scholarly journals ELECTROPHORESIS IN THE TOTAL (CONSTANT AND ALTERNATING) ELECTRIC FIELD. II. PECULIARITIES OF THE COMBINED IMPACT OF ALTERNATING AND CONSTANT ELECTRIC FIELDS

2020 ◽  
Vol 30 (4) ◽  
pp. 46-51
Author(s):  
B. P. Sharfarets ◽  
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Constant Electric Field ◽  
Electrokinetic Phenomena ◽  
Alternating Electric Fields ◽  
Alternating Electric Field ◽  
Electroacoustic Transducer ◽  
Dispersed Medium ◽  
Hydrodynamic Field ◽  
Combined Impact

The hydrodynamics of electrophoresis under the simultaneous impact of constant and alternating electric fields is considered. It has been shown that when the constant and alternating external fields are combined, the energy of the constant electric field is transferred into the alternating hydrodynamic field. An example is given of a dispersed medium in which a giant dispersion of the dielectric constant can arise, which in turn can contribute to an increase in the total electrophoresis rate. Analogies of the behavior of the considered dispersed medium with the action of an electroacoustic transducer based on the use of electrokinetic phenomena are given.

Particle Compaction with Alternating Electric Fields: The Effects of Electrode Geometry

1986 ◽  
Vol 73 ◽  
Author(s):  
Alan J. Hurd
Keyword(s):  
Electric Fields ◽  
Colloidal Particles ◽  
Dielectric Material ◽  
Double Layers ◽  
Electrode Geometry ◽  
Dipole Interactions ◽  
Alternating Electric Fields ◽  
Alternating Electric Field ◽  
Dc Bias ◽  
Induced Dipoles

ABSTRACTA technique for inducing ordered, close-packed arrangements of various symmetries among colloidal particles is discussed. An external alternating electric field applied to the colloid induces dipole interactions of variable strength by polarizing either the dielectric material of the particles or their electrostatic double layers. Ordering in various symmetries can be obtained by switching the field rapidly between pairs of electrodes, thereby changing the orientation of the induced dipoles. A small dc bias serves to deposit and compact the aligned particles.

Manipulation and assembly behavior of Spirulina-templated microcoils in the electric field

RSC Advances ◽  
2016 ◽  
Vol 6 (80) ◽  
pp. 76716-76723 ◽  
Author(s):  
Xinghao Li ◽  
Jun Cai ◽  
Lili Sun ◽  
Yue Yue ◽  
Deyuan Zhang
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Alternating Electric Fields ◽  
Assembly Behavior

Manipulation and assembly of complicated metallic Spirulina-templated microcoils can be achieved through alternating electric fields.

Electronic structure of POPC phospholipids under constant electric field

2017 ◽  
Vol 31 (22) ◽  
pp. 1750157
Author(s):  
Jaciéli Evangelho de Figueiredo ◽  
Leandro Barros da Silva
Keyword(s):  
Electronic Structure ◽  
Dipole Moment ◽  
External Field ◽  
Electric Field ◽  
Electric Fields ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Constant Electric Field ◽  
Ab Initio Study ◽  
Electronic And Structural Properties

We report in the present paper an ab initio study on the electronic and structural properties of phospholipidic membranes under the influence of electric fields. We show that the external field alters the charge distribution of the molecule leading to a modification in the electric dipole moment. The torque on the phospholipid may then cause a transmembranar stress, which by its turn, weakens the membrane allowing to the formation of a pore.

