Pub Date : 2024-02-08DOI: 10.1134/s263516762360102x
A. A. Shumakova, A. I. Kolobanov, V. A. Shipelin, I. V. Gmoshinski, S. A. Khotimchenko
Abstract
The effect of nickel nanoparticles (NiNPs) on the bioaccumulation of essential and toxic chemical elements in the organs of rats after oral administration is evaluated. Wistar rats receive Ni in the form of a soluble salt (basic Ni carbonate) or two types of NiNPs with average diameters of 53.7 and 70.9 nm in doses of 0.1, 1.0, and 10 mg/kg body weight in terms of nickel for 92 days in the composition of the diet consumed. The content of Ni as well as Ag, Al, As, B, Ba, Be, Ca, Cd, Ce, Co, Cr, Cs, Cu, Fe, Ga, Gd, K, La, Mg, Mn, Na, Pb, Rb, Se, Sr, Tl, V, and Zn is determined in the liver, kidneys, and spleen by inductively coupled plasma mass spectrometry. The content of Ni in the kidneys and brain increases under the influence of both the salt and NPs; in the liver and gonads, only after the introduction of the salt form, but not with NPs; in the spleen the level of Ni does not increase upon the intake of all Ni forms. In rats receiving NiNPs various changes are observed in indicators of trace-element homeostasis, including the increased bioaccumulation of Pb in the liver, gonads, and brain, As in the spleen, and Al in the liver and brain; inhibition of the accumulation of Mg, Mn, and Sr in the kidney and Ba in the kidneys and spleen. The content of Ca under the influence of NPs increased in the kidneys, but decreased in the gonads. A number of effects arising from the administration of Ni in the nanoform to animals are absent or have the opposite sign in the case of salt-form administration. NiNPs have little effect on the bioaccumulation of Cu, Fe, Zn, Se, Mg, and K. The effects demonstrated by the administration of NiNPs to animals can be considered as manifestations of nanometallomic patterns, i.e., processes mediated by changes in the gene expression of metalloproteins caused by NPs or products of their biological transformation.
{"title":"Effect of Orally Introduced Nickel Nanoparticles on the Trace Element Content in the Internal Organs of Rats","authors":"A. A. Shumakova, A. I. Kolobanov, V. A. Shipelin, I. V. Gmoshinski, S. A. Khotimchenko","doi":"10.1134/s263516762360102x","DOIUrl":"https://doi.org/10.1134/s263516762360102x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The effect of nickel nanoparticles (NiNPs) on the bioaccumulation of essential and toxic chemical elements in the organs of rats after oral administration is evaluated. Wistar rats receive Ni in the form of a soluble salt (basic Ni carbonate) or two types of NiNPs with average diameters of 53.7 and 70.9 nm in doses of 0.1, 1.0, and 10 mg/kg body weight in terms of nickel for 92 days in the composition of the diet consumed. The content of Ni as well as Ag, Al, As, B, Ba, Be, Ca, Cd, Ce, Co, Cr, Cs, Cu, Fe, Ga, Gd, K, La, Mg, Mn, Na, Pb, Rb, Se, Sr, Tl, V, and Zn is determined in the liver, kidneys, and spleen by inductively coupled plasma mass spectrometry. The content of Ni in the kidneys and brain increases under the influence of both the salt and NPs; in the liver and gonads, only after the introduction of the salt form, but not with NPs; in the spleen the level of Ni does not increase upon the intake of all Ni forms. In rats receiving NiNPs various changes are observed in indicators of trace-element homeostasis, including the increased bioaccumulation of Pb in the liver, gonads, and brain, As in the spleen, and Al in the liver and brain; inhibition of the accumulation of Mg, Mn, and Sr in the kidney and Ba in the kidneys and spleen. The content of Ca under the influence of NPs increased in the kidneys, but decreased in the gonads. A number of effects arising from the administration of Ni in the nanoform to animals are absent or have the opposite sign in the case of salt-form administration. NiNPs have little effect on the bioaccumulation of Cu, Fe, Zn, Se, Mg, and K. The effects demonstrated by the administration of NiNPs to animals can be considered as manifestations of nanometallomic patterns, i.e., processes mediated by changes in the gene expression of metalloproteins caused by NPs or products of their biological transformation.</p>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139757262","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 : 2024-02-08DOI: 10.1134/s2635167623600268
