Ac Electrokinetics
Ac Electrokinetics - Related Videos
20:38
AC Electrokinetic Phenomena Generated by Microelectrode Structures
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Cited by 3 •
2008
Manipulating fluids and suspended particles in the micro- and nano-scale is becoming more of a reality as enabling technologies, like AC electrokinetics, continue to develop. Here, we discuss the physics behind AC electrokinetics, how to fabricate these devices and how to interpret the experimental observations.
09:02
AC Synchronous Machine Synchronization
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2023
Source: Ali Bazzi, Department of Electrical Engineering, University of Connecticut, Storrs, CT. Three-phase wound-rotor synchronous generators are the main source of electrical power worldwide. They require a prime mover and an exciter in order to generate power. The prime mover can be a turbine spun by fluid (gas or liquid), thus the sources of the fluid can be water running off a dam through a long nozzle, steam from water evaporated using burned coal, etc. Most power plants including coal,...
11:19
AC Synchronous Machine Characterization
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2023
Source: Ali Bazzi, Department of Electrical Engineering, University of Connecticut, Storrs, CT. Three-phase wound-rotor synchronous motors are less popular than permanent magnet rotor synchronous motors due to the brushes required for the rotor field. Synchronous generators are much more common and available in most existing power plants, as they have excellent frequency and voltage regulation. Synchronous motors have the advantage of almost 0% speed regulation due to the fact that the rotor...
09:55
Preparation of Janus Particles and Alternating Current Electrokinetic Measurements with a Rapidly Fabricated Indium Tin Oxide Electrode Array
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Cited by 2 •
2017
In this article, a simple method to prepare partially or fully coated metallic particles and to perform AC electrokinetic property measurements with a rapidly fabricated indium tin oxide (ITO) electrode array is demonstrated.
10:27
VFD-fed AC Induction Machine
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2023
Source: Ali Bazzi, Department of Electrical Engineering, University of Connecticut, Storrs, CT. Variable frequency drives (VFDs) are a type of adjustable speed drive, which are becoming standard equipment to power most AC induction motors. VFDs are common in industrial and automation applications and typically provide robust control of the motor in speed, torque, or position modes. The VFDs tested and simulated in this experiment focus on speed and open-loop control with constant voltage to...
FAQs
Frequency shapes the electrical response of cells and suspended particles because polarization changes as the alternating field changes. At selected frequencies, that response can alter the magnitude or direction of electrically induced motion. Researchers therefore scan frequency while holding other conditions controlled to identify settings that enhance concentration, trapping, or separation in a microfluidic experiment.
These variables determine how strongly cells or particles respond to the applied field. Field strength affects the available electrical driving force, while medium conductivity and intrinsic cell properties influence polarization and motion. Controlling them is essential when comparing samples or interpreting whether differences in behavior reflect biological variation or altered experimental conditions.
Dielectrophoresis primarily describes forces acting on polarized cells or suspended particles, whereas induced-charge electro-osmosis results from interactions at electrode surfaces that generate fluid motion. The distinction matters experimentally: a platform may use particle forces to trap or separate cells, surface-driven flow to move fluid, or both effects together to control transport.
A typical workflow places the biological sample or particle suspension in a microfluidic system equipped with electrodes, applies an alternating electric field, and adjusts frequency, field strength, and medium conductivity. Researchers then evaluate the resulting cell or particle motion, using observed concentration, trapping, patterning, or separation to determine whether the chosen conditions meet the experimental goal.
The approach is useful when cells or particles must be manipulated without direct physical contact. In lab-on-a-chip systems, it can support cell sorting, concentration, trapping, patterning, and separation. These capabilities make it relevant to biological workflows that require controlled handling of small samples, particularly in diagnostics and experiments focused on individual cells.
A cell’s response to an alternating field depends partly on its electrical properties, so tracking its behavior under controlled frequencies and field conditions can provide characterization information. This makes the method relevant to single-cell analysis, where electrical responses may complement physical manipulation. The same platform can therefore support both separating cells and studying differences among them.