Nanotechnologies in Russia最新文献_第8页

Obtaining and Studying the Antioxidant Activity and Hepatoprotective Effect of a Polymer Composition Containing Silybin 获得并研究含水飞蓟宾的聚合物组合物的抗氧化活性和保肝效果

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Nanotechnologies in Russia Pub Date : 2024-03-23 DOI: 10.1134/S263516762360061X

S. L. Kuznetsov, N. V. Gukasova, I. A. Tubasheva, V. V. Zavarzina, S. V. Aleshin, A. I. Muraveva, A. A. Lapin, V. N. Zelenkov, Yu. I. Poltavets

{"title":"Obtaining and Studying the Antioxidant Activity and Hepatoprotective Effect of a Polymer Composition Containing Silybin","authors":"S. L. Kuznetsov, N. V. Gukasova, I. A. Tubasheva, V. V. Zavarzina, S. V. Aleshin, A. I. Muraveva, A. A. Lapin, V. N. Zelenkov, Yu. I. Poltavets","doi":"10.1134/S263516762360061X","DOIUrl":"10.1134/S263516762360061X","url":null,"abstract":"Preparations based on silybin are used as hepatoprotectors in the treatment of liver lesions of various etiologies. The main disadvantage limiting their use is low bioavailability associated with the low solubility of silybin in water. To solve this problem, numerous delivery systems are created that increase its solubility, including those based on biodegradable polymers. This study presents a method for producing a polymer composition containing silybin (PCS) based on copolymers of lactic and glycolic acids. The content of the active ingredient in the product is 5%, its entrapment efficiency in particles is more than 90%; the Z-average particle size in an aqueous suspension is about 200 nm, the polydispersity index is less than 0.2, and the zeta potential is from ‒1 to ‒5 mV. The high antioxidant activity of silybin in the polymer composition by galvanostatic coulometry, as well as in the reaction of the nonenzymatic autoxidation of adrenaline, is shown. In an in vivo study on a model of acute toxic hepatitis induced by carbon tetrachloride, the more pronounced hepatoprotective effect of PCS is found compared with free silybin.","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":"18 2 supplement","pages":"S407 - S415"},"PeriodicalIF":0.8,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140884052","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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Magnetization of Amorphous Microwire Systems: FORC Analysis 非晶微线系统的磁化：FORC 分析

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Nanotechnologies in Russia Pub Date : 2024-03-23 DOI: 10.1134/S2635167623601341

A. S. Komlev, N. S. Perov, L. A. Shendrikova

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The Research and Development of the Titanium Nitrides TiNx Sublayer, Formed on the Surface of the Anodic Porous Transport Layer of PEM Water Electrolyzer 在 PEM 水电解槽阳极多孔传输层表面形成的氮化钛 TiNx 子层的研究与开发

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Nanotechnologies in Russia Pub Date : 2024-03-23 DOI: 10.1134/S2635167624600123

S. I. Butrim, M. A. Solovyev, I. V. Pushkareva, V. V. Tishkin, D. A. Simkin, B. L. Shapir, M. V. Kozlova, O. K. Alekseeva, E. V. Kukueva, A. S. Pushkarev, V. N. Fateev

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Synthesis and Properties of Nanocomposites Based on Iron(III) Salts of Saturated Monocarboxylic Acids 基于饱和单羧酸铁（III）盐的纳米复合材料的合成与性能

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Nanotechnologies in Russia Pub Date : 2024-03-23 DOI: 10.1134/S2635167623601572

S. A. Semenov, R. V. Saprykin, G. I. Dzhardimalieva, K. V. Pokholok, M. C. Balashov, A. I. Ivanova, V. I. Popenko

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Compact Model for Describing the Plasticity of Memristors Based on Nanolayers of LiNbO3 and (Co–Fe–B)х(LiNbO3)100–х Composite According to the Biosimilar STDP Rule 根据生物类似物 STDP 规则描述基于铌酸锂纳米层和（Co-Fe-B）х（铌酸锂）100-х 复合材料的可塑性晶闸管的紧凑模型