A. K. Akhmedov, A. Sh. Asvarov, A. E. Muslimov, V. M. Kanevsky
Abstract
A comparative study of the growth process of transparent conductive films based on Ga-doped ZnO is carried out during the magnetron sputtering of a traditional ZnO:Ga ceramic target and ZnO:Ga–Zn composite targets with a Zn metal phase content of 10 to 30 wt %. The influence of the composition of composite targets and substrate temperature on the functional characteristics and microstructure of transparent conductive films is studied. It is demonstrated that an increase in the zinc content in the composition of the composite target when the substrate is heated to 200°C and above helps to improve the structural perfection of ZnO:Ga films and reduce their resistivity due to an increase in the concentration of charge carriers against the background of a high value of Hall mobility. All ZnO:Ga films obtained by sputtering composite targets at a substrate temperature of 200°C and above demonstrate high optical transmittance in the visible region.
{"title":"Obtaining ZnO-based Transparent Conductive Films with Improved Functional Properties","authors":"A. K. Akhmedov, A. Sh. Asvarov, A. E. Muslimov, V. M. Kanevsky","doi":"10.1134/s2635167623600268","DOIUrl":"https://doi.org/10.1134/s2635167623600268","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A comparative study of the growth process of transparent conductive films based on Ga-doped ZnO is carried out during the magnetron sputtering of a traditional ZnO:Ga ceramic target and ZnO:Ga–Zn composite targets with a Zn metal phase content of 10 to 30 wt %. The influence of the composition of composite targets and substrate temperature on the functional characteristics and microstructure of transparent conductive films is studied. It is demonstrated that an increase in the zinc content in the composition of the composite target when the substrate is heated to 200°C and above helps to improve the structural perfection of ZnO:Ga films and reduce their resistivity due to an increase in the concentration of charge carriers against the background of a high value of Hall mobility. All ZnO:Ga films obtained by sputtering composite targets at a substrate temperature of 200°C and above demonstrate high optical transmittance in the visible region.</p>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139757011","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 : 2024-02-08DOI: 10.1134/s2635167623601043
M. A. Slyusarenko, N. P. Yevlampieva, O. S. Vezo, A. V. Malek
Abstract
It is shown that the two-phase polymer system “polyethylene glycol–dextran” can be used with high efficiency for isolating nanoscale vesicles from human blood plasma, and a corresponding methodology is developed. The optimal parameters of the system for this purpose are determined: molecular weight of polymers, their weight ratio, operating temperature. The mechanism of interaction between the components of the polymer system and plasma components is also studied. It is established that the release of vesicles in a given size range is due to the choice of the composition of the polymer system in the region below its binodal and compliance with a certain quantitative ratio of the hydrodynamic volumes of dextran and polyethylene-glycol molecules in the plasma. The proposed method is an inexpensive and convenient way to concentrate vesicles for their subsequent biochemical analysis.
