Browsing by Author "Serdiuk, Vitalii"
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Item Application of alloyed industrial oil in friction units of power equipment(Lviv Polytechnic Publishing House, 2016) Kovalenko, Tetiana; Serdiuk, Vitalii; Lviv Polytechnic National UniversityPolyfunctional lubricant performance properties indicates its significant impact on the longevity and efficiency of work of contact pairs. Therefore, the correct choice of lubricant depends on energy consumption to overcome friction, wear of rubbing surfaces. The most economical way for the improvement of work of the friction units in different environmental conditions is the development of new lubricant compositions with the addition of an effective multifunctional additives as so base oils don't meet all of requirements put forward to them. The polymethacrylate additives with enhanced functionality were obtained in this work. The influence of the concentration of the additives on the viscosity-temperature, depressor and anti-wear properties of industrial oil I-20A were studied. Found that received additives improve the performance properties of oil-20A, respectively, contribute the reliable lubrication of the friction units in power plants at different natural conditions.Item Formation of polymer microcapsules with encapsulated Fe3O4 magnetic nanoparticles(Lviv Polytechnic Publishing House, 2015) Melnyk, Roman; Serdiuk, Vitalii; Kovalenko, Tetiana; Lviv Polytechnic National UniversitySurface functionalized iron oxide magnetic nanoparticles (MNPs) are a kind of novel functional materials, which can be widely used in biotechnology and catalysis as magnetic separation systems. Therefore the goal of our work was to study preparation of encapsulated MNPs by elaborated extraction-coacervation technique using synthesized heterofunctional acrylate copolymer. Magnetite MNPs modified by oleic acid were synthesized and used in encapsulation process. Developed encapsulation technique allowed to obtain microcapsules with Fe3O4 nanoparticles encapsulated in paraffin core possessing magnetic properties and covered by heterofuntional copolymer shell.Item Formation of polymeric microcapsules with encapsulated hexane by extraction-coacervation technique(Видавництво Львівської політехніки, 2013) Borova, Solomiya; Serdiuk, Vitalii; Shevchuk, OlehThe formation of polymer microcapsules containing encapsulated hexane on the basis of synthesized heterofunctional tetrapolymer as shell-building material using the developed “extraction-coacervation” method of microencapsulation was performed. The effect of process parameters on the final size of microcapsules and efficiency of hexane encapsulation was studied.Item Synthesis of microcapsules with encapsulated magnetic nanoparticles for α-amylase immobilization(Видавництво Львівської політехніки, 2017-12-23) Melnyk, Roman; Serdiuk, Vitalii; Shevchuk, Oleh; Tokarev, Viktor; Lviv Polytechnic National UniversityPolymeric microcapsules with paraffin core containing magnetite nanoparticles modified by oleic acid and functional polymeric shell were synthesized using the technique of "extraction-coacervation" microencapsulation. The influence of process parameters onto colloidal chemical properties (size, dispersity index, surface porosity) of synthesized microcapsules was studied. It was shown that the use of heterofunctional copolymer as microcapsule shell allows the possibility of irreversible immobilization of α- amylase and provide its participation in the reaction of starch catalytic decomposition.