Pub Date : 2022-01-01DOI: 10.30791/1028-978x-2022-6-46-53
A. Memetova, A. Zelenin, N. Memetov, A. Babkin, A. Gerasimova
A compacted microporous carbon material (CMC-032) was obtained, which has a number of unique properties: a high specific surface area according to BET (SBET = 2384 m2/g), a large volume of micropores (~ 0.95 cm3/g), and a very high ability to retain methane 336 m3/v3. Sorbent CMC-032 is obtained by activating polymer raw materials with potassium hydroxide and compaction by hot pressing using polyvinyl alcohol as a binder. In the most demanded range of methane accumulation pressures of 3,5 – 10,0 MPa, the amount of accumulated methane in the system with CMC-032 reaches 270 m3/m3. The amount of methane stored in the system with and without CMC-032 adsorbent at 100 bar differs by about 3 times. The physicochemical properties of the obtained CMC-032 adsorbent were studied using methods including adsorption-desorption of N2 at 77 K, X-ray diffraction analysis, FTIR spectroscopy, Raman spectroscopy, and transmission electron microscopy. Based on the adsorption characteristics, it was found that CMC-032 is a promising material for storing natural gas methane. It is assumed that the high adsorption capacity is due to the high micropore volume and packing density.
{"title":"Microporous carbon material with high adsorption rates","authors":"A. Memetova, A. Zelenin, N. Memetov, A. Babkin, A. Gerasimova","doi":"10.30791/1028-978x-2022-6-46-53","DOIUrl":"https://doi.org/10.30791/1028-978x-2022-6-46-53","url":null,"abstract":"A compacted microporous carbon material (CMC-032) was obtained, which has a number of unique properties: a high specific surface area according to BET (SBET = 2384 m2/g), a large volume of micropores (~ 0.95 cm3/g), and a very high ability to retain methane 336 m3/v3. Sorbent CMC-032 is obtained by activating polymer raw materials with potassium hydroxide and compaction by hot pressing using polyvinyl alcohol as a binder. In the most demanded range of methane accumulation pressures of 3,5 – 10,0 MPa, the amount of accumulated methane in the system with CMC-032 reaches 270 m3/m3. The amount of methane stored in the system with and without CMC-032 adsorbent at 100 bar differs by about 3 times. The physicochemical properties of the obtained CMC-032 adsorbent were studied using methods including adsorption-desorption of N2 at 77 K, X-ray diffraction analysis, FTIR spectroscopy, Raman spectroscopy, and transmission electron microscopy. Based on the adsorption characteristics, it was found that CMC-032 is a promising material for storing natural gas methane. It is assumed that the high adsorption capacity is due to the high micropore volume and packing density.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90112972","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}
Pub Date : 2022-01-01DOI: 10.30791/1028-978x-2022-10-5-13
L. Rokhlin, T. Dobatkina, I. Tarytina, E. Lukyanova, O. A. Ovchinnikova
The effect of small additions of cerium-group rare-earth metals such as samarium (Sm), neodymium (Nd) and lanthanum (La) on the properties of a light high-strength structural magnesium IMV7-1 type alloy of the Mg – Y – Gd – Zr system, where yttrium (Y) and gadolinium (Gd) are yttrium-group rare earth metals, has been studied. It is established that the presence of small quantities of samarium in the IMV7-1 alloy contributes to an increase in its strength properties upon heat treatment (aging) and makes it possible to reduce the time to reach the maximum strengthening. In the case where two other cerium-group rare earth metals, neodymium and lanthanum, are present in the IMV7-1 type alloy, the strengthening upon heat treatment (aging) is also observed, but to a much lesser extent. It has also been established that, as the contents of the main alloying elements (yttrium and gadolinium) are simultaneously increased and samarium is added, the maximum strengthening of the alloys under study gradually increases, and the time to its achievement decreases. The fact that the alloying with samarium results in substantially higher strengthening of the IMV7-1 type alloy than that provided by neodymium and lanthanum is explained by a much higher solubility of samarium compared to these of neodymium and lanthanum in solid magnesium.
