Proceedings of the National Academy of Sciences of Belarus, Chemical Series最新文献

{"title":"Phase separation and properties of glasses of the system MgO–CaO–Fe 2O3–Al2O3–В2O3–SiO2","authors":"Y. G. Pavlyukevich, L. F. Papko, M. Hundzilovich, P. S. Larionov, A. Uvarov","doi":"10.29235/1561-8331-2022-58-3-317-324","DOIUrl":"https://doi.org/10.29235/1561-8331-2022-58-3-317-324","url":null,"abstract":"The synthesis and study of model glasses of the MgO–CaO–Fe2O3–Al2O3–SiO2 system, which is the base for obtaining continuous basalt fiber, has been carried out. Systematized data on the effect of components on the glasses structure and the sequence of phase separation processes occurring during their heat treatment have been obtained. It is shown that during phase separation, crystalline phases are separated in the following sequence: magnetite–pyroxene–plagioclase with a predominance of the anorthite component. Glasses of the MgO–CaO–Fe2O3–Al2O3–SiO2 system were modified by adding B2O3, and the active role of this component in the processes of glass formation and crystallization was shown. The ratio of glass-forming and modifying components of model glasses is established, at which an increase in the strength of glasses from 110 to 180 MPa is achieved. Based on the study of the technological properties of model glasses and strength characteristics, components were determined for modifying basalt glasses in order to increase the strength of the fiber.","PeriodicalId":20798,"journal":{"name":"Proceedings of the National Academy of Sciences of Belarus, Chemical Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76340418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thin composite coatings based on gelatin with inorganic nanoparticles","authors":"D. V. Sapsaliou, G. Melnikova, T. Tolstaya, S. Chizhik","doi":"10.29235/1561-8331-2022-58-3-325-333","DOIUrl":"https://doi.org/10.29235/1561-8331-2022-58-3-325-333","url":null,"abstract":"A technique for the formation of gelatin thin films and composite coatings with silicon dioxide and zinc oxide nanoparticles by spin coating has been developed. New data of the morphology and structural characteristics of the formed gelatin and nanocomposite films were obtained by atomic force microscopy. The dependences of the roughness parameters of composite coatings on the content of silicon dioxide and zinc oxide nanoparticles in the polymer matrix are presented. It has been shown that the introduction of inorganic nanoparticles into the gelatin structure makes it possible to form nanocomposites with a rough surface. It has been established that the silicon dioxide nanoparticles incorporation leads to hydrophobization of the surface of polymer-inorganic films based on gelatin. Modification with zinc oxide nanoparticles (up to 8 mg per 1 mg of gelatin) improves the wettability of nanocomposite coatings with water.","PeriodicalId":20798,"journal":{"name":"Proceedings of the National Academy of Sciences of Belarus, Chemical Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76662903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Natural diketones as potential covalent ligands for SARS-CoV-2 proteins: an in silico docking study","authors":"Y. Faletrov, V. Staravoitava, H. Pozniak, V. Shkumatov","doi":"10.29235/1561-8331-2022-58-3-280-285","DOIUrl":"https://doi.org/10.29235/1561-8331-2022-58-3-280-285","url":null,"abstract":"Our computer-aided protein-ligand docking test using Autodock Vina software allowed to reveal the potential of few α- and β-diketones from plants and alternative living organisms as covalent ligands for few proteins of coronavirus SARS-CoV-2 – a causative agent of COVID-19. It has been established that values for energy of binding (docking score, Ebind, kcal/mol) less than –7.5 and for distances of ligands’ carbonyl groups to side chain nitrogens of arginine residues of some coronaviral enzymes within 0.4 nm have been true for β-diketones 6-gingerdione (Pubchem code CID162952), 8-gingerdione (CID14440537), tetrahydrocurcumine (CID124072) as well as α-diketone wallitaxane E (CID132967478). The in silico revealed interactions are interesting to be verified in vitro and they point out a possibility of investigation of the compounds and related natural materials as tools for struggle against coronaviral infections.","PeriodicalId":20798,"journal":{"name":"Proceedings of the National Academy of Sciences of Belarus, Chemical Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83436023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis and properties of new strongly basic fibrous anion exchangers","authors":"A. Shunkevich, A. Polikarpov, G. V. Medyak, S. D. Filippovich, Z. I. Akulich","doi":"10.29235/1561-8331-2022-58-3-286-293","DOIUrl":"https://doi.org/10.29235/1561-8331-2022-58-3-286-293","url":null,"abstract":"A synthesis method of new fibrous anion exchangers with strong base groups has been developed. The synthesis was carried out by alkylation of weakly basic anion exchangers based on polyacrylonitrile fiber using two alkylating agents: epichlorohydrin and ethylene chlorohydrin. The influence of the reaction conditions on the physicochemical properties of new anion exchangers was investigated. The synthesis parameters were determined: the molar ratio of “amino groups: alkylating agent”, the concentration of the alkylating agent, the reaction time and temperature – to obtain anion exchangers with maximum exchange capacity for strong base groups. New strongly basic