The article is devoted to the research and working out of calculation method of thermodynamic data and phase diagrams of pentonary alloy materials of low-melt
Article is devoted to the research and working out of calculation method of thermodynamic data and phase diagrams of ternary alloy materials of low-melt metals with the use of data bases known in literature.
Macrodeficiency of polymeric materials, including the
pervasive one, is a consequence of the development of
initial microdefects which appear in polymers both
due to external factors and during their processing. In
the article, the problem of the detection of structural
microdeficiency of various polymeric materials
through an assessment of their structural parameters is
solved. The considered materials possess
approximately identical degree of crystallinity (60 –
66%), but different density. The express assessment
technique of polymeric materials microdeficiency by
the sorption method with the use of the academician
M. M. Dubinin’s theory of volumetric micropore
filling is developed and evaluated. On the basis of a
quantitative assessment of sorption processes in
polymeric materials, including elastomeric
compositions – rubbers and rubberized fabrics, the
existence of the initial local microdefects arising in
the course of synthesis is established. In real
polymeric materials, including elastomeric
compositions – rubbers and rubberized fabrics, the
existence of the initial local microdefects arising in
the course of synthesis is established (the number of
microdefects n varies from 1x1017 sm-3 to 6x1019 sm-3
,
and the rated linear size k – from 2 nm to 7 nm). The
general reduction of microdeficiency in rubberized
fabrics in comparison with initial rubber is revealed
and rationalized
Macrodeficiency of polymeric materials, including the
pervasive one, is a consequence of the development of
initial microdefects which appear in polymers both
due to external factors and during their processing.
This article solves the task of identification the
interrelation and interdependence of structural
microdefects of various polymeric materials,
consisting in the estimation of the structural
parameters under uniaxial deformation. It is
experimentally shown that the process of changing
microdefects in the material bulk begins to flow more
intensely during deformation of the material, having
anisotropic structures in the bulk. Change of the
parameters of microdefects is not observed compared
to the starting material at small quantities of the
deformation. In the area of deformation corresponding
to the transition of the material from isotropic to
anisotropic state parameters of microdefects do not
depend on the degree of deformation of the sample,
and abrupt changes of the parameters of microdefects
are observed after completing the formation of
anisotropic patterns. It is shown experimentally the
identity of the parameters of microdefects in the bulk
material (rubber-based natural caoutchouc) during
deformation with the quantities of local deformations
at the edge of the artificially created macrodefects.
Under uniaxial deformation more than 280-300% and
the growth of the quantities of local deformations
come out at the edge of the artificially created
macrodefects and normalized linear dimension k and
decrease the total number n of microdefects
The method has been developed of simultaneous
determination of active ingredients of different kinds
of pesticides in biological tissues (fish liver) by
applying HPLC with ultra-violet detection and the
rapid method of QuEChERS sample preparation. We
defined optimum volume and composition of the
reagents for the extraction, time of centrifugation and
ultrasound treatment, the origin and composition of
sorbents that ensure maximum extraction of the
substances studied and further cleanup of interfering
substances. Acetonitrile was used as a solvent. The
extraction was carried out in the presence of a
buffering mixture - trisodium citrate dihydrate and
disodium citrate hemihydrate. Bondesil PSA bulk
sorbents (alkylated amine containing two amine
functional groups - secondary and primary) and C18E
(reversed-phase sorbent based on silica gel with
grafted octadecylsilane groups were used to purify the
extract from coextractable substances (fats, proteins,
sugars, organic and fatty acids, pigments and other
impurities). The degree of extraction of the analyzed
active ingredients of pesticides from the liver of fish
was 79%. The detectable pesticide concentrations
ranged from 0,4 to 0,97 mg/kg. The relative standard
deviation of the analysis results amounted to 0,01-0,14
The article is devoted to the study of enzymesantioxidants
contained in horseradish root. The article
provides a detailed analysis of the sources of information,
aimed at clarifying the content of enzymesantioxidants
contained in horseradish root, grown in
the Astrakhan region in the autumn and summer. During
the analysis of the literature, it was found that the
content of enzyme-antioxidants in the root of the
horseradish is not constant and depends on climatic
conditions, planting time and harvest time. The content
of antioxidants in the root of horseradish grown in the
Astrakhan region in the summer-autumn period was
studied using by the method of A.N. Bach and A.I.
Oparin. 2 g of horseradish roots contains the number
of enzymes - antioxidants able to expand for 30 min
(1,547 • 100) / (20 • 1) = 77.35 mg of hydrogen peroxide
in 1 min - 2.56 mg. 1mkmol As hydrogen peroxide
is 0.034 mg, in 2 g horseradish contains 76 E enzyme -
antioxidants (or E 38 1 g horseradish). The results of
this work will form the basis for the creation and study
of new enterosorbent with antioxidant functions. Enterosorbent
prepared by adsorption on starch antioxidants
such as peroxidase, catalase, and ascorbic acid,
from aqueous extracts of plant material
The new benzimidazole-functionalized graphene
material based on graphene oxide (GO) and 3,3',4,4'-
tetraaminodiphenyl oxide (TADPO) was obtained
under one-step hydrothermal synthesis conditions.
According to IR spectroscopy and elemental analysis,
as a result of the reaction, benzimidazole (BI) rings are
formed, and the mass content of nitrogen is 12.3%.
The new graphene material is characterized by
excellent electrochemical efficiency in a threeelectrode
supercapacitor. As a result of the redox
activity of BI cycles the specific capacitance reaches
286 F/g at the scan rate of 2 mV/s, which is
substantially higher than the reduced graphene oxide
(RGO) sample obtained under similar conditions
without using TADPO (159 F/g at 2 mV/s)
The article shows the information of the use of 2-R-sulfanyl nicotinates of potassium on rice crops. We have found that the compounds described increase yield and improve its quality
The present work describes the chemical synthesis of
poly-N,N-diallyl pyrrolidinium bromide and polyN,N-diallyl
morpholinium bromide - high-molecular
compounds containing quaternary nitrogen atoms,
which included in two five- and/or six-membered
heterocyclic rings. These polymers are perspective
modifiers for industrially produced anion-exchange
membranes, the use of which should significantly
improve the resistance to degradation of the
membranes at over-limiting current regimes. The
structure of obtained polymers was characterized by
FTIR, 1H and 13C NMR spectroscopy. The optimal
reaction conditions, which increase the yield of desired
products, were defined. It is shown that is preferable to
use 1-butanol as a solvent and benzoyl peroxide as an
initiator
The method of nanoemulsions obtaining with acoustic chemistry method has been considered in the article, the nanoemulsion formula has been found. The researches for emulsion stability and particle sizes determination have been fulfilled. The antioxidant effect of the obtained emulsion and a possibility to use it in meat-vegetable products have been researched