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Effect of Temperature on the Electrorheological Behavior of Porous Chitosan Particles in Polydimethylsiloxane 温度对多孔壳聚糖颗粒在聚二甲基硅氧烷中电流变行为的影响
IF 0.9 4区 化学
Doklady Physical Chemistry Pub Date : 2022-04-22 DOI: 10.1134/S0012501622020026
V. V. Kovaleva, N. M. Kuznetsov, A. Yu. Vdovichenko, Y. D. Zagoskin, T. E. Grigoriev,  S. N. Chvalun
{"title":"Effect of Temperature on the Electrorheological Behavior of Porous Chitosan Particles in Polydimethylsiloxane","authors":"V. V. Kovaleva,&nbsp;N. M. Kuznetsov,&nbsp;A. Yu. Vdovichenko,&nbsp;Y. D. Zagoskin,&nbsp;T. E. Grigoriev,&nbsp; S. N. Chvalun","doi":"10.1134/S0012501622020026","DOIUrl":"10.1134/S0012501622020026","url":null,"abstract":"<p>The rheological behavior of a 1 wt % suspension of highly porous chitosan particles in polydimethylsiloxane in a high electric field has been studied as a function of temperature. The static and dynamic yield stress in an electric field were found to slightly change with a change in shape of the flow curves. The effective response of the electrorheological fluid decreases with increasing temperature. There is a correlation between the electrophysical characteristics of the suspension and its rheological behavior.</p>","PeriodicalId":532,"journal":{"name":"Doklady Physical Chemistry","volume":"502 2","pages":"23 - 27"},"PeriodicalIF":0.9,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5146304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Effect of Titanium Doping of Lithium-Rich Cathode Materials 钛掺杂对富锂正极材料的影响
IF 0.9 4区 化学
Doklady Physical Chemistry Pub Date : 2022-04-22 DOI: 10.1134/S0012501622010031
L. S. Pechen, E. V. Makhonina, A. E. Medvedeva, Yu. A. Politov,  I. L. Eremenko
{"title":"Effect of Titanium Doping of Lithium-Rich Cathode Materials","authors":"L. S. Pechen,&nbsp;E. V. Makhonina,&nbsp;A. E. Medvedeva,&nbsp;Yu. A. Politov,&nbsp; I. L. Eremenko","doi":"10.1134/S0012501622010031","DOIUrl":"10.1134/S0012501622010031","url":null,"abstract":"<p>The influence of Ti doping on the functional properties of the lithium-rich Li<sub>1.2</sub>(Mn<sub>0.67</sub>Ni<sub>0.17</sub>Co<sub>0.15</sub>Ti<sub>0.02</sub>)<sub>0.8</sub>O<sub>2</sub> cathode material for lithium-ion batteries was studied. The oxide was synthesized by co-precipitation of the appropriate carbonate precursor followed by a solid-state reaction. Doping 2 at % titanium in the transition metal sites increased the material energy and improved its cycling performance. Evidence in favor of positive doping effect on the kinetics of the processes occurring in the cathode material during cycling was obtained.</p>","PeriodicalId":532,"journal":{"name":"Doklady Physical Chemistry","volume":"502 1","pages":"7 - 10"},"PeriodicalIF":0.9,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5146313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
High-Frequency Electron Transport under Pulsed Mechanical Action on Polypropylene–Graphene Nanoplates Composite 脉冲机械作用下聚丙烯-石墨烯纳米板复合材料的高频电子输运
IF 0.9 4区 化学
Doklady Physical Chemistry Pub Date : 2022-04-22 DOI: 10.1134/S0012501622020014
A. I. Aleksandrov, V. G. Shevchenko, A. N. Klyamkina, P. M. Nedorezova,  A. N. Ozerin
