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Keywords = impedance hodograph

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9 pages, 3057 KiB  
Article
Nonlinear Transport and Magnetic/Magneto-Optical Properties of Cox(MgF2)100-x Nanostructures
by Sergey A. Ivkov, Konstantin A. Barkov, Evelina P. Domashevskaya, Elena A. Ganshina, Dmitry L. Goloshchapov, Stanislav V. Ryabtsev, Alexander V. Sitnikov and Pavel V. Seredin
Appl. Sci. 2023, 13(5), 2992; https://doi.org/10.3390/app13052992 - 26 Feb 2023
Cited by 4 | Viewed by 1593
Abstract
The aim of this work was to comprehensively study the effect of the variable atomic composition and structural-phase state of Cox(MgF2)100-x nanocomposites on their nonlinear transport and magnetic/magneto-optical properties. Micrometer-thick nanocomposite layers on glass substrates were obtained by [...] Read more.
The aim of this work was to comprehensively study the effect of the variable atomic composition and structural-phase state of Cox(MgF2)100-x nanocomposites on their nonlinear transport and magnetic/magneto-optical properties. Micrometer-thick nanocomposite layers on glass substrates were obtained by means of ion-beam sputtering of a composite target in the argon atmosphere in a wide range of compositions (x = 16–59 at.%). Using a low metal content in the nanocomposite, magnesium fluoride was kept in the nanocrystalline state. As the metal content increased, nanocrystalline cobalt was formed. The value of the resistive percolation threshold, xper = 37 at.%, determined from the concentration dependences of the electrical resistance of the nanocomposites coincided with the beginning of nucleation of the metallic nanocrystals in the MgF2 dielectric matrix. The absolute value of the maximum negative magnetoresistive effect in the nanocomposites was 5% in a magnetic field of 5.5 kG at a Co concentration of x = 27 at.%. Full article
(This article belongs to the Special Issue Novel Nanomaterials and Nanostructures)
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13 pages, 5030 KiB  
Article
Growth of the Cycle Life and Rate Capability of LIB Silicon Anodes Based on Macroporous Membranes
by Galina Li, Aleksander Rumyantsev, Ekaterina Astrova and Maxim Maximov
Membranes 2022, 12(11), 1037; https://doi.org/10.3390/membranes12111037 - 25 Oct 2022
Cited by 2 | Viewed by 1842
Abstract
This work investigated the possibility of increasing the cycle life and rate capability of silicon anodes, made of macroporous membranes, by adding fluoroethylene carbonate (FEC) to the complex commercial electrolyte. It was found that FEC leads to a decrease in the degradation rate; [...] Read more.
This work investigated the possibility of increasing the cycle life and rate capability of silicon anodes, made of macroporous membranes, by adding fluoroethylene carbonate (FEC) to the complex commercial electrolyte. It was found that FEC leads to a decrease in the degradation rate; for a sample without FEC addition, the discharge capacity at the level of Qdch = 1000 mAh/g remained unchanged for 220 cycles and the same sample with 3% FEC added to the electrolyte remained unchanged for over 600 cycles. FEC also improves the power characteristics of the anodes by 5–18%. Studies of impedance hodographs showed that in both electrolytes (with 0% and 3% FEC, respectively) the charge transfer resistance grows with an increasing number of cycles, while Solid Electrolyte Interphase (SEI) parameters, such as its resistance and capacitance, show little change. However, the addition of FEC more than halves the overall system impedance and reduces the resistance of the liquid electrolyte and all current carrying parts as well as the SEI film and charge transfer resistances. Full article
(This article belongs to the Section Membrane Applications)
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12 pages, 2245 KiB  
Article
Drop Drying on the Sensor: One More Way for Comparative Analysis of Liquid Media
by Tatiana Yakhno, Alexander Pakhomov, Anatoly Sanin, Vyacheslav Kazakov, Ruben Ginoyan and Vladimir Yakhno
Sensors 2020, 20(18), 5266; https://doi.org/10.3390/s20185266 - 15 Sep 2020
Cited by 3 | Viewed by 2424
Abstract
It is known that the processes of self-organization of the components of drying a liquid drop on a solid substrate are well reproduced under the same external conditions and are determined only by the composition and dispersion of the liquid. If the drop [...] Read more.
It is known that the processes of self-organization of the components of drying a liquid drop on a solid substrate are well reproduced under the same external conditions and are determined only by the composition and dispersion of the liquid. If the drop dries on the surface of the sensor device, these processes can be recorded and used as a passport characteristic of the liquid. The first half of the article is devoted to the description of the principles of the method and the proof of the validity of our assumptions. The second half of the article is devoted to the development of a user-friendly version of the device, where the change in the real and imaginary parts of the electrical impedance of the resonator was used as an informative parameter. The measure of the closeness of the relative positions of the hodographs of the compared samples on the complex plane is used as a criterion for the similarity-/-difference of various liquids. The design of a new sensor device and the results of its tests for distinguishing between different brands of alcoholic beverages and reconstituted milk of different concentrations are presented. Full article
(This article belongs to the Special Issue Biennial State-of-the-Art Sensors Technology in Russia 2020-2021)
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