{"title":"On the Polymer System “PEG–Dextran” for Isolating Nanoscale Extracellular Vesicles","authors":"M. A. Slyusarenko, N. P. Yevlampieva, O. S. Vezo, A. V. Malek","doi":"10.1134/s2635167623601043","DOIUrl":"https://doi.org/10.1134/s2635167623601043","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>It is shown that the two-phase polymer system “polyethylene glycol–dextran” can be used with high efficiency for isolating nanoscale vesicles from human blood plasma, and a corresponding methodology is developed. The optimal parameters of the system for this purpose are determined: molecular weight of polymers, their weight ratio, operating temperature. The mechanism of interaction between the components of the polymer system and plasma components is also studied. It is established that the release of vesicles in a given size range is due to the choice of the composition of the polymer system in the region below its binodal and compliance with a certain quantitative ratio of the hydrodynamic volumes of dextran and polyethylene-glycol molecules in the plasma. The proposed method is an inexpensive and convenient way to concentrate vesicles for their subsequent biochemical analysis.</p>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139757209","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 : 2024-02-08DOI: 10.1134/s2635167623600487
M. V. Il’ina, O. I. Soboleva, M. R. Polyvianova, S. A. Khubezhov, O. I. Il’in
Abstract
The results of experimental studies of the influence of the ratio of process-gas flows of acetylene and ammonia on the value of the piezoelectric strain coefficient of nitrogen-doped carbon nanotubes (N‑CNTs) are presented. It is found that the value of the piezoelectric strain coefficient of N-CNTs increases from 10.9 to 20.6 pm/V when the flow ratio increases from 1 : 1 to 1 : 6, and then decreases to 18.4 pm/V when the ratio increases to 1 : 10. It is shown that this nonlinear dependence is caused by a simultaneous change in the concentration of the nitrogen dopant and the geometric parameters of the nanotube. The obtained results can be used in the development of energy-efficient piezoelectric nanogenerators based on N-CNTs.
{"title":"Study of the Piezoelectric Properties of Nitrogen-Doped Carbon Nanotubes for the Development of Energy-Efficient Nanogenerators","authors":"M. V. Il’ina, O. I. Soboleva, M. R. Polyvianova, S. A. Khubezhov, O. I. Il’in","doi":"10.1134/s2635167623600487","DOIUrl":"https://doi.org/10.1134/s2635167623600487","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The results of experimental studies of the influence of the ratio of process-gas flows of acetylene and ammonia on the value of the piezoelectric strain coefficient of nitrogen-doped carbon nanotubes (N‑CNTs) are presented. It is found that the value of the piezoelectric strain coefficient of N-CNTs increases from 10.9 to 20.6 pm/V when the flow ratio increases from 1 : 1 to 1 : 6, and then decreases to 18.4 pm/V when the ratio increases to 1 : 10. It is shown that this nonlinear dependence is caused by a simultaneous change in the concentration of the nitrogen dopant and the geometric parameters of the nanotube. The obtained results can be used in the development of energy-efficient piezoelectric nanogenerators based on N-CNTs.</p>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139757263","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 : 2024-02-08DOI: 10.1134/s2635167623600657
A. S. Dmitriev, A. A. Zhukov, I. A. Mikhailova
Abstract
We analyze efficient power supply systems for inspection microrobots designed to inspect and repair damage, and replace humans in performing difficult or dangerous tasks. Analysis based on modern methods of estimation and calculation of the efficiency of power systems shows that various power sources for microrobots may include supercapacitors, batteries, and other power architectures. The most efficient energy storage systems use thermophotovoltaics or phase-change materials for energy conversion. It is shown that graphene-based phase change nanocomposites may be efficient devices for solar thermal-energy storage for microrobots. The incorporation of graphene nanoparticles may act as thermal keys to drive the locomotion of microrobots on surfaces. In swarm robotics, this opens up new opportunities for supplying energy to multiple microrobots used in various applications.