{"title":"High-Frequency Electron Transport under Pulsed Mechanical Action on Polypropylene–Graphene Nanoplates Composite","authors":"A. I. Aleksandrov,&nbsp;V. G. Shevchenko,&nbsp;A. N. Klyamkina,&nbsp;P. M. Nedorezova,&nbsp; A. N. Ozerin","doi":"10.1134/S0012501622020014","DOIUrl":"10.1134/S0012501622020014","url":null,"abstract":"<p>A phenomenon of change in the frequency of a mechanically activated current was detected for the first time. This phenomenon consists in the fact that electric current pulses produced by a rheological explosion differ in frequency characteristics between a polypropylene‑graphene nanoplates composite and the matrix polymer (polypropylene). It was shown that the Fourier transforms of the current signals from the composite according to the Havriliak–Negami model for the experimental frequency dependence of conductivity agree well with the results of the calculation using the Drude model for multilayer graphene.</p>","PeriodicalId":532,"journal":{"name":"Doklady Physical Chemistry","volume":"502 2","pages":"19 - 22"},"PeriodicalIF":0.9,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5146301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thermodynamic Functions of Europium Hafnate at 0–1300 K and Schottky Anomaly 0-1300 K的铪热力函数与Schottky异常
IF 0.9 4区 化学
Doklady Physical Chemistry Pub Date : 2022-04-22 DOI: 10.1134/S001250162201002X
A. V. Guskov, P. G. Gagarin, V. N. Guskov, A. V. Tyurin, K. S. Gavrichev
{"title":"Thermodynamic Functions of Europium Hafnate at 0–1300 K and Schottky Anomaly","authors":"A. V. Guskov,&nbsp;P. G. Gagarin,&nbsp;V. N. Guskov,&nbsp;A. V. Tyurin,&nbsp;K. S. Gavrichev","doi":"10.1134/S001250162201002X","DOIUrl":"10.1134/S001250162201002X","url":null,"abstract":"<p>The molar heat capacity of europium hafnate at low temperatures (4–345 K) was determined for the first time. The contribution of the Schottky anomaly to the heat capacity was estimated and thermodynamic functions in the range of 0–1300 K were calculated.</p>","PeriodicalId":532,"journal":{"name":"Doklady Physical Chemistry","volume":"502 1","pages":"1 - 6"},"PeriodicalIF":0.9,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5146305","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Atomistic Calculation of the Melting Point of the High-Entropy Cantor Alloy CoCrFeMnNi 高熵康托合金CoCrFeMnNi熔点的原子计算
IF 0.9 4区 化学
Doklady Physical Chemistry Pub Date : 2022-04-22 DOI: 10.1134/S0012501622010018
I. A. Balyakin,  A. A. Rempel
{"title":"Atomistic Calculation of the Melting Point of the High-Entropy Cantor Alloy CoCrFeMnNi","authors":"I. A. Balyakin,&nbsp; A. A. Rempel","doi":"10.1134/S0012501622010018","DOIUrl":"10.1134/S0012501622010018","url":null,"abstract":"<p>The melting point of the high-entropy Cantor alloy CoCrFeMnNi was calculated by the classical molecular dynamics method. Interatomic potential as a set of artificial neural networks was used for simulation of this type for the first time. Neural network coefficients were optimized using machine learning technique with ab initio molecular dynamics data. Ab initio molecular dynamics simulation was carried out for a wide temperature range using the same initial crystalline state. The initial state for ab initio simulations was a special quasi-random structure optimized on pairs of the nearest neighbors. The two-phase method based on the movement of phase boundary in a crystal–melt system was used to calculate the melting point. It should be noted that, although the training set did not contain explicit two-phase configurations, the computed melting point proved to be in a satisfactory agreement with available experimental data. Thus, the melting point of the high-entropy CoCrFeMnNi alloy was calculated without the use of empirical data.</p>","PeriodicalId":532,"journal":{"name":"Doklady Physical Chemistry","volume":"502 1","pages":"11 - 17"},"PeriodicalIF":0.9,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4845258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Fracture Pressure in Microdefects of Consolidated Materials 固结材料微缺陷中的断裂压力
