scholarly journals Iterative Dipole Moment Method for the Dielectrophoretic Particle-Particle Interaction in a DC Electric Field

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Qing Zhang ◽  
Kai Zhang
Keyword(s):  
Dipole Moment ◽  
Electric Field ◽  
Moment Method ◽  
Particle Interaction ◽  
Particle Interactions ◽  
Electric Force ◽  
Microfluidic Systems ◽  
Initial Particle ◽  
Connection Line ◽  
Dc Electric Field

Electric force is the most popular technique for bioparticle transportation and manipulation in microfluidic systems. In this paper, the iterative dipole moment (IDM) method was used to calculate the dielectrophoretic (DEP) forces of particle-particle interactions in a two-dimensional DC electric field, and the Lagrangian method was used to solve the transportation of particles. It was found that the DEP properties and whether the connection line between initial positions of particles perpendicular or parallel to the electric field greatly affect the chain patterns. In addition, the dependence of the DEP particle interaction upon the particle diameters, initial particle positions, and the DEP properties have been studied in detail. The conclusions are advantageous in elelctrokinetic microfluidic systems where it may be desirable to control, manipulate, and assemble bioparticles.

scholarly journals Передача крутящего момента проводящей частице с использованием силы Лоренца

2022 ◽  
Vol 56 (1) ◽  
pp. 76
Author(s):  
А.И. Грачев
Keyword(s):  
Dipole Moment ◽  
Electric Field ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Field Application ◽  
Conductive Particle ◽  
Particle Rotation ◽  
Dc Electric Field ◽  
First Time ◽  
Cylindrical Particles

In the paper the concept of conductive particle rotation in DC electric field with including the Lorentz force providing generation of electric dipole moment of the particle is for the first time discussed. Some models of the torque transfer to spherical and cylindrical particles based on of the Hall effect at usual geometry and with additional electric field application and also in the case of implementation of the photoelectromagnetic effect are presented.

ELECTRORHEOLOGICAL AND DIELECTRIC PROPERTIES OF UREA/SIO2 NANOCOMPOSITE SUSPENSIONS MODIFIED BY N, N-DIMETHYLFORMAMIDE

2007 ◽  
Vol 21 (28n29) ◽  
pp. 4782-4789 ◽  
Author(s):  
TOMAS BELZA ◽  
VLADIMIR PAVLINEK ◽  
IVO KURITKA ◽  
PETR SAHA ◽  
OTAKAR QUADRAT
Keyword(s):  
Dielectric Properties ◽  
Electric Field ◽  
Particle Interaction ◽  
Great Influence ◽  
Relative Increase ◽  
Field Application ◽  
High Yield ◽  
Limit Values ◽  
Dc Electric Field ◽  
The Difference

In this study, electrorheological (ER) behaviour of silica nanocomposite suspensions treated with urea and N , N – dimethylformamide (DMF) in DC electric field has been investigated. While the ER effect of the neat silica itself was very low, the modification of silica nanoparticles improved compatibility of the solid and liquid phase and increased considerably ER activity of the system. In contrast to maximum possible concentration about 5 wt.% of neat silica due to particle aggregation 20 wt.% suspension of treated particles with low field-off viscosity could be prepared. The dielectric measurements showed that with increasing amount of urea deposited on the silica particles both the difference between the limit values of the relative permittivities and the relaxation frequency increased. This indicates a great influence of both particle polarizability and the rate of rearrangement of the ER structure in the electric field on the ER intensity. After DMF addition the changes in dielectric properties reflected the higher ER activity. At higher particle loading (25 wt.%) mutual particle interaction increased and field-off viscosity steeply rose. The comparison of the behavior of 20 and 25 wt.% suspensions of modified particles showed that even if high yield stress at higher particle content under electric field application sets in, its relative increase indicating the ER efficiency due to high field-off value may be much lower than at lower suspension loading.

scholarly journals The frequency-domain infrared spectrum of ammonia encodes changes in molecular dynamics caused by a DC electric field

2019 ◽  
Vol 116 (47) ◽  
pp. 23444-23447 ◽  
Author(s):  
Youngwook Park ◽  
Hani Kang ◽  
Robert W. Field ◽  
Heon Kang
Keyword(s):  
Molecular Dynamics ◽  
Dipole Moment ◽  
Infrared Spectrum ◽  
Electric Field ◽  
Frequency Domain ◽  
External Electric Field ◽  
Quantitative Characteristics ◽  
Dc Electric Field ◽  
Minimum Potential ◽  
Tunneling Dynamics