研究了少量添加钐(Sm)、钕(Nd)和镧(La)等铈族稀土金属对Mg - Y - Gd - Zr体系(其中钇(Y)和钆(Gd)为钇族稀土金属)轻质高强结构镁IMV7-1型合金性能的影响。结果表明，少量钐在IMV7-1合金中的存在有助于提高其热处理(时效)时的强度性能，并有可能缩短达到最大强化的时间。在IMV7-1型合金中存在另外两种铈族稀土金属(钕和镧)的情况下，也观察到热处理(时效)的强化，但程度要小得多。同时增加主要合金元素(钇和钆)的含量并加入钐，合金的最大强化强度逐渐增大，达到最大强化强度所需的时间逐渐缩短。在IMV7-1型合金中，与钕和镧合金相比，与钐合金的合金化导致了更高的强化，这一事实是由于钐在固体镁中的溶解度比钕和镧合金高得多。
{"title":"Properties of a light structural magnesium IMV7-1 type alloy of the Mg – Y – Gd – Zr system with the additions of cerium-group rare-earth metals such as samarium, neodymium, and lanthanum","authors":"L. Rokhlin, T. Dobatkina, I. Tarytina, E. Lukyanova, O. A. Ovchinnikova","doi":"10.30791/1028-978x-2022-10-5-13","DOIUrl":"https://doi.org/10.30791/1028-978x-2022-10-5-13","url":null,"abstract":"The effect of small additions of cerium-group rare-earth metals such as samarium (Sm), neodymium (Nd) and lanthanum (La) on the properties of a light high-strength structural magnesium IMV7-1 type alloy of the Mg – Y – Gd – Zr system, where yttrium (Y) and gadolinium (Gd) are yttrium-group rare earth metals, has been studied. It is established that the presence of small quantities of samarium in the IMV7-1 alloy contributes to an increase in its strength properties upon heat treatment (aging) and makes it possible to reduce the time to reach the maximum strengthening. In the case where two other cerium-group rare earth metals, neodymium and lanthanum, are present in the IMV7-1 type alloy, the strengthening upon heat treatment (aging) is also observed, but to a much lesser extent. It has also been established that, as the contents of the main alloying elements (yttrium and gadolinium) are simultaneously increased and samarium is added, the maximum strengthening of the alloys under study gradually increases, and the time to its achievement decreases. The fact that the alloying with samarium results in substantially higher strengthening of the IMV7-1 type alloy than that provided by neodymium and lanthanum is explained by a much higher solubility of samarium compared to these of neodymium and lanthanum in solid magnesium.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74416238","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}
Pub Date : 2022-01-01DOI: 10.30791/1028-978x-2022-9-12-22
E. V. Demina, N. Vinogradova, A. S. Demin, N. A. Epifanov, E. Morozov, A. Mikhailova, V. N. Pimenov, M. D. Prusakova, S. Rogozhkin, S. Shevtsov
A study of the radiation-thermal resistance of ferritic steel 16Cr – 4Al – 2W – 0.3Ti – 0.3Y2O3 was made. This ODS (oxide dispersion strengthened) steel is perspective for fusion applications. The “Vikhr” Plasma Focus installation was used to introduse of powerful pulsed flows of helium ions and helium plasma. The power density of a beam of fast helium ions and high-temperature helium plasma flows was ~ 108 and 107 W/cm2 at exposure times of ~ 50 and 100 ns, respectively. The number of pulses N varied in the range from 10 to 30. The rate of evaporation and radiaсtive sputtering changed slightly with an increase in the number of pulses of energy flows acting on the material and amounted to h ≈ 0.01 – 0.02 μm/puls. The irradiated surface after repeated melting under the action of a pulsed radiation-thermal load with powerful energy flows acquired a wave-like character with inclusions of dispersed micro particles of the second phase, containing mainly yttrium, oxygen, aluminum, iron, and titanium. At the same time, in contrast to the refractory metals (W, Mo, Ti) earlier under similar radiation conditions studied, no micro- and macro cracks were formed on the surface of the material facing the plasma. “Vikhr” Plasma Focus setup proved to be an effective tool for simulation testing of candidate materials with magnetic and inertial plasma confinement.
