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Related Experiment Video

Updated: Jun 19, 2026

Preparation of Janus Particles and Alternating Current Electrokinetic Measurements with a Rapidly Fabricated Indium Tin Oxide Electrode Array

Preparation of Janus Particles and Alternating Current Electrokinetic Measurements with a Rapidly Fabricated Indium Tin Oxide Electrode Array

Published on: June 23, 2017

Lateral displacement as a function of particle size using a piecewise curved planar interdigitated electrode array.

Ki-Ho Han¹, Song-I Han, A Bruno Frazier

¹School of Nano Engineering, Inje University, Obang-dong, Gimhae, GyongNam, 621-749, Republic of Korea. mems@inje.ac.kr

|October 1, 2009

Summary

We developed a lateral dielectrophoretic (DEP) microseparator to continuously separate particles by size. This device effectively discriminates between 3-, 5-, and 10-micrometer beads using lateral DEP force.

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Published on: June 23, 2017

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Area of Science:

Microfluidics
Particle Separation
Dielectrophoresis

Background:

Particle size influences lateral displacement over interdigitated electrodes.
Understanding this displacement is key for developing size-selective separation methods.

Purpose of the Study:

To develop a microfluidic device for continuous, size-based particle separation.
To investigate the relationship between particle size, angle, and lateral displacement.

Main Methods:

Utilized a simplified line charge model for numerical estimation of lateral displacement.
Designed a lateral dielectrophoretic (DEP) microseparator with angled electrode arrays.
Applied AC voltage to generate lateral DEP force for particle manipulation.

Main Results:

Demonstrated continuous separation of 3-, 5-, and 10-micrometer polystyrene beads with high efficiency (98-99%).
Achieved separation using a 200-kHz, 12-Vp-p AC voltage.
Lateral displacement was confirmed as a function of particle size and electrode angle.

Conclusions:

The lateral DEP microseparator is a practical and effective tool for simultaneous size-based particle separation.
This technology enables efficient discrimination of particles from heterogeneous mixtures.