{"title":"Comparative Analysis of the Efficient Energy Supply of Microrobots Based on Graphene Phase-Change Materials","authors":"A. S. Dmitriev, A. A. Zhukov, I. A. Mikhailova","doi":"10.1134/s2635167623600657","DOIUrl":"https://doi.org/10.1134/s2635167623600657","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>We analyze efficient power supply systems for inspection microrobots designed to inspect and repair damage, and replace humans in performing difficult or dangerous tasks. Analysis based on modern methods of estimation and calculation of the efficiency of power systems shows that various power sources for microrobots may include supercapacitors, batteries, and other power architectures. The most efficient energy storage systems use thermophotovoltaics or phase-change materials for energy conversion. It is shown that graphene-based phase change nanocomposites may be efficient devices for solar thermal-energy storage for microrobots. The incorporation of graphene nanoparticles may act as thermal keys to drive the locomotion of microrobots on surfaces. In swarm robotics, this opens up new opportunities for supplying energy to multiple microrobots used in various applications.</p>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139757013","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 : 2024-02-08DOI: 10.1134/s2635167623600542
S. V. Zabotnov, P. K. Kashkarov, A. V. Kolobov, S. A. Kozyukhin
Abstract
Chalcogenide vitreous semiconductors (ChVSs) are of both fundamental and applied interest as materials in which reversible structural transformations within the amorphous phase and phase transitions to the crystalline state can be effectively implemented and various microstructures and nanostructures can be obtained as a result of external effects. One of the most promising methods for such ChVS modifications is the pulsed-laser-irradiation technique, which is a noncontact technology of local impact and makes it possible to change the structural, optical, and electrical properties of samples in a wide range. This includes methods based on the precision formation of a surface microrelief and nanorelief, and high contrast in the conductivity and refractive index between the crystalline and amorphous phases. This work reviews key publications on the structural modification of thin films from the most widely studied binary and ternary ChVS compounds (As2S3, As2Se3, Ge2Sb2Te5, etc.) to show the use of irradiated samples as metasurfaces for photonic applications and promising phase-change data storage.
{"title":"Structural Transformations and Formation of Microstructures and Nanostructures in Thin Films of Chalcogenide Vitreous Semiconductors","authors":"S. V. Zabotnov, P. K. Kashkarov, A. V. Kolobov, S. A. Kozyukhin","doi":"10.1134/s2635167623600542","DOIUrl":"https://doi.org/10.1134/s2635167623600542","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Chalcogenide vitreous semiconductors (ChVSs) are of both fundamental and applied interest as materials in which reversible structural transformations within the amorphous phase and phase transitions to the crystalline state can be effectively implemented and various microstructures and nanostructures can be obtained as a result of external effects. One of the most promising methods for such ChVS modifications is the pulsed-laser-irradiation technique, which is a noncontact technology of local impact and makes it possible to change the structural, optical, and electrical properties of samples in a wide range. This includes methods based on the precision formation of a surface microrelief and nanorelief, and high contrast in the conductivity and refractive index between the crystalline and amorphous phases. This work reviews key publications on the structural modification of thin films from the most widely studied binary and ternary ChVS compounds (As<sub>2</sub>S<sub>3</sub>, As<sub>2</sub>Se<sub>3</sub>, Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub>, etc.) to show the use of irradiated samples as metasurfaces for photonic applications and promising phase-change data storage.</p>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139757291","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 : 2024-02-08DOI: 10.1134/s2635167623600645
A. S. Omelyanchik, K. V. Sobolev, N. R. Shilov, N. V. Andreev, M. V. Gorshenkov, V. V. Rodionova
Abstract
The structural and magnetic properties of magnetic iron-oxide nanoparticles obtained by a modified codeposition method with reduced concentrations of metal cations in the initial solution are studied, and an approach with ultrasonic stirring of the solution is developed. It is found that ultrasonic synthesis leads to the formation of nanoparticles with a high content of the crystalline phase compared to particles obtained using the classical approach with mechanical stirring, which produces nanoparticles of a smaller size and with a larger volume fraction of the X-ray amorphous phase. Nanoparticles obtained by the modified method have a high saturation magnetization, and therefore the approach can be adapted to obtain magnetic nanocomposites by introducing nanoparticles of a different nature into the solution, which will act as a nucleus for growth of the magnetic phase.