{"title":"Simulated irradiation of 16Cr – 4Al – 2W – 0.3Ti – 0.3Y2O3 ODS steel, perspective for thermonuclear reactors in the plasma focus facility “Vikhr”","authors":"E. V. Demina, N. Vinogradova, A. S. Demin, N. A. Epifanov, E. Morozov, A. Mikhailova, V. N. Pimenov, M. D. Prusakova, S. Rogozhkin, S. Shevtsov","doi":"10.30791/1028-978x-2022-9-12-22","DOIUrl":"https://doi.org/10.30791/1028-978x-2022-9-12-22","url":null,"abstract":"A study of the radiation-thermal resistance of ferritic steel 16Cr – 4Al – 2W – 0.3Ti – 0.3Y2O3 was made. This ODS (oxide dispersion strengthened) steel is perspective for fusion applications. The “Vikhr” Plasma Focus installation was used to introduse of powerful pulsed flows of helium ions and helium plasma. The power density of a beam of fast helium ions and high-temperature helium plasma flows was ~ 108 and 107 W/cm2 at exposure times of ~ 50 and 100 ns, respectively. The number of pulses N varied in the range from 10 to 30. The rate of evaporation and radiaсtive sputtering changed slightly with an increase in the number of pulses of energy flows acting on the material and amounted to h ≈ 0.01 – 0.02 μm/puls. The irradiated surface after repeated melting under the action of a pulsed radiation-thermal load with powerful energy flows acquired a wave-like character with inclusions of dispersed micro particles of the second phase, containing mainly yttrium, oxygen, aluminum, iron, and titanium. At the same time, in contrast to the refractory metals (W, Mo, Ti) earlier under similar radiation conditions studied, no micro- and macro cracks were formed on the surface of the material facing the plasma. “Vikhr” Plasma Focus setup proved to be an effective tool for simulation testing of candidate materials with magnetic and inertial plasma confinement.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82154961","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}
Pub Date : 2022-01-01DOI: 10.30791/1028-978x-2022-7-58-65
N. Kakhramanov, Kh. V. Allahverdieva, Y. Kakhramanly, E. V. Dadasheva
The results of a study of the effect of the various types of fillers concentration at the nanoscale level, zinc stearate, aluminum, technical carbon — on the physical and mechanical properties of nanocomposites based on polyolefins are presented. High density polyethylene, low density polyethylene and polypropylene were used as polyolefins. In order to improve the compatibility of polyolefins with fillers, a copolymer of high density polyethylene with maleic anhydride was used as a compatibilizer. The amount of maleic anhydride in the high density polyethylene was 5.7 wt %. Investigated such properties of nanocomposites as ultimate tensile stress, tensile yield strength, elongation at break, static bending strength and Vicat heat resistance. It was found that the use of a compatibilizer contributes to a significant improvement in the main physico-mechanical characteristics of nanocomposites, which indicates the technological compatibility of the mixed components of the mixture with the polymer matrix. It was found that in the presence of fillers, the elongation at break of the nanocomposites slightly decreases. It is shown that an increase in the content of technical carbon in the polymer matrix in the presence of 5.0 wt % concentration of aluminum is accompanied by an increase in the ultimate tensile stress and yield stress during stretching of nanocomposites with a maximum at a certain ratio of the mixture components. It was found that in polyolefins characterized by a relatively high degree of crystallinity, the maximum value of the ultimate tensile stress is achieved at a lower concentration of technical carbon.
