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Related Concept Videos

Electrochemical Systems01:24

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
Induced Electric Fields01:23

Induced Electric Fields

The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
Electric Field of Two Equal and Opposite Charges01:30

Electric Field of Two Equal and Opposite Charges

Atoms generally contain the same number of positively and negatively charged particles, protons, and electrons. Hence, they are electrically neutral. However, the centers of the positive and negative charges do not always coincide. In such a scenario, the electric field of an atom may not be zero.
A separation of the positive and negative charges can lead to a weak, remnant effect of the positive and negative charges. The expectation is that the more the distance between the positive and...
Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity.
Capillary Electrophoresis: Instrumentation01:20

Capillary Electrophoresis: Instrumentation

Capillary electrophoresis instrumentation typically consists of several key components. A high-voltage power supply generates the electric field necessary for the separation by connecting to an anode (the positively charged electrode) and a cathode (the negatively charged electrode) located in buffer reservoirs at each end of the capillary tube. The system includes a sample vial, a fused silica capillary tube coated with polyimide for mechanical strength through which the sample components...

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Updated: Jun 10, 2026

Separating Beads and Cells in Multi-channel Microfluidic Devices Using Dielectrophoresis and Laminar Flow
09:45

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Published on: February 4, 2011

Optoelectrofluidic field separation based on light-intensity gradients.

Sanghyun Lee1, Hyun Jin Park, Jin Sung Yoon

  • 1Department of Mechanical Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, Pohang 790-784, South Korea.

Biomicrofluidics
|August 11, 2010
PubMed
Summary
This summary is machine-generated.

Optoelectrofluidic field separation (OEFS) uses light-intensity gradients to convert short-range dielectrophoresis forces into long-range ones. This enables efficient particle separation and concentration across the entire working area.

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Area of Science:

  • Optoelectrofluidics
  • Particle Manipulation
  • Microfluidics

Background:

  • Dielectrophoresis (DEP) forces are typically short-ranged.
  • Particle separation in microfluidic devices often faces limitations due to short-range forces.
  • Existing methods may struggle with manipulating particles over large areas.

Purpose of the Study:

  • To introduce and demonstrate Optoelectrofluidic Field Separation (OEFS) using light-intensity gradients (LIG).
  • To convert short-ranged DEP forces into long-ranged forces for enhanced particle manipulation.
  • To achieve effective particle separation and concentration over an entire working area.

Main Methods:

  • Utilizing LIG illumination on a photoconductive layer to generate long-ranged DEP forces.
  • Employing alternating current electro-osmosis (ACEO) to counteract hydrodynamic forces.
  • Implementing a codirectional illumination and observation strategy to induce a levitation effect.

Main Results:

  • Demonstrated effective field separation and concentration of diverse particle pairs (0.82-16 µm).
  • Showcased the conversion of short-ranged DEP to long-ranged DEP via LIG.
  • Observed a levitation effect that compensates for DEP force attenuation under LIG.

Conclusions:

  • OEFS with codirectional LIG is a viable strategy for particle manipulation.
  • This method offers rapid manipulation of biological cells and particles over large areas.
  • The study discusses critical radii and conditions for effective particle manipulation.