Numerical study on dielectrophoretic chaining of two ellipsoidal particles

Area of Science:

• Physics
• Materials Science
• Biotechnology

Background:

• Electric field-induced particle assembly is vital for fabricating diverse materials.
• Understanding dielectrophoretic (DEP) interactions is key for non-spherical particles.
• Current knowledge of DEP interactions for general particle shapes is limited.

Purpose of the Study:

• To numerically investigate the dielectrophoretic interaction between two prolate spheroid particles.
• To analyze the effects of initial configuration and aspect ratio on particle behavior.
• To elucidate the fundamental mechanisms behind particle chaining.

Main Methods:

• Utilizing the boundary-element method (BEM) to solve coupled electric field, Stokes flow, and particle motion.
• Calculating DEP forces by integrating the Maxwell stress tensor over particle surfaces.
• Simulating the transient behavior of two suspended prolate spheroid particles.

Main Results:

• Observed particle self-rotation (electro-orientation) during translation.
• Demonstrated the formation of particle chain pairs.
• The transient behavior and interactions mimic experimental observations of ellipsoidal particle chaining.

Conclusions:

• The numerical simulation provides fundamental insights into the dielectrophoretic interaction of non-spherical particles.
• The study explains the electro-orientation and chaining phenomena observed in experiments.
• This work advances the understanding of electric field-induced assembly for advanced material fabrication.