In addition, a narrow spectral line with an effective g-factor of 2.04 ± 0.01 is recorded in the spectrum, the linewidth is 4.3 mt, which is associated with a high local concentration of unpaired electrons in carbon clusters with a weak nonresonant absorption at UHF (ultra-high frequrncy). The result of measuring the specific surface resistance on fabrics with this coating (side 1 / side 2) is 2.3.109 and 4.8.109 ohms, respectively, which is slightly lower than for a pure carbon coating.

scholarly journals Surface morphology, magnetic resonance and antistatic properties of fabric with carbon coating, modified by metal clusters

2020 ◽  
pp. 79-83
Author(s):  
A. G. Anisovich ◽  
I. P. Akula ◽  
A. P. Laskovnev ◽  
M. I. Markevich ◽  
N. M. Chekan
Keyword(s):  
Magnetic Resonance ◽  
Spectral Line ◽  
Carbon Coating ◽  
Metal Clusters ◽  
Resonant Absorption ◽  
Epr Spectrum ◽  
G Factor ◽  
Cathodic Arc Deposition ◽  
Calibration Sample ◽  
Cathodic Arc

The morphology of the surface, the magnetic resonance and antistatic properties of the 07C11-KV blended fabric manufactured by Mogotex LLC with a carbon coating doped with metal clusters are studied.The coating was applied by pulsed cathodic-arc deposition in vacuum of 3.5 · 10–3 Pa. It is established that during the coatinga droplet phase is formed. The size of the drops reaches 20 – 25 microns. The result of measuring the surface resistivity on fabric 1 side / 2 side is 3.2 · 107 and 1.9 · 107 Om, respectively. On the EPR spectrum are recorded two lines. The first line is a broad spectral line with an effective g-factor of 2.27 ± 0.01 and a width of 94.4 mT. The second line is narrow spectral line with an effective g-factor of 2.04 ± 0.01 and a width of 4.3 mT. This is corresponds to carbon coating clusters.From the ratio of the signal intensities of the filled resonator and the calibration sample, it follows that the non-resonant absorption of the microwave electromagnetic field in the system is slightly attenuated.

scholarly journals Adhesion of acorn barnacles on surface-active borate glasses

2019 ◽  
Vol 374 (1784) ◽  
pp. 20190203 ◽  
Author(s):  
Kenan P. Fears ◽  
Andrew Barnikel ◽  
Ann Wassick ◽  
Heonjune Ryou ◽  
Janna N. Schultzhaus ◽  
...  
Keyword(s):  
Field Tests ◽  
Borate Glasses ◽  
Local Concentration ◽  
High Concentration ◽  
Marine Biofouling ◽  
Microbial Biofilms ◽  
Concentration Of Ions ◽  
Surface Active ◽  
Fouling Organisms ◽  
Aluminoborate Glass

Concerns about the bioaccumulation of toxic antifouling compounds have necessitated the search for alternative strategies to combat marine biofouling. Because many biologically essential minerals have deleterious effects on organisms at high concentration, one approach to preventing the settlement of marine foulers is increasing the local concentration of ions that are naturally present in seawater. Here, we used surface-active borate glasses as a platform to directly deliver ions (Na + , Mg 2+ and BO 4 3− ) to the adhesive interface under acorn barnacles ( Amphibalanus ( =Balanus ) amphitrite ). Additionally, surface-active glasses formed reaction layers at the glass–water interface, presenting another challenge to fouling organisms. Proteomics analysis showed that cement deposited on the gelatinous reaction layers is more soluble than cement deposited on insoluble glasses, indicating the reaction layer and/or released ions disrupted adhesion processes. Laboratory experiments showed that the majority (greater than 79%) of adult barnacles re-attached to silica-free borate glasses for 14 days could be released and, more importantly, barnacle larvae did not settle on the glasses. The formation of microbial biofilms in field tests diminished the performance of the materials. While periodic water jetting (120 psi) did not prevent the formation of biofilms, weekly cleaning did dramatically reduce macrofouling on magnesium aluminoborate glass to levels below a commercial foul-release coating. This article is part of the theme issue ‘Transdisciplinary approaches to the study of adhesion and adhesives in biological systems’.

Microtribological properties of hard amorphous carbon protective coatings for thin-film magnetic disks and heads

1997 ◽  
Vol 211 (4) ◽  
pp. 365-372 ◽  
Author(s):  
V N Koinkar ◽  
B Bhushan
Keyword(s):  
Amorphous Carbon ◽  
Carbon Coating ◽  
Protective Coatings ◽  
Ion Beam ◽  
Crystal Silicon ◽  
Carbon Coatings ◽  
Magnetic Disks ◽  
Hydrogenated Amorphous Carbon ◽  
Hydrogenated Amorphous ◽  
Cathodic Arc

