Application of electrically controlled interference for observing the autowave process in the near-electrode layer of a magnetic fluid and in an electrically tunable color filter

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

doi:10.1364/jot.86.000016

Cited by 2 publications

(8 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The main idea of constructing such a model is to study the question of the possibility of the occurrence of autowave motion due to the recharging of MF particles near the electrodes or in the regions of localization of the space charge. The model is described by a boundary-value problem, which consists of a research area (Figure 6), a system of equations (6)(7)(8)(9)(10)(11)(12), and initial and boundary conditions (13)(14)(15)(16)(17)(18)(19)(20). When constructing the model, the following assumptions were made:…”

Section: Basic Equations Of the Modelmentioning

confidence: 99%

“…Under these assumptions, we made a model, which is described by the systems of coupled partial differential equations of Nernst-Planck-Poisson and Navier-Stokes, based on the basic physical laws of the conservation of matter and energy (6)(7)(8)(9)(10)(11)(12) and boundary conditions (13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23):…”

Section: Basic Equations Of the Modelmentioning

confidence: 99%

“…The Nernst-Planck Equation ( 6) describes the flow of charged particles of the dispersed phase of a magnetic fluid due to migration in an electric field, diffusion and convection, the charge numbers of positively charged particles The process of the wave appearance is associated with the process of the charging and recharging of particles, which is reflected in the boundary conditions (13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23).…”

Section: Basic Equations Of the Modelmentioning

confidence: 99%

“…As noted above, the recharging of magnetic fluid particles occurs in a liquid membrane located at the cathode and with a small thickness, due to ions injected from the cathode, which cannot "slip" through the liquid membrane and recombine with heteroions. This allows one to abstract from the thickness of the membrane and its location and represent it by the plane x = H. Moreover, let us assume that this plane is equipotential and negatively charged, i.e., is simultaneously a cathode (18).…”

Section: Boundary and Initial Conditionsmentioning

confidence: 99%

“…The presence of magnetic particles in the near-electrode regions has a significant influence on the electrophysical and optical effects, which are specific for magnetic fluids and are not observed in other liquid dielectrics. For example, when a cell with magnetic fluid is illuminated with light with a wide spectrum of wavelengths in an electric field, we see a change in the color of the electrode surface, which is explained by a shift in the spectrum maximum due to the formation of a near-electrode layer of particles and an increase in the optical thickness of the layer [18]. Labyrinth structures of ordered microdroplet aggregates are formed in a thin layer of a magnetic colloid [19].…”

Section: Introductionmentioning

confidence: 96%

See 4 more Smart Citations

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

Chekanov

Коваленко

2022

IJMS

View full text Add to dashboard Cite

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.

show abstract

Section: Basic Equations Of the Modelmentioning

confidence: 99%

Section: Basic Equations Of the Modelmentioning

confidence: 99%

Section: Basic Equations Of the Modelmentioning

confidence: 99%

Section: Boundary and Initial Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

See 3 more Smart Citations

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

Chekanov

Коваленко

2022

IJMS

View full text Add to dashboard Cite

show abstract

Experimental and Theoretical Study of Forced Synchronization of Self-Oscillations in Liquid Ferrocolloid Membranes

2022

View full text Add to dashboard Cite

A ferrocolloid is a suspension of nanometer-sized ferromagnetic particles (magnetite) in a carrier liquid (kerosene). A unique feature of a ferrocolloid is the fact that layers consisting of densely packed particles are formed near the electrode surface under the influence of an external electric field. Each layer is a liquid membrane, and its formation significantly affects the various properties of the system. For example, the development of a unique phenomenon in a ferrocolloid is self-organization (self-oscillations and autowaves). The applied external periodic force leads to a change (capture) of the frequency of the autowave process-forced synchronization of autowaves. The experimentally obtained synchronization was investigated by the method of electrically controlled interference. After multiple experiments and theoretical studies, a physical mechanism for the synchronization of the autowave process in a cell with a ferrocolloid was proposed for the first time. A mathematical model of forced synchronization of autowaves, which is described by a system of nonlinear differential equations, was proposed for the first time as well. Adding an external periodic force into the model led to a change in the frequency of autowaves; synchronization by an external force was confirmed by computational experiments.

show abstract

Application of electrically controlled interference for observing the autowave process in the near-electrode layer of a magnetic fluid and in an electrically tunable color filter

Cited by 2 publications

References 0 publications

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

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

Experimental and Theoretical Study of Forced Synchronization of Self-Oscillations in Liquid Ferrocolloid Membranes

Contact Info

Product

Resources

About