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Nanotechnologies in Russia Pub Date : 2024-03-23 DOI: 10.1134/S2635167623601535

A. V. Emelyanov, K. E. Nikiruy, A. I. Iliasov, E. A. Tsyvkunova, I. A. Surazhevsky, V. A. Demin, Y. Lin, Y. Tao, V. V. Rylkov

{"title":"Compact Model for Describing the Plasticity of Memristors Based on Nanolayers of LiNbO3 and (Co–Fe–B)х(LiNbO3)100–х Composite According to the Biosimilar STDP Rule","authors":"A. V. Emelyanov, K. E. Nikiruy, A. I. Iliasov, E. A. Tsyvkunova, I. A. Surazhevsky, V. A. Demin, Y. Lin, Y. Tao, V. V. Rylkov","doi":"10.1134/S2635167623601535","DOIUrl":"10.1134/S2635167623601535","url":null,"abstract":"<div>А compact phenomenological model is proposed to describe the plasticity of memristive structures based on nanolayers of LiNbO3 and (Co–Fe–B)x(LiNbO3)100–x composite, taking into account the features of resistive switching of the structures and hopping electron transport in amorphous LiNbO3. The model well describes the current–voltage characteristics of memristors in a crossbar array, and the effective microscopic parameters found in the fitting of the current—voltage characteristics make it possible to predict the result of changes in the conductivity according to spike-timing-dependent plasticity (STDP), and in addition, the dependence of the STDP window on the initial conductivity of the memristor. The results obtained can be used in the development of algorithms for training spiking neuromorphic computing systems and identifying memristive STDP, which is effective for their implementation.</div>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":"18 2 supplement","pages":"S421 - S426"},"PeriodicalIF":0.8,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140884393","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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Hydrogels Based on Gellan and a Graft Copolymer of Pullulan with Poly(2-methyl-2-oxazoline) Side Groups 基于结冷胶和普鲁兰与聚(2-甲基-2-噁唑啉)侧基的接枝共聚物的水凝胶

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Nanotechnologies in Russia Pub Date : 2024-03-23 DOI: 10.1134/S2635167623601481

A. A. Lezov, V. B. Rogozhin, A. A. Lezova, N. G. Mikusheva, I. Yu. Perevyazko, G. E. Polushina, A. S. Gubarev, I. M. Zorin, N. V. Tsvetkov

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Probe Microscopy in the Investigation of Ni/Cu and FeNi Magnetic Nanowires 探针显微镜在镍/铜和铁镍磁纳米线研究中的应用

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Nanotechnologies in Russia Pub Date : 2024-03-23 DOI: 10.1134/S263516762360150X

D. A. Bizyaev, D. L. Zagorskiy, D. R. Khairetdinova

{"title":"Probe Microscopy in the Investigation of Ni/Cu and FeNi Magnetic Nanowires","authors":"D. A. Bizyaev, D. L. Zagorskiy, D. R. Khairetdinova","doi":"10.1134/S263516762360150X","DOIUrl":"10.1134/S263516762360150X","url":null,"abstract":"<div>Тhe work is devoted to studying the magnetic properties of one-dimensional nanostructures: nanowires (NWs). Two types of NWs are obtained by matrix synthesis and studied by probe microscopy. The combination of probe-microscopy modes makes it possible to determine the topography of the nanocrystals and the nature of their magnetization. The change in the magnetization during the application of an external magnetic field (varying in magnitude and direction) is investigated. It is shown that magnetization reversal in an external magnetic field depends on the relative position of the nanowire. Samples of the first type are Ni/Cu layered NWs: their magnetization reversal in an external magnetic field is studied and the magnitude of this field is determined. It is shown that the latter depends on the relative position and interaction of NWs with each other. For a single NW this is 4–5 mT, and for double NWs it is noticeably higher (12–15 mT). An agglomerate consisting of several interacting NWs is undergoes magnetization reversal in stages. The second type of samples are arrays of homogeneous NWs made of FeNi alloy located directly in the growth matrix. The field of magnetization reversal of isolated NWs in all cases is 7–14 mT. On the contrary, in groups of closely located NWs, the switching of magnetization occurs in stages. In this case, the range of switching fields depends on the density of NWs in the matrix and, in general, is much broader than for isolated NWs. In general, it is shown that the magnetic properties of NWs change significantly as the distance between them decreases: their magnetization reversal becomes more difficult, and various intermediate states appear, including those with opposite (antiferromagnetic) magnetization in neighboring NWs.</div>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":"18 2 supplement","pages":"S325 - S334"},"PeriodicalIF":0.8,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140884054","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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Effect of Preparation Conditions on Properties of Pt–Re Catalysts Supported on Ceria–Zirconia in Water Gas Shift Reaction (WGSR) 制备条件对水煤气变换反应 (WGSR) 中以铈-氧化锆为载体的铂-铼催化剂性能的影响