{"title":"Physico-mechanical properties of multicomponent nanocomposites based on polyolefins","authors":"N. Kakhramanov, Kh. V. Allahverdieva, Y. Kakhramanly, E. V. Dadasheva","doi":"10.30791/1028-978x-2022-7-58-65","DOIUrl":"https://doi.org/10.30791/1028-978x-2022-7-58-65","url":null,"abstract":"The results of a study of the effect of the various types of fillers concentration at the nanoscale level, zinc stearate, aluminum, technical carbon — on the physical and mechanical properties of nanocomposites based on polyolefins are presented. High density polyethylene, low density polyethylene and polypropylene were used as polyolefins. In order to improve the compatibility of polyolefins with fillers, a copolymer of high density polyethylene with maleic anhydride was used as a compatibilizer. The amount of maleic anhydride in the high density polyethylene was 5.7 wt %. Investigated such properties of nanocomposites as ultimate tensile stress, tensile yield strength, elongation at break, static bending strength and Vicat heat resistance. It was found that the use of a compatibilizer contributes to a significant improvement in the main physico-mechanical characteristics of nanocomposites, which indicates the technological compatibility of the mixed components of the mixture with the polymer matrix. It was found that in the presence of fillers, the elongation at break of the nanocomposites slightly decreases. It is shown that an increase in the content of technical carbon in the polymer matrix in the presence of 5.0 wt % concentration of aluminum is accompanied by an increase in the ultimate tensile stress and yield stress during stretching of nanocomposites with a maximum at a certain ratio of the mixture components. It was found that in polyolefins characterized by a relatively high degree of crystallinity, the maximum value of the ultimate tensile stress is achieved at a lower concentration of technical carbon.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75620804","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}
Pub Date : 2022-01-01DOI: 10.30791/1028-978x-2022-11-29-35
M. A. Nuriev, A. Abdullaev, I. M. Nuruev, A. Shukurova, V. G. Mamedov
The aim of this work is to study the charge state of polymer composites based on high-density polyethylene (HDPE) with a ferroelectric semiconductor filler TlGaTe2 at a volume content of 3, 7, 10 vol.%, And the ferroelectric semiconductor TlGaTe2 itself, as well as to study the temperature dependence of their dielectric constant ε(T) and electrical conductivity ρ(T). It is shown that the introduction of the semiconductor filler TlGaTe2 into the polymer matrix of HDPE makes it possible to control the charge state of polymer composites HDPE/TlGaTe2, which can contribute to a purposeful change in the electrophysical properties of these materials.
{"title":"Charging state of polyethylene composites with TlGaTe2 semiconductor filler","authors":"M. A. Nuriev, A. Abdullaev, I. M. Nuruev, A. Shukurova, V. G. Mamedov","doi":"10.30791/1028-978x-2022-11-29-35","DOIUrl":"https://doi.org/10.30791/1028-978x-2022-11-29-35","url":null,"abstract":"The aim of this work is to study the charge state of polymer composites based on high-density polyethylene (HDPE) with a ferroelectric semiconductor filler TlGaTe2 at a volume content of 3, 7, 10 vol.%, And the ferroelectric semiconductor TlGaTe2 itself, as well as to study the temperature dependence of their dielectric constant ε(T) and electrical conductivity ρ(T). It is shown that the introduction of the semiconductor filler TlGaTe2 into the polymer matrix of HDPE makes it possible to control the charge state of polymer composites HDPE/TlGaTe2, which can contribute to a purposeful change in the electrophysical properties of these materials.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80007022","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}
Pub Date : 2022-01-01DOI: 10.30791/1028-978x-2022-3-46-54
D. D. Fazullin, L. I. Fazullina, G. Mavrin
Composite membranes nylon-AC (NAC) were obtained by immersing a nylon mesh substrate in a 5 % solution of cellulose acetate (AC) in acetone. The AC content in the membrane ranged from 21 to 45 %, depending on the number of applied surface layers. According to the results of studying the properties of composite membranes, an increase in water absorption and total porosity of membranes after the application of the first layer of AC was found, and with the application of the next layer of AC, the values of water absorption and total porosity slightly decrease, which is due to the compaction of the membrane structure. Also, a decrease in the contact angle of the membrane wetting by 33° was revealed, which means an increase in the hydrophilic properties of the membrane, which increases the wettability and productivity of the obtained membranes. Composite membranes with two and three layers of AC: NAC2 and NAC3 were used to separate 0.5 % water-oil emulsion with particle sizes from 81 to 422 nm. The specific productivity of the NAC2 membrane by 0.5 % water-oil emulsion was 9433 dm3/(m2·h), the productivity of the NAC3 membrane was 3799 dm3/(m2·h) at a pressure of 0.55 MPa, which exceeds the performance of the commercial ultrafiltration membrane UPM-100 equal to 1843 dm3/(m2·h). According to the results of the study, the retention capacity of composite membranes for oil products from a water-oil emulsion was established, which was 61 % for NAC2 membranes and 75 % for NAC3 membrane. These indicators are not inferior to the retention capacity of a commercial ultrafiltration membrane of the UPM-100 brand.