Membrane Fusion and Deformation of Red Blood Cells by Electric Fields

1980 ◽  
Vol 35 (11-12) ◽  
pp. 1081-1085 ◽  
Author(s):  
Peter Scheurich ◽  
Ulrich Zimmermann ◽  
Maja Mischel ◽  
Ingolf Lamprecht
Keyword(s):  
Electric Field ◽  
Red Blood Cells ◽  
Membrane Fusion ◽  
Electric Fields ◽  
Blood Cells ◽  
Electrical Breakdown ◽  
Osmotic Shock ◽  
Sine Wave ◽  
Hypotonic Solution ◽  
Alternating Electric Field

Abstract Human red blood cells suspended in a slightly hypotonic solution of low electric conductivity were exposed to an inhomogeneous and alternating electric field (sine wave, 30 V peak-to-peak value, electrode distance 120 μm, 0.5 to 2 MHz). Due to the dielectrophoretic effect the cells align parallel to the field lines under the formation of pearl chains. At high voltages (10 V amplitude) membrane fusion is observed between the adhered red blood cells in the pearl chains, whereby the chains become attached to the electrodes. In contrast to the pearl chains observed at voltages of up to 5 V amplitude the resulting fused and uniform aggregates which exhibit no recognisable individual cells under the light microscope, remain stable, even after the alternating electric field has been switched off or after haemolysis in response to osmotic shock. The fused aggregates are highly elastic. If the field strength of the applied alternating electric field is further increased they are stretched in the direction of the opposite electrode. Frequently, bridges are formed between the two electrodes. The uniform bridges remain stable for some time even in the absence of an electric field. The possibility of cell fusion and its initiation by electrical breakdown of the cell membranes are discussed.

scholarly journals Особенности ионизации примесей в квазиклассически сильных постоянном и переменном электрических полях в двумерной сверхрешетке на основе графена

2019 ◽  
Vol 53 (7) ◽  
pp. 927
Author(s):  
П.В. Бадикова ◽  
С.Ю. Глазов ◽  
Г.А. Сыродоев
Keyword(s):  
Absorption Coefficient ◽  
Electric Fields ◽  
Constant Electric Field ◽  
Polarization Vector ◽  
Radiation Detectors ◽  
Slow Increase ◽  
Low Frequencies ◽  
High Frequencies ◽  
Alternating Electric Fields ◽  
Strong Electric Fields

The absorption coefficient of an electromagnetic wave in a two-dimensional graphene-based superlattice in the presence of a constant electric field for the case of quasiclassically strong electric fields is investigated. Anisotropy of the absorption coefficient was found for different orientations of the constant vector voltage and the polarization vector of alternating electric fields. It is shown that a slow increase in the absorption coefficient at low frequencies is due to impurity absorption, and it’s more rapid growth at high frequencies is determined by intermini-bands transitions. These features can be used to create radiation detectors.

scholarly journals Developing methods for mathematical modeling of a two-phase dielectric-electrolyte microsystem

2021 ◽  
Vol 2057 (1) ◽  
pp. 012119
Author(s):  
E V Gorbacheva ◽  
E N Kalaidin
Keyword(s):  
Electric Fields ◽  
Stokes Equations ◽  
Constant Electric Field ◽  
Lower Surface ◽  
Short Wave ◽  
Two Phase ◽  
One Dimensional ◽  
Alternating Electric Fields ◽  
The One ◽  
The Mathematical Model

Abstract In this paper, we propose a numerical solution to the problem of stability of a two-phase dielectric / electrolyte system under direct and alternating electric fields. The lower wall adjacent to the electrolyte is assumed to be a charged surface, while the upper one is electrically insulated. The charge on the lower surface is supposed to be stationary, and the surface charge on the free interface between liquids is assumed to be mobile. The model is described by a system of Nernst-Planck-Poisson-Stokes equations. The mathematical model is closed by the corresponding boundary conditions. The linear stability of the one-dimensional flow is investigated. At a constant electric field, and the presence of two types of instabilities is found: short-wave and long-wave.

scholarly journals Low frequency weak electric fields can induce structural changes in water

PLoS ONE ◽  
2021 ◽  
Vol 16 (12) ◽  
pp. e0260967
Author(s):  
Iman Rad ◽  
Rainer Stahlberg ◽  
Kurt Kung ◽  
Gerald H. Pollack
Keyword(s):  
Contact Angle ◽  
Electric Field ◽  
Electric Fields ◽  
Structural Changes ◽  
Low Frequency ◽  
Bulk Water ◽  
Platinum Electrodes ◽  
Exclusion Zone ◽  
Alternating Electric Fields ◽  
E 600