fibers possess satisfactory mechanical properties allowing their processing into various textile forms.","PeriodicalId":20798,"journal":{"name":"Proceedings of the National Academy of Sciences of Belarus, Chemical Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85580311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adsorption and flocculation properties of modified polyacrylamide in water dispersions of kaolin","authors":"P. Vorobiev, N. Krutko, D. V. Cherednichenko, E. Vorobieva, S. V. Bucha, Yu. V. Lipai","doi":"10.29235/1561-8331-2022-58-3-273-279","DOIUrl":"https://doi.org/10.29235/1561-8331-2022-58-3-273-279","url":null,"abstract":"A cationic flocculant with an amide-type polymer matrix was synthesized by modifying polyacrylamide according to the Mannich reaction. The use of a modified polymer leads to an increase in the adsorption of the polymer on solid phase particles in an aqueous dispersion of kaolin, an increase in the rate of kaolin sedimentation by a factor of 1.2–1.4, and makes it possible to expand the concentration range of dispersion destabilization compared to polyacrylamide.","PeriodicalId":20798,"journal":{"name":"Proceedings of the National Academy of Sciences of Belarus, Chemical Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86144443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Features of modification of polyaminoamides with rosin-maleic adducts","authors":"Y. V. Borkina, V. Fleisher, Z. Shashok","doi":"10.29235/1561-8331-2022-58-3-294-301","DOIUrl":"https://doi.org/10.29235/1561-8331-2022-58-3-294-301","url":null,"abstract":"The features of the process of chemical modification of polyaminoamides based on adipic acid and diethylenetriamine with rosin-maleic adducts differing in the content of maleopimaric acid (8.55; 16.46 and 31.12 % wt.) are considered. Modification of polyaminoamides with rosin-maleic adducts in the amount equal to the number of secondary amino groups in the repeating unit of the polymer was carried out in the melt at temperature 160–180 °C for 3 h under continuous stirring. The process was controlled by monitoring the change in the acid and amine numbers of the reaction mass. The most intensive modification of polyaminoamides by rosin-maleic adducts with different content of maleopimaric acid occurs within 1 h. It has been established that the rosin-maleic adduct with the 16.46 % wt. content of maleopimaric acid reacts with polyaminoamides and the degree of polymer modification reaches 57.39 %. The structure of the synthesized products was studied by IR-spectroscopy. The studied physicochemical properties (solubility, softening point, viscosity of solutions, acid and amine numbers, etc.) of the obtained products indicate that the reaction products are complex mixtures that consist of chemically modified polyaminoamides, N-substituted maleopimaric acid imides and unreacted rosin-maleic adducts (free resin and maleopimaric acids).","PeriodicalId":20798,"journal":{"name":"Proceedings of the National Academy of Sciences of Belarus, Chemical Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78091463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Formation of octacalcium phosphate in the interaction of calcium carbonate and monocalcium phosphate monohydrate under galvanostatic conditions","authors":"V. Krut’ko, A. E. Doroshenko, O. Musskaya, S. M. Rabchynski, A. Kulak","doi":"10.29235/1561-8331-2022-58-3-263-272","DOIUrl":"https://doi.org/10.29235/1561-8331-2022-58-3-263-272","url":null,"abstract":"The calcium phosphate composite octacalcium phosphate / calcite was obtained at pH 5–7 from the CaCO3/Ca(H2PO4)2 aqueous suspension in a galvanostatic mode at a current density of 20 mA/cm2 for 20 min. Drying at 80 °C without the precipitate maturation stage led to a powder formation consisting of brushite, calcite and a small amount of octacalcium phosphate. Prolonged maturation in air for 2 months led to the hydrolytic transformation of brushite into octacalcium phosphate stabilized by calcite. The use of electric current made it possible to increase the amount of octacalcium phosphate in the composite powder with the morphology of lamellar rosettes. Calcination at 800 °C of the composite powders led to the formation of α/β-tricalcium phosphate, β-calcium pyrophosphate, hydroxyapatite, and calcium oxide.","PeriodicalId":20798,"journal":{"name":"Proceedings of the National Academy of Sciences of Belarus, Chemical Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84118672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Features of the coagulating and peptizing action of weakly basic and strongly basic cationic polyelectrolytes on rosin emulsions","authors":"N. Chornaya, O. Misyurov, S. A. Dashkevich","doi":"10.29235/1561-8331-2022-58-3-302-316","DOIUrl":"https://doi.org/10.29235/1561-8331-2022-58-3-302-316","url":null,"abstract":"It has been shown for the first time that cationic polyelectrolytes (weakly basic (polyamide-polyamine-epichlorohydrin resin (PPER)) and strongly basic (polydimethyldiallylammonium chloride (PDMDAAC) and copolymer of acrylamide with methylene chloride dimethylamminopropylacrylamide (CA MC DMAPA)), widely used in paper and cardboard technology as flocculants (existing technology), additionally participate in the processes of coagulation and peptization (proposed technology). It has been established that the coagulating ability of polyelectrolytes decreases in the series CA MC DMAPA > PDMDAAC > PPER, while the peptizing