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Mechanisms of electrical conductivity, quantum capacity and negative capacitance effects in InSe (PTHQ) nanohybrid

Ivashchyshyn Fedir, Maksymych Vitaliy, Calus Dariusz, Klapchuk Myroslava, Baryshnikov Glib, Galagan Rostislav, Litvin Valentina, Chabecki Piotr, Bordun Ihor

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2022

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Vol. 70, nr 1

art. no. e139958

EN

In this work, we present findings on the syntheses and study of properties of InSe < PTHQ > nanohybrid. The introduction of guest component in GaSe matrix leads to an increase in inhomogeneities, which is clearly confirmed by the strengthening of the low-frequency horizontal branch of Nyquist diagrams. A constant magnetic field counteracts this effect and changes the behavior of the impedance hodograph at low frequencies to the opposite. Illumination leads to a colossal increase in quantum capacitance, which is clearly demonstrated in the Nyquist diagram. For the synthesized InSe < PTHQ > nanohybrid the interesting behavior of the current-voltage characteristic is reported. As a result of studies of the synthesized InSe < PTHQ > nanohybrid the effect of “negative capacity” is observed, the magnitude of which can be controlled by the electric field. Based on the constructed impedance model and proposed N-barrier model, the physical mechanisms of the investigated processes are suggested.

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Structural, magnetic and adsorption characteristics of magnetically susceptible carbon sorbents based on natural raw materials

Soloviy Christina, Malovanyy Myroslav, Bordun Ihor, Ivashchyshyn Fedir, Borysiuk Anatoliy, Kulyk Yuriy

Journal of Water and Land Development

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2020

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no. 47

160--168

EN

The article comprises synthesis of magnetically susceptible carbon sorbents based on bio raw materials – beet pulp. The synthesis was performed by one- and two-step methodology using FeCl3 as an activating agent. X-ray diffraction methods showed an increase in the distance between graphene layers to 3.7 Å in biocarbon synthesized by a two-step technique and a slight decrease in inter-graphene distance to 3.55 Å for biocarbon synthesized by an one-step technique. In both magnetically susceptible samples, the Fe3O4 magnetite phase was identified. Biocarbon synthesized by a two-step technique is characterized by a microporous structure in which a significant volume fraction (about 35%) is made by pores of 2.2 and 5 nm radius. In the sample after a one-step synthesis, a significant increase in the fraction of pores with radii from 5 to 30 nm and a decrease in the proportion of pores with radii greater than 30 nm can be detected. Based on the analysis of low-angle X-ray scattering data, it is established that carbon without magnetic activation has the smallest specific area of 212 m2∙сm–3, carbon after one-stage synthesis has a slightly larger area of 280 m2∙сm–3, and after two-stage synthesis has the largest specific surface area in 480 m2∙сm–3. The adsorption isotherms of blue methylene have been studied. Biocarbon ob-tained by two-step synthesis has been shown to have significantly better adsorption properties than other synthesized biocarbons. Isotherms have been analysed based on the Langmuir model.

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Aspects of Electrochemically Activated Water Solutions Practical Use

Ptashnyk Vadym, Bordun Ihor, Pohrebennyk Volodymyr, Kida Małgorzata, Ziembowicz Sabina, Koszelnik Piotr

Journal of Ecological Engineering

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2020

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Vol. 21, nr 7

222--231

EN

This article analyzes the issue of developing ecologically safe technologies for obtaining the electrochemically activated water solutions for ensuring the rational use of water resources and reducing the volume of discharges of harmful substances into the environment. The necessity of controlling the depth of electrochemical activation for obtaining ecologically safe industrial water solutions and reducing the energy consumption of this process was substantiated. The ecological advantages of electrochemically activated solutions application were presented as compared to the chemical solutions in the technologies of activated carbon surfaces modification to increase the supercapacitors electrode specific capacitance, preparation of the gypsum plaster mixing water to improve the physicochemical properties of gypsum stone, as well as efficiency of use of disinfectant based on the electrochemically activated water solutions solutions, approbated in the sugar production industry. It was experimentally confirmed that the depth of electrochemical activation significantly affects the efficiency of practical use of activated water solutions. The proposed theoretical models allow prediction of the activation modes for solving specific problems.

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Separacja proszków węglowych o dużym stopniu rozproszenia za pomocą metody tryboelektrycznej

Chabecki Piotr, Bordun Ihor, Ivashchyshyn Fedir

Przegląd Elektrotechniczny

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2019

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R. 95, nr 1

81--84

PL

W artykule zostały przeanalizowane warunki rozdzielenia materiałów węglowych za pomocą metody tryboelektrycznej. Została opracowana konstrukcja i wykonane urządzenie powietrznej separacji tryboelektrycznej z oddzielaczem bębnowym. W drodze eksperymentu ustalono, że zastosowanie wibracji podczas podawania proszku do bębna oraz obróbka cieplna proszków istotnie wpływa na wartość tryboładunków. W celu uzyskania dobrego wyniku rozdzielenia materiałów węglowych konieczne jest osuszenie. Materiał osusza się w temperaturze 100 – 120 оС. Otrzymane za pomocą separacji frakcje węglowe zastosowano do budowy superkondensatorów. Określono pojemność właściwą. Ustalono, że największą pojemność właściwą posiada materiał zawierający cząstki o wymiarach 1-10 μm.

EN

The article deals with conditions for carbon materials separation by triboelectric method. A triboelectric air separation device with a drum separator was designed and constructed. It was proved by experimentation that use of vibrations during the powder’s entry into the drum and thermal treatment has a significant effect on the tribocharge value. To achieve good results of carbon material separation, drying is required. The material is dried at 100о-120оC. The carbon fractions acquired by separation were used in construction of ultracapacitors. Specific capacitance was established; with the highest capacitance achieved by material containing particles in 1-10 μm size range.