Porous matrixes based on ion-irradiated polymer as templates for synthesis of nanowires

Irradiation with swift heavy ions is usually used for production of track membranes (nuclear filters). These membranes traditionally used as filters for fine filtration in medicine and biology. Another application is matrixes for so called matrix synthesis. The idea of this technique is to fill pores by any desired material- metal,polymer, semiconductor and so on. This work is devoted to formation of membrane for template synthesis, to investigation of filling process and to study some properties of obtained structures. It was found that filtration track membranes are not the best material for template synthesis –another type of matrixes are needed- with different pores profiles and parallel pores orientation These parameters could be obtained during irradiation. Different types of etching gave possibility to vary by will the shape of the pores and to obtain pores with conical shape. The process of etching in the alkali solution in mixture of water and alcohol was investigated. The main part of the work devoted to fabrication of micro- and nanowires via electrodeposition. Different types of metals-copper, silver, cobalt and nickel were used for galvanic deposition of the pores. Two types of the processes- galvanostatic and potentiostatic were investigated. It was also demonstrated that obtained metallic nanowires could be used as the substrates for deposition of the probe (biological molecules) in mass-spectrometer. The application of such structures in non-linear optic was also described. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/2083

Probe microscopy in the study of the surface of aluminum alloys

The work was supported by the Grant of the RNF 14-19-01033-P (study of topography and elemental composition of the surface) and the State Task (№ State registration AAAA-A17-117021310379-5 - study of electrical properties of the surface). The authors are grateful to N.A. Belov (MISiS) for providing samples

Problem of doping in sport among students of secondary schools and sport oriented educational institutions

Objective: to study the attitude towards doping among students in Russian sport. Materials and methods: sociological quantitative on-line research using river-sampling was conducted among students of secondary and high school education engaged in physical culture on a regular basis and also among students choosing a specialization in the sphere of physical culture and sport including supplementary education programs of secondary specialized education. Study included 450 secondary school students (Group#l) and 450 secondary specialized education students in the sphere of physical culture and sport (Group#2). Results: the research carried out that the students’ attitude towards doping was similar. Negative assessment of misuse of prohibited substances was consistent alongside with support of anti-doping educational programs and activities. Low level of awareness about the issue of doping in sport was detected. Conclusions: creating and implementing robust anti-doping educational program aimed at different target audiences (taking into account sport specific and awareness level) are the main ways to the effective fight against doping in sport

Tribological Tests Effect on Changes in the Surface Layers of Iron-Containing Antifrictional Aluminum Alloys

Antifrictional properties and surface parameters of Al-Si-Cu-Sn-Pb alloys have been investigated. The effect of iron addition (~1%) on the structure and tribological properties of aluminum alloy samples has been studied. Tribological properties were explored using the “shoe-roller” scheme with step-by-step pressure changes. The investigations were carried out both in and without a lubricant. The SEM- (with elemental analysis) and SPM-microscopy methods were applied to study sample surface and under-surface layers of the samples at the transversal sections. After tribological tests have been carried out, the topography of both surface and under-surface layers at the transversal sections has been studied. During the tests without lubrication solid particles, presumably, oxides were formed. The particles increase the surface destruction, thus, doing their part of an abrasive and contributing to (scuffing) score. After testing in the lubricant particles containing silicon and copper and having a rounded shape were also formed. These particles remain on the surface and are rolled in the lubricant. They creating a kind of a “protective cover” contributing to the contact pair stable operation. The under-surface layer 50–100 μm thick formation was found at the sections after tribological tests without lubrication. The samples sections were prepared after testing with lubrication. The study of the samples sections demonstrated the formation of the under-surface layer with thickness 30–40 μm. The elements redistribution in these layers was shown. After the tribological tests were carried out, the counterbodies (rollers) were also explored. The SPM method has been shown the film formed on the surface is uneven in thickness after tests without lubrication. This leads to the macrorelief development during friction and can lead to (scuffing) score. On the contrary, after tests in lubricant the secondary structures film formed is distributed on the surface as a thin uniform layer. This film has the protective properties. It was shown that alloys containing iron (up to 1%) have good tribological characteristics when tested both in and without the lubricant. Thus, they can be used as antifrictional materials

Technologies of distant education at the chemistry department of Moscow State University by M. V. Lomonosov. Development dynamics

В работе представлены результаты и опыт внедрения дистанционных образовательных технологий в учебный процесс на химическом факультете МГУ имени М. В. Ломоносова.This work presents the results and experience of introduction of distant education technologies at the Chemistry Department of M. V. Lomonosov Moscow State University

Methods of probe microscopy in the study of topography and elastic properties of cold-resistant elastomers

The work was carried out under the financial support of the Russian Science Fund, grant 14-29-00198-П(sample preparation and scanning electron microscopy) and the Federal Agency of Scientific Organizations - Agreement No 007-ГЗ/Ч3363/26 (scanning probe microscopy)

SEM and SPM studies of friction composite materials based on carbon graphitized fibers

The work was supported by the Russian Scientific Foundation (project no. 19-19-00548)