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Nanotechnologies in Russia Pub Date : 2024-03-23 DOI: 10.1134/S263516762460010X

A. M. Gorlova, V. N. Rogozhnikov, A. A. Pechenkin, I. E. Nikulina, D. I. Potemkin

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Strain-Sensitive Properties of Polymer Nanocomposites Based on Island Films 基于岛状薄膜的聚合物纳米复合材料的应变敏感特性

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Nanotechnologies in Russia Pub Date : 2024-03-23 DOI: 10.1134/S2635167623601389

A. E. Varfolomeev

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Investigation of the Degradation of the Membrane Electrode Assembly for a Proton Exchange Membrane Water Electrolyzer by Accelerated Stress Tests 通过加速应力测试研究质子交换膜水电解槽膜电极组件的退化情况

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Nanotechnologies in Russia Pub Date : 2024-03-23 DOI: 10.1134/S2635167624600135

M. V. Kozlova, I. V. Pushkareva, S. I. Butrim, M. A. Solovyev, D. A. Simkin, S. A. Grigoriev, A. S. Pushkarev

{"title":"Investigation of the Degradation of the Membrane Electrode Assembly for a Proton Exchange Membrane Water Electrolyzer by Accelerated Stress Tests","authors":"M. V. Kozlova, I. V. Pushkareva, S. I. Butrim, M. A. Solovyev, D. A. Simkin, S. A. Grigoriev, A. S. Pushkarev","doi":"10.1134/S2635167624600135","DOIUrl":"10.1134/S2635167624600135","url":null,"abstract":"Proton exchange membrane (PEM) water electrolysis allows the production of green hydrogen using renewable but unstable energy sources such as wind or solar power. The lifetime assessment of a PEM water electrolyzer and its components require lengthy and costly testing, so there is a need for the development and application of accelerated stress-testing methods, which allow the accelerated investigation of degradation processes occurring under realistic operating conditions. In this study, the dynamic cycling and constant operation of the membrane electrode assembly of a PEM water electrolyzer at elevated voltages are considered as two methods of accelerated stress testing. The degradation depth, its distribution, and mechanisms are studied using electrochemical impedance spectroscopy, polarization curve breakdown into voltage losses components, and scanning electron microscopy. The greatest depth of degradation (up to 133 mV) is achieved during continuous operation of the membrane electrode assembly at elevated voltage, due to the anode porous transport layer (PTL) surface passivation and slow oxygen transport in its porous structure. The degradation depth of the membrane electrode assembly after dynamic cycling is found to be significantly lower (7–20 mV), and is related to degradation of the catalyst layer, with the decrease of mass transport losses being significantly responsible for the decrease in the overall degradation rate observed at high current densities. The influence of the anode catalyst loading reducing and the Ti-hydride protective coating on the surface of the anode PTL on the degradation of the PEM water electrolyzer is also considered. The use of a protective coating on the surface of the PTL provides the formation of a compact anode catalyst layer with a developed interface between the catalyst layer and PTL even at the reduced anode catalyst loading.","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":"18 2 supplement","pages":"S375 - S388"},"PeriodicalIF":0.8,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140884055","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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