Low frequency electric fields were exposed to various water samples using platinum electrodes mounted near the water surface. Responses were monitored using a spectro-radiometer and a contact-angle goniometer. Treatment of DI (deionized), EZ (Exclusion Zone), and bulk water with certain electromagnetic frequencies resulted in a drop of radiance persisting for at least half an hour. Compared to DI water, however, samples of EZ and bulk water showed lesser radiance drop. Contact-angle goniometric results confirmed that when treated with alternating electric fields (E = 600 ± 150 V/m, f = 7.8 and 1000 Hz), droplets of EZ and bulk water acquired different charges. The applied electric field interacted with EZ water only when electrodes were installed above the chamber, but not beneath. Further, when DI water interacted with an electric field applied from above (E = 600 ± 150 V/m, f = 75 Hz), its radiance profile became similar to that of EZ water. Putting these last two findings together, one can say that application of an electric field on DI water from above (E = 600 ± 150 V/m, f = 7.8 to 75 Hz) may induce a molecular ordering in DI water similar to that of EZ water.

scholarly journals Multiphoton intersubband transitions in an armchair graphene nanoribbon

2021 ◽  
Vol 2103 (1) ◽  
pp. 012130
Author(s):  
B S Monozon ◽  
T A Fedorova ◽  
P Schmelcher
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Constant Electric Field ◽  
Graphene Nanoribbon ◽  
Laser Technique ◽  
Strong Light ◽  
Vacuum Decay ◽  
Experimental Values ◽  
Armchair Graphene Nanoribbon ◽  
Armchair Graphene

Abstract We present an analytical approach to the problem of the interband transitions in an armchair graphene nanoribbon (AGNR), exposed to the time-periodic electric field of strong light wave, polarized parallel to the ribbon axis. The two-dimensional Dirac equation for the massless electron subject to the ribbon confinement is employed. In the resonant approximation the probability of the transitions between the valence and conduction size-quantized subbands are calculated in an explicit form. We trace the dependencies of the Rabi frequency for these transitions on the ribbon width and electric field strength for both the multiphoton-assisted and tunneling regimes relevant to the fast oscillating and practically constant electric field, respectively. Estimates of the expected experimental values for the typically employed AGNR and laser technique facilities show that the Rabi oscillations can be observed under laboratory conditions. The data, corresponding to the intersubband tunneling, makes the AGNR a 1D condensed matter analog, in which the quantum electrodynamic vacuum decay can be detected by the employment of the attainable electric fields.

Numerical simulation of the leaky dielectric microdroplet generation in electric fields

2016 ◽  
Vol 27 (01) ◽  
pp. 1650012 ◽  
Author(s):  
Reza Kamali ◽  
Mohammad Karim Dehghan Manshadi
Keyword(s):  
Biological Sciences ◽  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
Electric Fields ◽  
Constant Electric Field ◽  
Fluid Volume ◽  
Dielectric Fluids ◽  
Leaky Dielectric ◽  
Vast Range

Microdroplet generation has a vast range of applications in the chemical, biomedical, and biological sciences. Several devices are applied to produce microdroplets, such as Co-flow, T-junction and Flow-focusing. The important point in the producing process is controlling the separated fluid volume in these devices. On the other hand, a large number of liquids, especially aqueous one, are influenced by electric or magnetic fields. As a consequence, an electric field could be used in order to affect the separated fluid volume. In this study, effects of an electric field on the microdroplet generation in a Co-flow device are investigated numerically. Furthermore, effects of some electrical properties such as permittivity on the separating process of microdroplets are studied. Leaky dielectric and perfect dielectric models are used in this investigation. According to the results, in the microdroplet generating process, leaky dielectric fluids show different behaviors, when an electric field is applied to the device. In other words, in a constant electric field strength, the volume of generated microdroplets can increase or decrease, in comparison with the condition without the electric field. However, for perfect dielectric fluids, droplet volume always decreases with increasing the electric field strength. In order to validate the numerical method of this study, deformation of a leaky dielectric droplet in an electric field is investigated. Results are compared with Taylor theoretical model.

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