{"title":"Modification of the Codeposition Method for the Synthesis of Iron-Oxide Nanoparticles with a High Magnetization Value and a Controlled Reaction Yield","authors":"A. S. Omelyanchik, K. V. Sobolev, N. R. Shilov, N. V. Andreev, M. V. Gorshenkov, V. V. Rodionova","doi":"10.1134/s2635167623600645","DOIUrl":"https://doi.org/10.1134/s2635167623600645","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The structural and magnetic properties of magnetic iron-oxide nanoparticles obtained by a modified codeposition method with reduced concentrations of metal cations in the initial solution are studied, and an approach with ultrasonic stirring of the solution is developed. It is found that ultrasonic synthesis leads to the formation of nanoparticles with a high content of the crystalline phase compared to particles obtained using the classical approach with mechanical stirring, which produces nanoparticles of a smaller size and with a larger volume fraction of the X-ray amorphous phase. Nanoparticles obtained by the modified method have a high saturation magnetization, and therefore the approach can be adapted to obtain magnetic nanocomposites by introducing nanoparticles of a different nature into the solution, which will act as a nucleus for growth of the magnetic phase.</p>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139757193","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 : 2024-02-08DOI: 10.1134/s2635167623600499
A. A. Adamovich, M. Yu. Makhmud-Akhunov, I. O. Yavtushenko, V. N. Golovanov
Abstract
The features of creating supercapacitors based on anodic titanium-oxide nanotubes modified with a layer of a conducting polymer, i.e., the emeraldine form of polyaniline, are considered. Multilayer solid-state capacitive systems are formed based on nanostructured electrodes obtained by the anodic treatment of a titanium substrate in a solution of ethylene glycol and ammonium fluoride, followed by the deposition of a layer of polyaniline. Based on the analysis of voltammograms, the capacitance of nanostructured systems is determined to be 4.38 mF/cm2. The features of the influence of the structure of the anodic-formed oxide on the capacitance characteristics of the system are considered. It is established that as a result of the polymorphic transformation of amorphous anodic titanium oxide into crystalline titanium oxide during isothermal annealing, the voltammogram of the systems under study takes on a shape close to an ideal rectangular one, and the capacitance increases by a factor of 2. Based on the impedance-spectroscopy data of the studied samples, an equivalent circuit is constructed and the resistance and capacitance characteristics of the formed supercapacitors are determined.
{"title":"Solid-State Supercapacitors Based on a Highly Ordered Array of Titanium-Oxide Nanotubes Modified with Polyaniline","authors":"A. A. Adamovich, M. Yu. Makhmud-Akhunov, I. O. Yavtushenko, V. N. Golovanov","doi":"10.1134/s2635167623600499","DOIUrl":"https://doi.org/10.1134/s2635167623600499","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The features of creating supercapacitors based on anodic titanium-oxide nanotubes modified with a layer of a conducting polymer, i.e., the emeraldine form of polyaniline, are considered. Multilayer solid-state capacitive systems are formed based on nanostructured electrodes obtained by the anodic treatment of a titanium substrate in a solution of ethylene glycol and ammonium fluoride, followed by the deposition of a layer of polyaniline. Based on the analysis of voltammograms, the capacitance of nanostructured systems is determined to be 4.38 mF/cm<sup>2</sup>. The features of the influence of the structure of the anodic-formed oxide on the capacitance characteristics of the system are considered. It is established that as a result of the polymorphic transformation of amorphous anodic titanium oxide into crystalline titanium oxide during isothermal annealing, the voltammogram of the systems under study takes on a shape close to an ideal rectangular one, and the capacitance increases by a factor of 2. Based on the impedance-spectroscopy data of the studied samples, an equivalent circuit is constructed and the resistance and capacitance characteristics of the formed supercapacitors are determined.</p>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139757215","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 : 2024-02-08DOI: 10.1134/s2635167623601109
A. G. Ramazanova, V. V. Korolev, O. V. Balmasova, N. A. Fomina
Abstract
In this work, the synthesis of a magnetite/graphene composite and a magnetic fluid based on it is carried out. The physical–chemical and magnetic–thermal properties of the obtained samples are studied. It is established that in the magnetite/graphene composite magnetite nanoparticles are adsorbed on the graphene surface in the form of aggregates. It is found that the specific surface area and pore volume of the magnetite/graphene composite are higher than the values for magnetite. Analysis of the rheological curves of the magnetic fluid characterizes its structure as homogeneous and indicates a uniform distribution of the dispersed phase in the dispersion medium. It is established that the magnetic fluid with the composite is thermally stable up to 210°С. The values of the specific heat capacity of the synthesized sample are slightly higher than the heat capacity of the liquid without graphene additives. It is noted that the addition of an insignificant part of graphene to the magnetic phase of the magnetic fluid leads to a twofold increase in the value of the magnetocaloric effect (MCE) and changes the shape of the temperature dependence of the MCE in the studied temperature range.