For long durability of magnetic media and head sliders, protective overcoats of hydrogenated amorphous carbon (a-C:H) are generally used. In this study, microtribological studies of hydrogenated amorphous carbon coatings deposited on a single-crystal silicon using three different deposition techniques—sputtering, ion beam and cathodic arc—were studied using atomic force/friction force microscopy (AFM/FFM). Roughnesses of all coatings at two scan sizes of 1 μm × 1 μm and 10 μm × 10 μm are comparable. Surface topography of sputtered carbon coating shows some particulates on the surface. Cathodic arc carbon coating exhibits the lowest coefficient of friction value followed by ion beam and sputtered carbon coatings. Microscratch and wear resistance and nanohardness of cathodic arc carbon coating are superior to those of ion beam and sputtered carbon coatings. Cathodic arc deposited carbon coatings are potential candidates for magnetic disks and heads.

scholarly journals PROPERTIES OF NITROGEN-DOPED AMORPHOUS CARBON COATINGS OBTAINED BY IMPULSE VACUUM-ARC METHOD

2018 ◽  
Vol 59 (9) ◽  
pp. 68 ◽  
Author(s):  
Aleksandr I. Poplavskiy ◽  
Aleksandr Ya. Kolpakov ◽  
Marina E. Galkina ◽  
Igor Yu. Goncharov ◽  
Roman A. Lyubushkin ◽  
...  
Keyword(s):  
Amorphous Carbon ◽  
Carbon Coating ◽  
Vacuum Arc ◽  
Internal Stresses ◽  
Structure And Properties ◽  
Carbon Coatings ◽  
Nitrogen Doped ◽  
Structure Surface ◽  
Amorphous Carbon Coatings ◽  
Carbon Plasma

The paper presents results of the research of the structure and properties of nitrogen-doped amorphous carbon coatings obtained in the vacuum from the flow of pulsed carbon plasma. The doping by nitrogen of carbon coating was determined to lead to increases in electrical conductivity, reductions of internal stresses, reduce of density, hardness and modulus, and to the change in structure, surface morphology and tribological characteristics.

scholarly journals A density functional theory study of the carbon-coating effects on lithium iron borate battery electrodes

2017 ◽  
Vol 19 (3) ◽  
pp. 2087-2094 ◽  
Author(s):  
Simon Loftager ◽  
Juan María García-Lastra ◽  
Tejs Vegge
Keyword(s):  
Density Functional Theory ◽  
Cathode Material ◽  
Carbon Coating ◽  
Density Functional ◽  
Li Ion Battery ◽  
Density Functional Theory Study ◽  
Iron Borate ◽  
Functional Theory ◽  
Carbon Coatings ◽  
Li Ion

Density functional theory modelling shows that carbon coatings on a LiFeBO3 cathode material does not impede the Li transport in a Li-ion battery.

scholarly journals Variation of carbon coatings on the electrochemical performance of LiFePO4 cathodes for lithium ionic batteries

RSC Advances ◽  
2017 ◽  
Vol 7 (70) ◽  
pp. 44296-44302 ◽  
Author(s):  
Weiwei Jiang ◽  
Mengqiang Wu ◽  
Fei Liu ◽  
Jian Yang ◽  
Tingting Feng
Keyword(s):  
Electrochemical Performance ◽  
Carbon Coating ◽  
Rate Capability ◽  
Superior Performance ◽  
Hard Carbon ◽  
Carbon Coatings ◽  
Soft Carbon

Asphalt-derived and glucose-derived carbon proved to be soft carbon-coating (SCC) and hard carbon-coating (HCC), and it was found that LFP/SCC showed a superior performance in capacity and rate capability than that of LFP/HCC.

scholarly journals Structural properties of carbon composites doped with boron

2020 ◽  
Vol 99 (3) ◽  
pp. 31-37
Author(s):  
D.G. Piliptsou ◽  
◽  
A.S. Rudenkov ◽  
A.V. Rogachev ◽  
Е.А. Kulesh ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Carbon Coating ◽  
Chemical Interaction ◽  
Carbon Layer ◽  
Grain Structure ◽  
Plasma Synthesis ◽  
Carbon Coatings ◽  
Boron Doped ◽  
Carbon Structures ◽  
Atom Interaction

The article considers morphology, chemical and phase composition of composite boro-carbon coatings, received by ion-plasma synthesis, depending on the boron content. Specimens of carbon coating doped with boron were obtained in vacuum unit by combined method coupled with co-deposition of carbon layer from pulse carbon plasma and its doping with boron atom flow. The obtained specimens of composite CC had embedded boron atoms with various concentration (NB), namely, 2.3 at.% were contained in ɑ-С91.2:B2.3, in ɑ-С79.3:B17.4 — 17.4 at.%, in ɑ-С53.3:B43.2 — 43.2 at.%. Carbon structures and carbon clusters graphitization were examined by X-ray photoelectron spectroscopy and Raman spectroscopy. Aiming at chemical interaction between carbon and boron in CC establishment we conducted mathematical processing of XPS for energy states C1s, B1s, O1s of carbon, boron and oxygen atoms. XPS C1s was presented as peaks superposition with centers located at 284.5; 285.5; 283.5 and 288 eV and consequently responsible for Csp2 , Csp3, C–B and C–О carbon atom interaction. With the growth of NB in boron-doped carbon coating a grain structure is formed, its size and grain orientation regarding the surface of the substrate increase, resulting in a decrease in the coating layer surface roughness.

