Zobrazeno 1 - 10
of 97
pro vyhledávání: '"Valerii Kotok"'
Autor:
Peter Ondrejka, Michaela Sojková, Valerii Kotok, Patrik Novák, Ivan Hotovy, Martin Kemény, Miroslav Mikolášek
Publikováno v:
Materials Research Express, Vol 10, Iss 6, p 065508 (2023)
Nickel-based sulfides (particularly NiS _2 ) are regarded as promising materials for highly efficient electrochemical generation and storage devices. The conventional fabrication methods of nanostructured NiS _X electrodes involve several complex ste
Externí odkaz:
https://doaj.org/article/18d60dc3410a46f5b6b21a9c6283ea42
Autor:
Bohdan Murashevych, Dmitry Girenko, Mykola Toropin, Iryna Koshova, Vadym Kovalenko, Oleg Lebed, Vasyl Chuiko, Valerii Kotok, Dmytro Stepanskyi
Publikováno v:
Eastern-European Journal of Enterprise Technologies. 2:32-42
The increase in the frequency and scale of epidemics of infectious diseases gives extreme urgency to the development of new technologies for antiseptic and disinfectant treatment of various media, as well as materials/reagents for their implementatio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::220d7f9eb425f2607788083809efb1a3
https://doi.org/10.15587/1729-4061.2023.278000
https://doi.org/10.15587/1729-4061.2023.278000
Autor:
Vadym Kovalenko, Valerii Kotok, Dmitriy Girenko, Mykola Nikolenko, Dmytro Andreiev, Volodymyr Verbitskiy, Volodymyr Medianyk, Svetlana Morozova, Rovil Nafeev
Publikováno v:
Eastern-European Journal of Enterprise Technologies. 1:58-65
Nickel hydroxides are widely used as electrochemically active substances in alkaline batteries and hybrid supercapacitors; they can be used for electrocatalysis, in electrochemical sensors, and as pigments. Knowledge of the formation mechanism of nic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::de99b7fbec30ffe7c6244af0b8792799
https://doi.org/10.15587/1729-4061.2023.272673
https://doi.org/10.15587/1729-4061.2023.272673
Autor:
Vadym Kovalenko, Valerii Kotok, Anton Dopira, Gregorio Guadalupe Carbajal Arizaga, Volodymyr Verbitskiy, Volodymyr Medianyk, Oksana Berzenina, Inna Anataichuk
Publikováno v:
Eastern-European Journal of Enterprise Technologies. 4:6-15
A simple mechanical method (grinding and sieving) was proposed to separate the composite into carotenoid-enriched and LDH-enriched materials. The method is based on the internal self-abrasion of the composite when grinding solid particles of LDH as g
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bd559995818bd0becc211afddc88671a
https://doi.org/10.15587/1729-4061.2022.263169
https://doi.org/10.15587/1729-4061.2022.263169
Autor:
Valerii Kotok, Vadym Kovalenko, Miroslav Mikolasek, Peter Ondrejka, Oleksandra Zima, Inna Anataichuk, Dmitriy Vodopyan, Kostyantyn Sukhyy
Publikováno v:
Eastern-European Journal of Enterprise Technologies. 3:58-65
The cost of electrochromic “smart” windows ranges from 200–800USD/m2. The high cost is determined by the small volume of production and the high cost of vacuum methods for applying device layers. The development of other methods could lead to l
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::976fc91f2bf80b7caba78699f25b23a3
https://doi.org/10.15587/1729-4061.2022.259329
https://doi.org/10.15587/1729-4061.2022.259329
Autor:
Vadym Kovalenko, Valerii Kotok, Anastasiia Borysenko, Anton Dopira, Anhelina Rezvantseva, Rovil Nafeev, Volodymyr Verbitskiy, Dmitry Sukhomlyn
Publikováno v:
Eastern-European Journal of Enterprise Technologies. 3:52-59
Pigments are the main components of cosmetics, which determine both toxicity and consumer color characteristics. Zn-Al layered double hydroxides intercalated with anionic food dyes are promising pigments. The best sources of dyes for intercalation ar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::85342dba6398515c4d20f29cc21f6aa9
https://doi.org/10.15587/1729-4061.2022.260170
https://doi.org/10.15587/1729-4061.2022.260170
Publikováno v:
Eastern-European Journal of Enterprise Technologies. 1:24-30
Obtaining new types of composite coatings for various purposes is the most important direction in chemistry. The synthesis of composite hydroxide-sulfide compounds can be useful in various areas of applied electrochemistry. Using a simple two-step me
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a6e8d78c8c8b5becdd7b5f0cb74672a8
https://doi.org/10.15587/1729-4061.2022.252634
https://doi.org/10.15587/1729-4061.2022.252634
Autor:
Vadym Kovalenko, Anastasiia Borysenko, Valerii Kotok, Rovil Nafeev, Volodymyr Verbitskiy, Olena Melnyk
Publikováno v:
Eastern-European Journal of Enterprise Technologies. 1:12-20
Layered double hydroxides, especially Zn-Al, are valuable matrices for intercalation with various functional anions: dyes, medicines, food additives, etc. For the purposeful development and optimization of the technology for the synthesis of Zn-Al hy
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fd15d42ba29eb417706f6a8ca8f27d01
https://doi.org/10.15587/1729-4061.2022.252738
https://doi.org/10.15587/1729-4061.2022.252738
Autor:
Vadym Kovalenko, Valerii Kotok
Publikováno v:
Eastern-European Journal of Enterprise Technologies, Vol 6, Iss 6 (114), Pp 32-38 (2021)
Nail polish, in particular gel polish, is the most commonly used cosmetic product. A component of the gel polish, which determines the consumer color characteristics of the gel polish. Layered double hydroxides (LDH) are promising pigments. To expand
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::abd0cc50aab94fad05b06c9b8268458d
https://doi.org/10.15587/1729-4061.2021.247160
https://doi.org/10.15587/1729-4061.2021.247160
Autor:
Valerii Kotok, Vadym Kovalenko, Rovil Nafeev, Volodymyr Verbitskiy, Olena Melnyk, Iryna Plaksiienko, Igor Kovalenko, Viktoriia Stoliarenko, Valerii Plaksiienko, Iryna Zamrii
Publikováno v:
Eastern-European Journal of Enterprise Technologies, Vol 6, Iss 12 (114), Pp 27-33 (2021)
Electrochemical devices based on nickel hydroxide electrodes are used in different areas. The main ones are chemical current sources, variable transparency “smart” windows, devices for carrying out electrocatalytic reactions, sensors for determin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::779d3fa1f9a6665769393254ff0c249b
http://journals.uran.ua/eejet/article/view/246511
http://journals.uran.ua/eejet/article/view/246511