IF 0.9 4区 化学
Doklady Physical Chemistry Pub Date : 2022-03-12 DOI: 10.1134/S0012501621110026
E. M. Morozov,  M. I. Alymov
{"title":"Fracture Pressure in Microdefects of Consolidated Materials","authors":"E. M. Morozov,&nbsp; M. I. Alymov","doi":"10.1134/S0012501621110026","DOIUrl":"10.1134/S0012501621110026","url":null,"abstract":"<p>The effect of the internal pressure of the gas in a pore or a cracklike defect on the critical fracture stress has been studied using fracture mechanics approaches. An analytical expression was derived for the dependence of the critical fracture stress on the internal pressure in the crack. The results of this work can be used in powder metallurgy and additive manufacturing of novel materials.</p>","PeriodicalId":532,"journal":{"name":"Doklady Physical Chemistry","volume":"501 1","pages":"111 - 113"},"PeriodicalIF":0.9,"publicationDate":"2022-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4504777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Preparation and Study of Properties of a New Biocomposite of Chitosan with 5,7-Bis(1-hydroxy-1-trifluoromethyl-2,2,2-trifluoroethyl)-8-hydroxyquinoline 壳聚糖- 5,7-二(1-羟基-1-三氟甲基-2,2,2-三氟乙基)-8-羟基喹啉生物复合材料的制备及性能研究
IF 0.9 4区 化学
Doklady Physical Chemistry Pub Date : 2022-03-12 DOI: 10.1134/S0012501621110014
I. S. Chaschin, E. I. Perepelkin, V. I. Dyachenko
{"title":"Preparation and Study of Properties of a New Biocomposite of Chitosan with 5,7-Bis(1-hydroxy-1-trifluoromethyl-2,2,2-trifluoroethyl)-8-hydroxyquinoline","authors":"I. S. Chaschin,&nbsp;E. I. Perepelkin,&nbsp;V. I. Dyachenko","doi":"10.1134/S0012501621110014","DOIUrl":"10.1134/S0012501621110014","url":null,"abstract":"<p>A new bioorganic composite was obtained by impregnation of 5,7-bis(1-hydroxy-1-trifluoromethyl-2,2,2-trifluoroethyl)-8-hydroxyquinoline (FOQ) into chitosan in 60% acetic acid. The resulting complex was found to be highly stable due to hydrogen bonding between the amino groups of chitosan and the highly acidic OH groups of FOQ. This composite inhibited the growth of gram-positive and gram-negative bacteria to a much greater extent than pristine chitosan. It is expected that the biocomposite would be used as an antibacterial coating with a prolonged service life for collagen matrices used for cardiac prostheses.</p>","PeriodicalId":532,"journal":{"name":"Doklady Physical Chemistry","volume":"501 1","pages":"114 - 118"},"PeriodicalIF":0.9,"publicationDate":"2022-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4504789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Vaporization Thermodynamics of GeO2 by High-Temperature Mass Spectrometry 高温质谱法研究GeO2的汽化热力学
IF 0.9 4区 化学
Doklady Physical Chemistry Pub Date : 2022-03-12 DOI: 10.1134/S0012501621120010
A. S. Smirnov, K. G. Smorchkov, N. A. Gribchenkova, A. S. Alikhanyan
