Research of properties of polymer compositions based on aluminosilicate microspheres

© 2020 IOP Publishing Ltd. All rights reserved. The paper presents the results of studies of polymer compositions based on aluminosilicate microspheres. Polyester resin Yarkopol-20 and epoxy glue ED-20, as well as grades of aluminosilicate microspheres K 500 and K150 were chosen as the binder of aluminosilicate microspheres. The obtained thermal conductivity coefficients are comparable with the thermal conductivity coefficients of materials such as fiber asbestos, wood, expanded clay concrete, etc

Determination of factors influencing the speed of moving arcs by rectanine electrodes

© 2020 Published under licence by IOP Publishing Ltd. A mathematical description of the gas motion in an electric discharge moving in the interelectrode gap under the action of the Lorentz force, considers in this paper. The presented model of the electric arc allows one to calculate the magnetic field acting on the charges in the discharge and to explain the occurrence of the arc shunting effect when moving along the electrodes

Powder production of from low-alloy steel by flame atomization

The advantages of plasma atomization technology in comparison with other methods of powder production for additive technologies are shown in this paper. Investigations of powders obtained by plasma atomization from welding wire sv-08G2S (similar to ER70S-6) with a diameter of 0.8 mm have been carried out. The size of the powders, their shape, chemical composition, microstructure and microhardness have been investigated

Study of the influence of hydroabrasive surface cleaning on a laser cutting

© 2020 IOP Publishing Ltd. All rights reserved. The example of laser cutting of 1.0038 steel shows the features of waterjet (EPS) cleaning. The influence of laser cutting parameters on ensuring the necessary quality and properties of steel is considered

Research of the influence of hydroabrasive surface cleaning on plasma cutting

© 2020 Published under licence by IOP Publishing Ltd. On the example of plasma cutting of 1.0038 steel, the features of hydroabrasive (EPS) cleaning are shown. The basic requirements for the quality of the cut surface and a wide range of material properties due to the characteristics of the power tool are formulated. The formation of the heat-affected zone, its structure and properties, the formation of macro-and microgeometry of the cut depending on the working gas used are described. The influence of plasma cutting parameters on ensuring the necessary quality and properties of steel is considered

Mitochondria-targeted mesoporous silica nanoparticles noncovalently modified with triphenylphosphonium cation: Physicochemical characteristics, cytotoxicity and intracellular uptake

Novel nanocomposite system based on mesoporous silica nanoparticles (MSNs) noncovalently modified with hexadecyltriphenylphosphonium bromide (HTPPB) has been prepared, thoroughly characterized and used for encapsulation of model cargo Rhodamine B (RhB). The high encapsulation efficacy of this dye by HTPPB-modified mesoporous particles was demonstrated by spectrophotometry and thermography techniques. The bioavailability of MSN@HTPPB was testified. Cytotoxicity assay revealed that a marked suppression of M−HeLa cancer cells (epithelioid carcinoma of the cervix) occurs at concentration of 0.06 μg/mL, while the higher viability of Chang liver normal cell line was preserved in the concentration range of 0.98–0.06 μg/mL. Hemolysis assay demonstrated that only 2% of red blood cells are destructed at ~ 30 μg/mL concentration. This allows us to select the most harmless compositions based on MSN@HTPPB with minimal side effects toward normal cells and recommend them for the development of antitumor formulations. Fluorescence microscopy technique testified satisfactory penetration of HTPPB-modified carriers into M−HeLa cells. Importantly, modification of the MSN with HTPPB is shown to promote efficient delivery to mitochondria. To the best of our knowledge, it is one of the first successful examples of noncovalent surface modification of the MSNs with lipophilic phosphonium cation that improves targeted delivery of loads to mitochondria