Chemical behaviour of Al/Cu nanoparticles in water

Bimetallic Al/Cu nanoparticles with Al/Cu composition 10:90, 20:80, 40:60 were produced by method of simultaneous electrical explosion of metal pairs in the argon atmosphere. Nanopowders containing 20% and 40% (mass) of aluminum interacted with water at 40–70 °C and formed composite particles that were porous structures of nanopetal pseudoboehmite with nanosized copper-containing inclusions inside. Aluminum in nanopowder with Al/Cu composition 10:90 did not react with water, as far as it is in the phase of intermetallic compounds СuAl2 and Сu4Al9. Nanocomposite produced can be used as an active component of antibacterial agents

Synthesis and Characterization of Electro-Explosive Magnetic Nanoparticles for Biomedical Applications

Nowadays there are new magnetic nanostructures based on bioactive metals with low toxicity and high efficiency for a wide range of biomedical applications including drugs delivery, antimicrobial drugs design, cells' separation and contrasting. For such applications it is necessary to develop highly magnetic particles with less than100 nm in size. In the present study magnetic nanoparticles Fe, Fe[3]O[4] and bimetallic Cu/Fe with the average size of 60- 90 nm have been synthesized by electrical explosion of wire in an oxygen or argon atmosphere. The produced nanoparticles have been characterized with transmission electron microscopy, X-ray phase analysis, and nitrogen thermal desorption. The synthesized particles have shown antibacterial activity to gram-positive (S. aureus, MRSA) and gramnegative (E. coli, P. aeruginosa) bacteria. According to the cytological data Fe, Fe[3]O[4]and Cu/Fe nanoparticles have effectively inhibited viability of cancer cell lines Neuro-2a and J774. The obtained nanoparticles are promising for new antimicrobial drugs and antitumor agents' developmen

Synthesis and Characterization of Electro-Explosive Magnetic Nanoparticles for Biomedical Applications

Nowadays there are new magnetic nanostructures based on bioactive metals with low toxicity and high efficiency for a wide range of biomedical applications including drugs delivery, antimicrobial drugs design, cells' separation and contrasting. For such applications it is necessary to develop highly magnetic particles with less than100 nm in size. In the present study magnetic nanoparticles Fe, Fe[3]O[4] and bimetallic Cu/Fe with the average size of 60- 90 nm have been synthesized by electrical explosion of wire in an oxygen or argon atmosphere. The produced nanoparticles have been characterized with transmission electron microscopy, X-ray phase analysis, and nitrogen thermal desorption. The synthesized particles have shown antibacterial activity to gram-positive (S. aureus, MRSA) and gramnegative (E. coli, P. aeruginosa) bacteria. According to the cytological data Fe, Fe[3]O[4]and Cu/Fe nanoparticles have effectively inhibited viability of cancer cell lines Neuro-2a and J774. The obtained nanoparticles are promising for new antimicrobial drugs and antitumor agents' developmen

Preparation of nano/micro bimodal aluminum powder by electrical explosion of wires

Electrical explosion of aluminum wires has been shown to be a versatile method for the preparation of bimodal nano/micro powders. The energy input into the wire has been found to determine the relative content of fine and coarse particles in bimodal aluminum powders. The use of aluminum bimodal powders has been shown to be promising for the development of high flowability feedstocks for metal injection molding and material extrusion additive manufacturing

Development of the Logic Structure of the Educational Material Based on the Theory of Graphs

В статье разработана методика логического структурирования учебного материала с использованием теории графов, позволяющая увеличить доступность излагаемого материала. Построены две структурно-логических схемы: «Основная задача синтеза зубчатых зацеплений» и «Образование простейшего зубчатого механизма» раздела «Синтез зубчатых зацеплений» дисциплины «Теория механизмов и машин». Выполнен сравнительный анализ представленных структурно-логических формул и подтвержден практически.In the article a methodology developed for the logical structuring of educational material using graph theory, which allows to increase the availability of the material presented. Two structural logical schemes are constructed: «The main task of gear synthesis» and «The formation of the simplest gear mechanism» of the section «Gear coupling synthesis» of the discipline «Mechanisms and machines theory». A comparative analysis of the presented structural logical formulas is made and confirmed practically

Mathematical Modeling of Didactic Material

В статье разработана логическая структура учебного материала в виде графа, являющегося разновидностью математической модели. Представлена логическая схема раздела «Статика» дисциплины «Теоретическая механика» и курс «Сопротивление материалов». Математическое моделирование дидактического материала позволяет исследовать междисциплинарные связи общетехнического цикла дисциплин и перейти к следующему этапу проектирования - дидактическому конструированию учебного процесса.The article developed the logical structure of the educational material in the form of a graph, which is a kind of mathematical model. The logical diagram of the section "Statics" of the discipline "Theoretical Mechanics" and the course "Strength of materials" are presented. Mathematical modeling of didactic material allows us to explore the interdisciplinary connections of the general technical cycle of disciplines and move on to the next design stage - the didactic design of the educational process

Structural - Logical Connections of General Engineering Disciplines of Machine-Building Profile

В статье разработана методика построения структурно-графических схем логически связанного учебного материала разделов общеинженерных дисциплин машиностроительного профиля «Кинематика» курса «Теоретическая механика» и «Кинематический анализ» курса «Теория механизмов и машин» для исследования структурно-логических связей на основе теории графов. Построена структурно-логическая схема «Кинематика - кинематический анализ», позволяющая проектировать учебный материал в соответствии с поставленными целями и задачами образования.The article develops a method for constructing structural-graphic schemes of logically related educational material of sections of general engineering disciplines of the machine-building profile "Kinematics" of the course "Theoretical Mechanics" and "Kinematic Analysis" of the course "Theory of Mechanisms and Machines" for the study of interdisciplinary connections based on graph theory. A structural-logical scheme "Kinematics - kinematic analysis" has been built, which allows designing educational material in accordance with the goals and objectives of education

Investigation of the peculiarities of oxidation of Ti/Al nanoparticles on heating to obtain TiO2/Al2O3 composite nanoparticles

The creation of new nanomaterials with improved characteristics, as well as the development of new approaches to obtain such materials is an urgent task in science and technology. One of the promising directions in obtaining improved nanomaterials is the use of precursors in the form of multicomponent metal nanoparticles. Thermal oxidation of bimetallic Ti/ Al nanoparticles obtained by electrical explosion of wires was investigated in this work. Ti/Al nanoparticles have been found to be completely oxidized with the formation of composite TiO2/ Al2O3 nanoparticles after calcination at 900 °C. The formation of TiO2 phase with a rutile structure on heating to 500 °C, and the formation of TiO2 phases with a rutile and anatase structure, as well as α-Al2O3 on heating to 700 °C have been established, in addition to the residue of unoxidized metals. Complete oxidation of Ti/Al nanoparticles occurs when heated to 900 °C. The photochemical activity of TiO2/ Al2O3 composite nanoparticles obtained at 900 °C was studied. The degradation of methyl orange dye reached 55% under UV irradiation for 120 min