{"title":"Vaporization Thermodynamics of GeO2 by High-Temperature Mass Spectrometry","authors":"A. S. Smirnov,&nbsp;K. G. Smorchkov,&nbsp;N. A. Gribchenkova,&nbsp;A. S. Alikhanyan","doi":"10.1134/S0012501621120010","DOIUrl":"10.1134/S0012501621120010","url":null,"abstract":"<p>Vaporization of GeO<sub>2</sub> (tetragonal and hexagonal) have been studied by the Knudsen effusion method in combination with mass spectrometry in the temperature range 1250–1370 K. It has been demonstrated that the saturated vapor over GeO<sub>2</sub> consists of GeO and O<sub>2</sub> molecules. Partial pressures of the equilibrium vapor components and their temperature dependences have been determined. The standard enthalpy of the heterogeneous reaction GeO<sub>2(s)</sub> = GeO<sub>(g)</sub> + 1/2O<sub>2(g)</sub> and the standard enthalpy of formation of GeO<sub>2</sub> (∆<sub><i>f</i></sub><i>H</i><span>(_{{298}}^{^circ })</span>(GeO<sub>(g)</sub>) = −41.7 ± 17.6 kJ mol<sup>–1</sup>) have been determined by the second- and third-law calculations.</p>","PeriodicalId":532,"journal":{"name":"Doklady Physical Chemistry","volume":"501 2","pages":"119 - 125"},"PeriodicalIF":0.9,"publicationDate":"2022-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4500898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of Surface Modification of Nanoparticles on the Mechanical Properties of Highly Crosslinked Epoxy Nanocomposites: Mesoscopic Simulation 纳米颗粒表面改性对高交联环氧纳米复合材料力学性能的影响:介观模拟
IF 0.9 4区 化学
Doklady Physical Chemistry Pub Date : 2022-02-10 DOI: 10.1134/S0012501621090025
M. D. Malyshev, D. V. Guseva, P. V. Komarov
{"title":"Effect of Surface Modification of Nanoparticles on the Mechanical Properties of Highly Crosslinked Epoxy Nanocomposites: Mesoscopic Simulation","authors":"M. D. Malyshev,&nbsp;D. V. Guseva,&nbsp;P. V. Komarov","doi":"10.1134/S0012501621090025","DOIUrl":"10.1134/S0012501621090025","url":null,"abstract":"<p>A mesoscopic model of a nanocomposite based on crosslinked polymer networks with embedded clay nanoparticles was developed. The model makes it possible to predict the main trends in changes in the mechanical properties of systems, taking into account the degree of crosslinking of nanoparticles with a polymer matrix. The performed simulations showed that modified nanoparticles can significantly improve the Young’s modulus of the nanocomposite compared to the unfilled polymer. It was also shown that the average value of the number of load-bearing chains determines the mechanical response of the coarse-grained model of the polymer system.</p>","PeriodicalId":532,"journal":{"name":"Doklady Physical Chemistry","volume":"500 1","pages":"92 - 96"},"PeriodicalIF":0.9,"publicationDate":"2022-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4723489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Sulfonated Films of Polyphenylquinoxaline. Preparation and Properties 聚苯基喹啉磺化膜。制备及性能
IF 0.9 4区 化学
Doklady Physical Chemistry Pub Date : 2022-02-10 DOI: 10.1134/S0012501621100018
M. I. Buzin, E. G. Bulycheva, N. M. Belomoina, G. G. Nikiforova, I. O. Volkov, A. N. Shchegolikhin, S. A. Bedin
{"title":"Sulfonated Films of Polyphenylquinoxaline. Preparation and Properties","authors":"M. I. Buzin,&nbsp;E. G. Bulycheva,&nbsp;N. M. Belomoina,&nbsp;G. G. Nikiforova,&nbsp;I. O. Volkov,&nbsp;A. N. Shchegolikhin,&nbsp;S. A. Bedin","doi":"10.1134/S0012501621100018","DOIUrl":"10.1134/S0012501621100018","url":null,"abstract":"<p>A promising method was proposed for the sulfonation of polyphenylquinoxaline films with sulfuric acid. The sulfonation in the films was confirmed by X-ray photoelectron and IR spectroscopies. The thermal characteristics and dielectric properties of the sulfonated films were studied.</p>","PeriodicalId":532,"journal":{"name":"Doklady Physical Chemistry","volume":"500 2","pages":"97 - 100"},"PeriodicalIF":0.9,"publicationDate":"2022-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4417569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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