Phase autowaves in the near-electrode layer in the electrochemical cell with a magnetic fluid

Chekanov, V. S.; Kandaurova, N. V.

doi:10.1016/j.jmmm.2016.09.093

Cited by 12 publications

(15 citation statements)

References 2 publications

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“…The visible color change of the layer is explained by the shift of spectrum maximum due to the increase of the structure "conductive ITO coatingnear-electrode layer" optical thickness. If the voltage on electrodes is more than critical voltage ($12 V), particles in the near-electrode layer become unstable, and the autowave process (AW-process) starts [6].…”

Section: Methodsmentioning

confidence: 99%

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Autowave Processes in Magnetic Fluid: Electrically Controlled Interference

Chekanov¹,

Kandaurova²,

Drozdova³

et al. 2020

Nanofluid Flow in Porous Media

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The chapter considers autowaves that were observed in the thin near-electrode layer of concentrated magnetic fluid. Autowave process is a unique object for the study of self-organization. We observed pacemakers (leading centers), reverberators (spiral waves), and wave diffraction. A mechanism for the appearance of an autowave process has been developed; its mathematical model has been proposed and realized by means of computer simulation. As a basic method of observation, we used electrically controlled interference. This method watches the changes in the spectrum of reflected light from a two-layer structure with variable thickness: "conductive ITO coating-a layer of concentrated magnetic fluid" in an electric field.

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Section: Methodsmentioning

confidence: 99%

“…We managed to observe an autowave process (Video 1 available at https://yadi. sk/i/rUBv-Mx12DqFLQ) in a thin near-electrode layer of a magnetic fluid (MF) placed between two electrodes in an electric field [5,6].…”

Section: Introductionmentioning

confidence: 99%

Autowave Processes in Magnetic Fluid: Electrically Controlled Interference

Chekanov¹,

Kandaurova²,

Drozdova³

et al. 2020

Nanofluid Flow in Porous Media

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“…The near-electrode layer has a special property-changing the charge sign of colloidal particles, which occurs with the participation of surfactant molecules used to stabilize the dispersed system [25]. In turn, this "recharging" (here and after we call "recharging" the changing of the charge sign) of particles in the near-electrode layer is the basis of the physical mechanism for the development of self-sustained nonlinear waves (autowaves) [26]. Autowave processes are a vivid example of self-organization.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Study of an Autowave Process in a Magnetic Fluid

Chekanov

Коваленко

2022

IJMS

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Magnetic fluid (MF) is a colloidal system consisting of ferromagnetic particles (magnetite) with a diameter of ~10 nm suspended in a dispersion medium of a carrier fluid (for example, kerosene). A distinctive feature of magnetic fluid is the fact that when an electric field is applied to it using two electrodes, thin layers consisting of close-packed particles of the dispersed phase are formed in the regions near the surface of both electrodes. These layers significantly affect the macroscopic properties of the colloidal system. In this work, the interpretation of the near-electrode layer is for the first time given as a new type of liquid membrane, in which the particles of the dispersed phase become charged with the opposite sign. On the basis of experimental studies, we propose a physicochemical mechanism of the autowave process in a cell with a magnetic fluid. It is based on the idea of oppositely recharging colloidal particles of magnetite in a liquid membrane. A mathematical model of an autowave process, which is described by a system of coupled partial differential equations of Nernst–Planck–Poisson and Navier–Stokes with appropriate boundary conditions, is proposed for the first time. One-dimensional, two-dimensional, and three-dimensional versions of the model are considered. The dependence of the frequency of concentration fluctuations on the stationary voltage between the electrodes was obtained, and the time of formation of a liquid membrane was estimated. Qualitative agreement between theoretical and experimental results has been established.

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“…В [6] было показано, что тонкий приэлектродный слой является активной средой, в которой наблюдались автоволны (см. [7]). Подробное описание экспериментальной установки и техники проведения эксперимента по наблюдению автоволн в магнитной жидкости можно найти в [6,7].…”

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“…[7]). Подробное описание экспериментальной установки и техники проведения эксперимента по наблюдению автоволн в магнитной жидкости можно найти в [6,7].…”

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Математическое Моделирование Автоволновых Процессов В Ячейке С Наноструктурированной Жидкостью

Chekanov

Кандаурова²,

Kandaurova

et al. 2019

Итоги науки и техники. Серия «Современная математика и ее прило

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Найдено решение математической модели автоволнового процесса в тонком приэлектродном слое магнитной жидкости. Модификация базовой системы ФитцХью - Нагумо, взятой за основу математической модели, позволила получить результаты, аналогичные натурному эксперименту. В качестве критерия адекватности модели выступает визуальное соответствие эксперименту, а также наличие в решении основных явлений, наблюдаемых в автоволновом процессе, таких как ревербераторы, пейсмекеры, огибание препятствий и др.

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Phase autowaves in the near-electrode layer in the electrochemical cell with a magnetic fluid

Cited by 12 publications

References 2 publications

Autowave Processes in Magnetic Fluid: Electrically Controlled Interference

Autowave Processes in Magnetic Fluid: Electrically Controlled Interference

Experimental and Theoretical Study of an Autowave Process in a Magnetic Fluid

Математическое Моделирование Автоволновых Процессов В Ячейке С Наноструктурированной Жидкостью

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