{"title":"Obtaining and properties of ultrafiltration cellulose acetate membranes on a nylon net support","authors":"D. D. Fazullin, L. I. Fazullina, G. Mavrin","doi":"10.30791/1028-978x-2022-3-46-54","DOIUrl":"https://doi.org/10.30791/1028-978x-2022-3-46-54","url":null,"abstract":"Composite membranes nylon-AC (NAC) were obtained by immersing a nylon mesh substrate in a 5 % solution of cellulose acetate (AC) in acetone. The AC content in the membrane ranged from 21 to 45 %, depending on the number of applied surface layers. According to the results of studying the properties of composite membranes, an increase in water absorption and total porosity of membranes after the application of the first layer of AC was found, and with the application of the next layer of AC, the values of water absorption and total porosity slightly decrease, which is due to the compaction of the membrane structure. Also, a decrease in the contact angle of the membrane wetting by 33° was revealed, which means an increase in the hydrophilic properties of the membrane, which increases the wettability and productivity of the obtained membranes. Composite membranes with two and three layers of AC: NAC2 and NAC3 were used to separate 0.5 % water-oil emulsion with particle sizes from 81 to 422 nm. The specific productivity of the NAC2 membrane by 0.5 % water-oil emulsion was 9433 dm3/(m2·h), the productivity of the NAC3 membrane was 3799 dm3/(m2·h) at a pressure of 0.55 MPa, which exceeds the performance of the commercial ultrafiltration membrane UPM-100 equal to 1843 dm3/(m2·h). According to the results of the study, the retention capacity of composite membranes for oil products from a water-oil emulsion was established, which was 61 % for NAC2 membranes and 75 % for NAC3 membrane. These indicators are not inferior to the retention capacity of a commercial ultrafiltration membrane of the UPM-100 brand.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90724842","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}
Pub Date : 2022-01-01DOI: 10.30791/1028-978x-2022-8-26-35
V. Zhinzhilo, K. V. Slepova, I. Uflyand
Metal-organic frameworks based on nickel and cobalt trimesinates were synthesized according to a modified procedure by the interaction of nickel acetate or cobalt nitrate and trimesic acid in the presence of alkali. They have been used to extract the organic Congo red and methylene blue dyes from their aqueous solutions. The degree of adsorption depends on temperature and reaches 97 % for Congo red, while for methylene blue it is about 83 %. The mechanisms and characteristic parameters of the adsorption process are analyzed using empirical models of the isotherms of Langmuir, Temkin, and Freundlich, of which the most optimal adsorption process is described by the Freundlich model. The calculated thermodynamic parameters indicate a spontaneous process in the case of nickel trimesinate, while for cobalt trimesinate the adsorption of Congo red is spontaneous, and the adsorption of methylene blue is a forced process.