Ammonia is special. It is nonplanar, yet in v = 1 of the umbrella mode (ν2) its inversion motion is faster than J = 0↔1 rotation. Does the simplicity of the Chemist's concept of an electric dipole moment survive the competition between rotation, inversion, and a strong external electric field? NH3 is a favorite pedagogical example of tunneling in a symmetric double-minimum potential. Tunneling is a dynamical concept, yet the quantitative characteristics of tunneling are expressed in a static, eigenstate-resolved spectrum. The inverting-umbrella tunneling motion in ammonia is both large amplitude and profoundly affected by an external electric field. We report how a uniquely strong (up to 108 V/m) direct current (DC) electric field causes a richly detailed sequence of reversible changes in the frequency-domain infrared spectrum (the v = 0→1 transition in the ν2 umbrella mode) of ammonia, freely rotating in a 10 K Ar matrix. Although the spectrum is static, encoded in it is the complete inter- and intramolecular picture of tunneling dynamics.

Particle interactions in three-dimensional electrical field simulated by iterative dipole moment method

2016 ◽  
Vol 30 (16) ◽  
pp. 1650156
Author(s):  
Le Liu ◽  
Chuanchuan Xie ◽  
Bo Chen ◽  
Jiankang Wu
Keyword(s):  
Dipole Moment ◽  
Moment Method ◽  
Three Dimensional ◽  
Particle Interactions ◽  
Two Dimensional ◽  
Electrical Field ◽  
Maxwell Stress Tensor ◽  
Multiple Particles ◽  
Particle Chains ◽  
Multiple Particle

The dielectrophoresis (DEP) interactions of a few particles in a uniform two-dimensional (2D) electrical field have well been studied by Maxwell stress tensor (MST) method. Multiple particle interactions in three-dimensional (3D) electrical field are investigated in this work using iterative dipole moment (IDM) method which is an analytic algorithm without complicated numerical computations to solve for electrical field. The interactive DEP forces of particles calculated by IDM are found to be well agreed with those of MST method and much simple to implement. Using IDM method, a series of examples of multiple particles interactions and particle chains in a 3D uniform DC electrical field is presented. Randomly distributed similar dense particles (either all positive DEP (pDEP) or all negative DEP (nDEP) particles) in 3D uniform electrical field can generally form chains in lines parallel to the electrical field, except the case that all similar particles are in a plane perpendicular to the electrical field where the particles repel each other and move away in the plane. Randomly distributed dissimilar dense particles (mixture of pDEP and nDEP particles) can form (1) chains in lines, (2) clusters in a plane or (3) 3D groups. The chains, clusters and groups are of staggered arrangements of pDEP and nDEP particles, which are perpendicular to the electrical field.

AC ELECTRIC-FIELD-INDUCED ORIENTATION OF POLAR ORGANIC NANOCRYSTAL IN DISPERSE SYSTEM

2002 ◽  
Vol 01 (05n06) ◽  
pp. 737-741 ◽  
Author(s):  
T. ONODERA ◽  
M. YOSHIDA ◽  
S. OKAZOE ◽  
S. FUJITA ◽  
H. KASAI ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Electric Field ◽  
Optical Microscope ◽  
In Situ Observation ◽  
Ac Electric Field ◽  
Dc Electric Field ◽  
Reprecipitation Method ◽  
Orientational Motion ◽  
Display Monitor

Monodispersed DAST nanocrystals have almost been successfully fabricated by means of the inverse reprecipitation method. By employing AC electric field, high electric field of above ca. 1.0 kVcm -1 could be applied to polar DAST nanocrystals dispersed in decahydronaphthalene, so as to avoid electrophoresis of nanocrystals under DC electric field. The response of DAST nanocrystal dispersion to applied AC electric field was analyzed phenomenologically by fitting Langevin function, which provided a large permanent dipole moment of DAST nanocrystal. In addition, we have succeeded in in situ observation of AC electric-field-induced orientational motion of DAST crystals by using an optical microscope. The present DAST nanocrystal dispersion system will be expected as an optical device like display monitor.

Nonlinear photoacoustic effect of semiconductors in dc electric field

1990 ◽  
Vol 68 (8) ◽  
pp. 3865-3871 ◽  
Author(s):  
Jian‐chun Cheng ◽  
Shu‐yi Zhang ◽  
Yue‐sheng Lu
Keyword(s):  
Electric Field ◽  
Photoacoustic Effect ◽  
Dc Electric Field
Sign in / Sign up

Export Citation Format

Share Document