Vol 5, No 16 (2017)
- Year: 2017
- Published: 17.12.2017
- Articles: 10
- URL: https://ogarev-online.ru/2311-2468/issue/view/18981
Full Issue
Preparation and testing of polyurea-cellulose composite
Abstract
The goal of this study was to obtain composite materials based on commercial polyurea composition and cellulose-containing additives. The resulting composites were studied by IR spectroscopy and electron microscopy. The results of the mechanical tests for tensile strength are provided. It is shown that the composite material has a significantly higher strength than the unmodified polyurea. The dependence of the mechanical properties on the content of the cellulose- containing component was determined.
The influence of water qualitative composition on strength of cement stone filled with zeolite-containing rock
Abstract
Through the static contact of phases, the interaction of natural and waste water with cement stone has been studied. A kinetic analysis of the system "cement stone – water" was carried out. A conclusion is made about the corrosion of cement stone depending on the nature of the water and the degree of filling with zeolite-containing rock.
Synthesis and sorption properties of nanosized magnesium phosphate in relation to nickel (II) ions
Abstract
Nanosized, microsized and cryogranular magnesium phosphate was obtained. The sorption characteristics of the obtained samples with respect to nickel (II) ions in aqueous solutions are determined. The structure of the sorbent samples before and after sorption is established. The adsorption isotherm of nickel (II) ions is made. The mechanism of nickel (II) ions sorption by synthesized samples is determined. The effect of the acidity of the medium on the sorption has been established.
The effect of calcination temperature of natural diatomite on quality of synthesized silica
Abstract
The effect of the calcination temperature of diatomite on the quality of synthesized amorphous microsilica was studied. It was found that the synthesis of silica from calcined diatomite, at a temperature of no higher than 500 oC for 2 hours or less, makes it possible to obtain amorphous silica of high purity, containing 99,63‒99,30% SiO2 and minor impurities of iron oxide, aluminum oxide, etc.
Potentiometric flow-injection testing of total iron in natural magnetite
Abstract
A technique for potentiometric flow-injection testing of total iron in natural magnetite is proposed. As a stream, a solution with an excess of oxidizer corresponding to the end of the jump on the curve of potentiometric titration of Mohr's salt with potassium dichromate was used and prepared on-line using a multichannel peristaltic pump. The technique is characterized by high productivity (up to 60 samples / h), minimal set and consumption of reagents (total volume of all solutions does not exceed 10,0 cm3 for one test), simplicity and cheapness of instrumentation. The relative standard deviation (Sr) for testing 2,0 ∙ 10‒2 mol / l Fe2+ does not exceed 0,04.
The use of ALD method for deposition of Al2O3 on the surface of electrochemically activated aluminium
Abstract
The methods of directed synthesis have been developed and the optimal conditions for the formation of structures consisting of aluminum with a given morphology and thickness have been selected. According to the data of scanning electron microscopy (SEM) and scanning probe microscopy (SPM), an ordered structure of cylindrical channels located at an angle of 45° to the substrate, as well as porous nanostructured layers with a hexagonal arrangement of pores, is formed on the Al surface, depending on the production conditions.
The effect of organic ligands on chemical and electrochemical nickel plating of copper
Abstract
The paper presents a large amount of data on the effect of O- and N-containing additives on chemical nickel plating of copper. It has been established that N-containing additives essentially increase the speed of chemical nickel plating of copper. In the presence of O-containing additives the process of chemical nickel plating does not proceed. The main criterion for the effective nickel plating is the possibility of nickel ions to form cationic complexes with low reduction potentials.
The effect of temperature on synthesis of nanosized LiFePO4 films by ald technology
Abstract
Nanosized LiFePO4 films have been synthesized by atomic layer deposition method. The effect of temperature on the efficiency of the deposition of thin LiFePO4 films was studied. A conclusion was drawn on the effect of temperature on the atomic layer deposition process. The synthesis of LiFePO4 was carried out in accordance with the optimum temperature.