DIELECTROPHORESIS

Neutral Particle Motion in Non-Uniform Electric Fields
F_DEP = 2πr³ε_m Re[K(ω)] ∇|E|²    K(ω) = (ε*_p − ε*_m)/(ε*_p + 2ε*_m)
Voltage (V) 40 V
Frequency (MHz) 1.0 MHz
Mode
Particle Count 60
Dielectrophoresis (DEP): a non-uniform field induces a dipole in neutral particles. If particle permittivity > medium (positive DEP, high Re[K]), particles drift to field maxima (electrodes). Negative DEP: particles repelled to field minima. Used to sort cells, trap nanoparticles, and concentrate biomolecules.