CONCEPT DEVELOPMENT: DESIGN AND EXPERIMENTAL ANALYSIS OF THE HEAT EXCHANGER / HEAT METER OPERATING CHARACTERISTICS FOR PERFORMING THERMAL VACUUM TESTS AT LOW TEMPERATURE USEFUL WORKLOAD FOR SPACECRAFTS DOI: 10.22184/1993-8578.2022.15.3-4.204.215
The concept of a heat meter is proposed to measure the heat load supplied to the thermal control system (TCS) from the scientific equipment operating at a temperature of minus 100 °С. A stable low temperature level maintained by the controlled phase transition of liquid flow. To maintain the preset temperature, a heater is applied.
STUDY OF A THERMAL MEMS SENSOR FOR GAS MASS FLOW RATE DOI: 10.22184/1993-8578.2022.15.3-4.216.221
Based on the experimental results of the thermal gas mass flow rate sensor it was shown that the use of various analogue signal processing circuits makes it possible to achieve uniquely high sensitivity and combine measurements of the temperature difference at the front, decline and drop of the temperature of the heater in a single signal.
MICRO-CONTAMINATION OF NANOSTRUCTURES AT MANUFACTURING IN VACUUM DOI: 10.22184/1993-8578.2022.15.3-4.224.231
Main sources of micro-contamination of the micro- and nanoelectronic devices in vacuum cluster-type processing equipment were analysed. Generation mechanism of microparticles flows at locks and processing vacuum chambers, molecular contamination and metal particles as a results of construction materials wear and tribo-desorption were shown.
RESEARCH OF THE PLATFORM FOR ACTIVE VIBRATION ISOLATION OF THE NANOTECHNOLOGICAL EQUIPMENT DOI: 10.22184/1993-8578.2022.15.3-4.232.238
The platform containing dampers based on a magnetorheological (MR) elastomer applied for active vibration isolation of nanotechnological equipment is described. The results of experimental studies of an active damper are presented and amplitude transmission coefficients of vibration displacements in the low-frequency range are determined.
BIODEGRADABLE FILM MATERIALS BASED ON POLYMER HYDROGELS AND SILVER NANOPARTICLES DOI: 10.22184/1993-8578.2022.15.3-4.196.203
This work deals with various aspects of obtaining and evaluating the effectiveness of biodegradable film materials based on polymer hydrogels and silver nanoparticles. Polyvinyl alcohol and potato and maize starch are used as a matrix in the materials under consideration. These polymers are safe for humans and allow of obtaining biodegradable materials. Introduction of silver nanoparticles into the film materials under consideration makes it possible to increase their antibacterial and fungicidal properties. The comparative analysis of the obtained film materials demonstrated the most promising materials based on polyvinyl alcohol and maize starch with silver nanoparticles (PVS/MaizeStarch/Agnano).
SCANNING CAPILLARY MICROSCOPY: TUMOUR CELLS VISUALISATION DOI: 10.22184/1993-8578.2022.15.3-4.168.173
Scanning capillary microscopy (or scanning ion-conductance microscopy) is a scanning probe microscopy technique based on the use of nanocapillaries. Important advantages of SCM over other methods are its non-violent action on a studied objects during measurements and a possibility to conduct studies in the natural environment (in liquid). Therefore, this method has become widely used in biological and medical research. Another unique advantage of SCM is the use of dual-channel capillaries which allows the technique to be used as a sensor, e.g. for measuring reactive oxygen species close to a cell.
FASHION FOR THE FLIRT MODE DOI: 10.22184/1993-8578.2022.15.3-4.178.185
In the laboratory studies using an atomic force microscope, contact and resonance modes are the most widely used allowing acquisition of scans in relatively short times. On the other hand, their disadvantage is the difficulty of controlling the force impact, which can lead to irreversible changes in the morphology of the sample.
This is particularly critical when scanning soft objects such as bacteria, cells, and polymers. In the contact mode this interaction occurs also due to frictional forces which magnitude is difficult to control when scanning the sample surface. In the resonance mode the influence of frictional forces is smoothed out by vertical motion of the probe; however, high quality of the cantilever oscillations does not allow controlling its force at sudden differences in topography of the observed surface. In order to overcome these obstacles, we have developed a mode of delicate and gentle surface scanning, which employs a light touch to the surface only. We have named this mode as flirt mode.
SYNTHESIS AND STUDY OF THE HYBRID METAL-CARBON SYSTEMS OPTICAL PROPERTIES: LINEAR-CHAIN CARBON FILMS DOPED WITH SILVER DOI: 10.22184/1993-8578.2022.15.3-4.186.194
The paper describes the synthesis technology and the results of studying optical properties of metal-carbon systems: films of linear-chain carbon doped with silver with optical spectrophotometry and spectral ellipsometry. The results of modeling and generalization of the obtained data with the help of artificial neural networks are presented.