{"title":"A mixed-ligand complex of nickel trimesinate with 1,10-phenanthroline as an adsorbent for organic dyes and a precursor of nanostructured materials","authors":"V. Zhinzhilo, K. V. Slepova, I. Uflyand","doi":"10.30791/1028-978x-2022-8-26-35","DOIUrl":"https://doi.org/10.30791/1028-978x-2022-8-26-35","url":null,"abstract":"Metal-organic frameworks based on nickel and cobalt trimesinates were synthesized according to a modified procedure by the interaction of nickel acetate or cobalt nitrate and trimesic acid in the presence of alkali. They have been used to extract the organic Congo red and methylene blue dyes from their aqueous solutions. The degree of adsorption depends on temperature and reaches 97 % for Congo red, while for methylene blue it is about 83 %. The mechanisms and characteristic parameters of the adsorption process are analyzed using empirical models of the isotherms of Langmuir, Temkin, and Freundlich, of which the most optimal adsorption process is described by the Freundlich model. The calculated thermodynamic parameters indicate a spontaneous process in the case of nickel trimesinate, while for cobalt trimesinate the adsorption of Congo red is spontaneous, and the adsorption of methylene blue is a forced process.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90570351","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}
Pub Date : 2022-01-01DOI: 10.30791/1028-978x-2022-12-12-19
T. Kon’kova, A. Rysev
Natural bentonite clay with a montmorillonite content of 98 %, modified with a solution of sodium metasilicate, has high catalytic activity in the reaction of oxidative degradation of organic azo dyes with hydrogen peroxide by the Fenton-Ruff mechanism in a neutral medium. The activity is due to the presence of iron cations contained in the structure of montmorillonite, as well as protonated silanol and aluminol groups on the surface of the edges of aluminosilicate layers, which are the acid centers of Brensted. The degree of conversion of azo dye from cinema blue with an initial concentration in a solution of 20 mg/l was 99 % in 4 – 6 minutes of contact, at room temperature. The resulting material is well filtered and can be recommended for wastewater treatment from organic substances.
{"title":"Catalyst based on bentonite clay modified with sodium metasilicate for heterogeneous Fenton-Raff type process","authors":"T. Kon’kova, A. Rysev","doi":"10.30791/1028-978x-2022-12-12-19","DOIUrl":"https://doi.org/10.30791/1028-978x-2022-12-12-19","url":null,"abstract":"Natural bentonite clay with a montmorillonite content of 98 %, modified with a solution of sodium metasilicate, has high catalytic activity in the reaction of oxidative degradation of organic azo dyes with hydrogen peroxide by the Fenton-Ruff mechanism in a neutral medium. The activity is due to the presence of iron cations contained in the structure of montmorillonite, as well as protonated silanol and aluminol groups on the surface of the edges of aluminosilicate layers, which are the acid centers of Brensted. The degree of conversion of azo dye from cinema blue with an initial concentration in a solution of 20 mg/l was 99 % in 4 – 6 minutes of contact, at room temperature. The resulting material is well filtered and can be recommended for wastewater treatment from organic substances.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77419419","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}
Pub Date : 2022-01-01DOI: 10.30791/1028-978x-2022-11-36-46
E. A. Nemets, V. A. Surguchenko, Y. Belov, A. I. Xajrullina, V. Sevastyanov
A technology fo the formation of porous tubular polymer scaffolds (PTPS) made of polycaprolactone (PCL) with the necessary physical and mechanical characteristics (Young’s modulus 5.5 ± 1.1 MPa, breaking force 10.9 ± 1.6 N and maximum elongation 477 ± 38 %) has been developed. Samples obtained by electrospinning from 2 ml of a 10 % PCL solution in dichloromethane (voltage between electrodes 25 kV, solution delivery rate 4 ml/h, distance to the collector 100 mm, rotation speed of the substrate rod 1000 rpm) showed a minimum surgical permeability of 30.4 ± 1.5 ml/(cm2·min). It is proved that the proposed bioactive coating based on heparin and platelet lysate does not affect the surface structure and physical and mechanical characteristics of the scaffold. It has been shown in vitro that samples of modified PTPS do not exhibit cytotoxicity and hemolytic activity, and improvement of hemocompatible properties occurs due to a decrease in the number and degree of activation of adhered platelets.