scholarly journals Outstanding Nobility Observed in Cu5 Clusters Reveals the Key Role of Collective Quantum Effects

2021 ◽  
Author(s):  
David Buceta ◽  
Shahana Huseyinova ◽  
Miguel Cuerva ◽  
Héctor Lozano ◽  
Lisandro J. Giovanetti ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Metal Clusters ◽  
Bulk Material ◽  
Chemical Properties ◽  
Quantum Effects ◽  
High Concentration ◽  
X Ray ◽  
Potential Applications ◽  
New Generation

Subnanometer-sized metal clusters often feature a molecule-like electronic structure, which makes their physical and chemical properties significantly different from those of nanoparticles and bulk material. Considering potential applications, there is a major concern about their thermal stability and susceptibility towards oxidation. Cu clusters of only 5 atoms (Cu<sub>5</sub> clusters) are first synthesized in high concentration using a new-generation wet chemical method. Next, it is shown that, contrary to what is currently assumed, Cu<sub>5</sub> clusters display nobility, beyond resistance to irreversible oxidation, at a broad range of temperatures and oxygen pressures. The outstanding nobility arises from an unusual reversible oxidation which is observed by <i>in situ</i> X-ray Absorption Spectroscopy and X-ray Photoelectron Spectroscopy on Cu<sub>5</sub> clusters deposited onto highly oriented pyrolitic graphite at different oxygen pressures and up to 773 K. This atypical property is explained by a theoretical approach combining different state-of-the-art first principles theories. It reveals the essential role of collective quantum effects in the physical mechanism responsible for the nobility of Cu<sub>5</sub> clusters, encompassing a structural ‘breathing’ through concerted Cu–Cu elongations/contractions upon O<sub>2</sub> uptake/release, and collective charge transfer as well. A predictive phase diagram of their reversible oxidation states is also delivered, agreeing with the experimental observations. The collective quantum effects responsible of the observed nobility are expected to be general in subnanometer-sized metal clusters, pushing this new generation of materials to an upper level.

Multicriteria optimization of technological parameters for obtaining composite material Pb-C and carbon coating

2020 ◽  
pp. 166-174
Author(s):  
С.Н. Сергеенко ◽  
А.Н. Васильев ◽  
Д.В. Василенко
Keyword(s):  
Composite Material ◽  
Multicriteria Optimization ◽  
Carbon Coating ◽  
Lead Acid Battery ◽  
Technological Parameters ◽  
Carbon Coatings ◽  
Graphite Content ◽  
Technological Factors ◽  
Battery Electrode ◽  
Optimal Values

Предложена методика и проведена многокритериальная оптимизация значений технологических факторов получения порошкового композиционного материала Pb-C и углеродных покрытий. Определены оптимальные значения: - содержания и типа армирующих нитей, обеспечивающих повышенный комплекс механических свойств при минимальном содержании армирующих нитей; - содержания графита и продолжительности механической активации шихты, обеспечивающих повышенные значения прочности на срез и твердости композиционного материала Pb-C электрода свинцово-кислотного аккумулятора при утилизации отходов. На основе проведенной многокритериальной оптимизации предложены улучшенные технологические схемы изготовления композитов. A technique is proposed and a multicriteria optimization of the values of technological factors for obtaining a powder composite material Pb-C and carbon coatings is carried out. The optimal values have been determined: - the content and type of reinforcing threads, providing an increased set of mechanical properties with a minimum content of reinforcing threads; - the graphite content and the duration of the mechanical activation of the mixture, providing increased values of shear strength and hardness of the composite material Pb-C lead-acid battery electrode during waste disposal. Basierend auf der Multikriteria-Optimierung werden verbesserte technologische Schemata für die Herstellung von Verbundwerkstoffen vorgeschlagen.

TRIBOLOGICAL PROPERTIES OF TI/A-C:H NANOCOMPOSITE CARBON BASED COATINGS

Tribologia ◽  
2016 ◽  
Vol 267 (3) ◽  
pp. 109-117
Author(s):  
Marcin KOT ◽  
Łukasz MAJOR ◽  
Jurgen LACKNER ◽  
Kinga CHRONOWSKA-PRZYWARA
Keyword(s):  
Friction Coefficient ◽  
Tribological Properties ◽  
Fracture Resistance ◽  
Carbon Coating ◽  
Vacuum Chamber ◽  
Elasticity Modulus ◽  
Gas Flows ◽  
Scratch Testing ◽  
Carbon Coatings ◽  
Wear And Friction

The paper presents the results of mechanical and tribological tests of Ti/a-C:H nanocomposite carbon coatings and a-C:H hydrogenated carbon coating. All coatings were deposited by magnetron sputtering technique at various acetylene gas flows in a vacuum chamber, resulting in different coatings properties. The conducted study determines hardness, elasticity modulus, fracture resistance, and tribological properties – wear and friction coefficient of deposited coatings. The lowest wear and coefficient of friction were exhibited coatings deposited at higher acetylene flows, 15-20 sccm. However, they are brittle and the critical load in scratch testing is several times smaller than in a case of softer coatings deposited at lower acetylene flow up to 10 sccm.

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