ability, on the contrary, increases. Peptizable coagulants with the size and ξ-potential that do not exceed 5200 nm and +15 mV, respectively, are formed in the presence of PPER, when its content in the dispersed system does not exceed 0.15 parts by weight / parts by weight of the dispersed phase of the rosin emulsion (RE). The first region of electrolytic coagulation RE (proposed technology) corresponds to the ratio of RE : electrolyte in the range from 1: 0.3 to 1: 0.6, while with an increased content of electrolyte in the dispersed system (existing technology), which is in the range of 1: 2.4 to 1: 3.0 , the coagulation process proceeds in the second region (the resulting coagulates are electrically neutral and coarse (size exceeds 5200 nm) and are not able to peptize). The peptization process proceeds in the dispersed system “RE (1.0 wt. parts) – PPER (0.04 wt. parts) – electrolyte (0.6 wt. parts)”. The presence of PPER promotes an increase in the ξ-potential of peptized particles from +35 to +50 mV. Unlike coagulates, such particles provide a shift in the sizing process from the traditional mode of homocoagulation to a more efficient mode of heteroadagulation. This results in an increase in the hydrophobicity and strength of paper (cardboard) by 29–36 and 28–38 %, respectively, as well as in an improvement in the printing properties of coated products by 12–15 %.","PeriodicalId":20798,"journal":{"name":"Proceedings of the National Academy of Sciences of Belarus, Chemical Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90527378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatiotemporal variability of formaldehyde content in atmospheric air according to satellite measurements","authors":"Yu. G. Kokosh, S. Kakareka","doi":"10.29235/1561-8331-2022-58-3-334-344","DOIUrl":"https://doi.org/10.29235/1561-8331-2022-58-3-334-344","url":null,"abstract":"Formaldehyde (HCHO) is a key ingredient in atmospheric chemistry, a precursor to ozone (O3) and an important indicator of atmospheric photochemical activity. It is also known to be a human and animal carcinogen. To assess the spatial and temporal variability of the formaldehyde content, the article analyzes long-term data (2003–2016) of measurements of the OMI spectrometer located on the Aura satellite. The results of the analysis showed that the tropospheric content of formaldehyde over most of the territory of Belarus for 2003–2016 had an uneven spatial distribution: there is a decrease in concentrations in the direction from the southwest to the northeast. Large cities and industrial centers form zones of increased troposphere pollution. The content of formaldehyde in the cells over the territory of Belarus during the study period was in the range of up to 30.8×1015 mol/cm2 and averaged 6.5×1015 molec./cm2. In most of the obtained values (84.1 %), the formaldehyde concentrations were fixed within the range of 2.0–10.0×1015 molec./cm2, and only 0.6 % exceeded 15.0×1015 molec./cm2. The obtained data are compared with the data of the ground-based atmospheric air monitoring system. The content of formaldehyde in the troposphere over the territory of Belarus, as well as in the surface layer of the atmosphere, has a pronounced seasonal dynamics with a maximum in the warm season with the highest concentrations in July and August. An analysis of the intra-annual dynamics of formaldehyde content in the surface layer and in the troposphere column indicates the presence of general trends, both for Belarus as a whole and for individual cities.1","PeriodicalId":20798,"journal":{"name":"Proceedings of the National Academy of Sciences of Belarus, Chemical Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91296626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fabrication of microstructured poly(3-hydroxybutyrate) films with controlled surface topography","authors":"V. Kulikouskaya, V. Nikalaichuk, A. Bonartsev, I. Chyshankou, E. Akoulina, I. Demianova, G. A. Bonartseva, К. S. Hileuskaya, V. Voinova","doi":"10.29235/1561-8331-2022-58-2-135-148","DOIUrl":"https://doi.org/10.29235/1561-8331-2022-58-2-135-148","url":null,"abstract":"The possibility of fabrication of microstructured poly-3-hydroxybutyrate films by self-assembly water microdroplets technique, using artificial templates and polymer inverse emulsions has been studied. It has been established that self-assembly water microdroplets technique allows forming ordered microstructures of poly-3-hydroxybutyrate with a hexagonal arrangement of cells with an adjustable diameter from 1 to 4 цт. It has been shown that application of inverse emulsions of poly-3-hydroxybutyrate allows us to fabricate porous films with a pore size in the range from 0.4 to 3 ^m, while the structure of the films and the pore size can be controlled by changing the polymer concentration in the dispersion medium and the volume ratio of the phases. Using spin-coating technique and artificial templates, it is possible to obtain poly-3-hydroxybutyrate microstructured replicas, which are characterized by a high degree of uniformity and the absence of defective areas. It has been shown that the formed microstructured poly-3-hydroxybutyrate films with controlled surface topography are promising for use as scaffolds for stem cells.","PeriodicalId":20798,"journal":{"name":"Proceedings of the National Academy of Sciences of Belarus, Chemical Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86658291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}