{"title":"Porous tubular scaffolds for tissue engineering structures of small diameter blood vessels","authors":"E. A. Nemets, V. A. Surguchenko, Y. Belov, A. I. Xajrullina, V. Sevastyanov","doi":"10.30791/1028-978x-2022-11-36-46","DOIUrl":"https://doi.org/10.30791/1028-978x-2022-11-36-46","url":null,"abstract":"A technology fo the formation of porous tubular polymer scaffolds (PTPS) made of polycaprolactone (PCL) with the necessary physical and mechanical characteristics (Young’s modulus 5.5 ± 1.1 MPa, breaking force 10.9 ± 1.6 N and maximum elongation 477 ± 38 %) has been developed. Samples obtained by electrospinning from 2 ml of a 10 % PCL solution in dichloromethane (voltage between electrodes 25 kV, solution delivery rate 4 ml/h, distance to the collector 100 mm, rotation speed of the substrate rod 1000 rpm) showed a minimum surgical permeability of 30.4 ± 1.5 ml/(cm2·min). It is proved that the proposed bioactive coating based on heparin and platelet lysate does not affect the surface structure and physical and mechanical characteristics of the scaffold. It has been shown in vitro that samples of modified PTPS do not exhibit cytotoxicity and hemolytic activity, and improvement of hemocompatible properties occurs due to a decrease in the number and degree of activation of adhered platelets.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84502561","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}
Pub Date : 2022-01-01DOI: 10.30791/1028-978x-2022-10-14-22
I. Timakov, V. Grebenev, V. Komornikov, S. Prokudin
The problem of high plasticity and fluidity of phases of acidic salts with high proton conductivity of such superproton crystals of the MmHn(AO4)(m + n)/2 · yH2O (где M = NH4, K, Rb, Cs; А = P, As, S, Se). Various methods are chosen for obtaining composite materials based on the proton conductor Cs6(SO4)3(H3PO4)4 with the formation of a three-dimensional reinforcing fabric by the volume of the material present. For the first time, the temperature dependences of the hardness and elasticity of polycrystalline Cs6(SO4)3(H3PO4)4 pressed into a pellet were measured before and after the transition to the superproton state. Composite materials with the compositions xCs6(SO4)3(H3PO4)4(1– x)teflon and xCs6(SO4)3(H3PO4)4(1 – x)[SiOR]n (where 0.95 ≥ x ≥ 0.5 wt. %). The method of X-ray phase analysis on consumption dependency Taking into account the raster electronic assessment of the calculation of income phases in the income of composite materials. It is shown that with the proportion of the reinforcing component, the conductive phase is enveloped. Conductivity of composite materials research by impedance spectroscopy.
{"title":"Composite proton electrolytes based on acid salts","authors":"I. Timakov, V. Grebenev, V. Komornikov, S. Prokudin","doi":"10.30791/1028-978x-2022-10-14-22","DOIUrl":"https://doi.org/10.30791/1028-978x-2022-10-14-22","url":null,"abstract":"The problem of high plasticity and fluidity of phases of acidic salts with high proton conductivity of such superproton crystals of the MmHn(AO4)(m + n)/2 · yH2O (где M = NH4, K, Rb, Cs; А = P, As, S, Se). Various methods are chosen for obtaining composite materials based on the proton conductor Cs6(SO4)3(H3PO4)4 with the formation of a three-dimensional reinforcing fabric by the volume of the material present. For the first time, the temperature dependences of the hardness and elasticity of polycrystalline Cs6(SO4)3(H3PO4)4 pressed into a pellet were measured before and after the transition to the superproton state. Composite materials with the compositions xCs6(SO4)3(H3PO4)4(1– x)teflon and xCs6(SO4)3(H3PO4)4(1 – x)[SiOR]n (where 0.95 ≥ x ≥ 0.5 wt. %). The method of X-ray phase analysis on consumption dependency Taking into account the raster electronic assessment of the calculation of income phases in the income of composite materials. It is shown that with the proportion of the reinforcing component, the conductive phase is enveloped. Conductivity of composite materials research by impedance spectroscopy.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82284187","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}
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