{"title":"On the Physical–Chemical and Magnetic–Thermal Properties of Magnetite Magnetic Fluids with the Addition of Graphene","authors":"A. G. Ramazanova, V. V. Korolev, O. V. Balmasova, N. A. Fomina","doi":"10.1134/s2635167623601109","DOIUrl":"https://doi.org/10.1134/s2635167623601109","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In this work, the synthesis of a magnetite/graphene composite and a magnetic fluid based on it is carried out. The physical–chemical and magnetic–thermal properties of the obtained samples are studied. It is established that in the magnetite/graphene composite magnetite nanoparticles are adsorbed on the graphene surface in the form of aggregates. It is found that the specific surface area and pore volume of the magnetite/graphene composite are higher than the values for magnetite. Analysis of the rheological curves of the magnetic fluid characterizes its structure as homogeneous and indicates a uniform distribution of the dispersed phase in the dispersion medium. It is established that the magnetic fluid with the composite is thermally stable up to 210°С. The values of the specific heat capacity of the synthesized sample are slightly higher than the heat capacity of the liquid without graphene additives. It is noted that the addition of an insignificant part of graphene to the magnetic phase of the magnetic fluid leads to a twofold increase in the value of the magnetocaloric effect (MCE) and changes the shape of the temperature dependence of the MCE in the studied temperature range.</p>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139757047","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 : 2024-02-08DOI: 10.1134/s2635167623600700
M. V. Zvereva, G. P. Aleksandrova, T. V. Fadeeva
Abstract
The results of the synthesis of a biologically active nanostructured polymer system based on natural κ-carrageenan polysaccharide, which simultaneously acts as a reducing and stabilizing agent for emerging gold nanoparticles, are presented. The structure and nanomorphological characteristics of the resulting nanocomposite (in particular, in an aqueous solution), represented by κ-carrageenan stabilized Au0 nanoparticles, the size of which varies in the range of 6–20 nm, are established using modern spectral (infrared and optical spectroscopy, dynamic light scattering) and microscopic (transmission electron microscopy) methods. It is for the first time established that the Au0NP/κ-CG-DP nanocomposite has pronounced anticoagulant activity, affecting the intrinsic and extrinsic blood-coagulation pathways.
{"title":"On the Biological Activity of a Gold-Containing Nanocomposite Based on Sulfated Carrageenan Polysaccharide","authors":"M. V. Zvereva, G. P. Aleksandrova, T. V. Fadeeva","doi":"10.1134/s2635167623600700","DOIUrl":"https://doi.org/10.1134/s2635167623600700","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The results of the synthesis of a biologically active nanostructured polymer system based on natural κ-carrageenan polysaccharide, which simultaneously acts as a reducing and stabilizing agent for emerging gold nanoparticles, are presented. The structure and nanomorphological characteristics of the resulting nanocomposite (in particular, in an aqueous solution), represented by κ-carrageenan stabilized Au<sup>0</sup> nanoparticles, the size of which varies in the range of 6–20 nm, are established using modern spectral (infrared and optical spectroscopy, dynamic light scattering) and microscopic (transmission electron microscopy) methods. It is for the first time established that the Au<sup>0</sup>NP/κ-CG-DP nanocomposite has pronounced anticoagulant activity, affecting the intrinsic and extrinsic blood-coagulation pathways.</p>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139757202","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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