1 / 6

Particle Dielectrophoresis Modeling in COMSOL 4.2a

Particle Dielectrophoresis Modeling in COMSOL 4.2a. Model definition. Electric field:. Particle trajectories:. F D – drag force F g – gravitational force F DEP – d ielectrophoretic force.

badrani
Download Presentation

Particle Dielectrophoresis Modeling in COMSOL 4.2a

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Particle Dielectrophoresis Modeling in COMSOL 4.2a

  2. Model definition Electric field: Particle trajectories: FD – drag force Fg – gravitational force FDEP – dielectrophoretic force The modeled domain. The red electrodes are set to 10 V (AC) and the blue electrodes are set to ground (0 V). • Buffer properties: • conductivity 0.56 S/m, relative permittivity 78 • Alternating currents (AC) • Peak potential 10V • frequency 10 Hz • Modeling domain 30um x 30um x 30um • Particle density 1050 kg/m3, radius 500nm • pDEP group: conductivity 0.95 S/m, relative permittivity 36 • nDEP group: conductivity 0.01 S/m, relative permittivity 2.55

  3. Dielectrophoretic Force The dielectrophoresis force can be determined from the electric field by Complex permittivity of medium Complex permittivity of particles The sign of the DEP force depends on Clausius-Mossotti factor : Two groups of particles are released from the mid-plane of the domain: one group with pDEP and one group with nDEP. Positive DEP (pDEP), particles attracted to the regions of high electric field magnitude. Negative DEP (nDEP), particles repelled from the regions of high electric field magnitude.

  4. Dielectrophoretic Force • Use the electric field calculated from the electric current interface to compute the DEP force. • Type in the complex relative permittivity of the particles and the buffer. • Activate ‘Use piecewise polynomial recovery on field’ to improve the accuracy of force calculation.

  5. Particle Release Release the particles from the mid-plane of the domain

  6. Results and Discussions • The particles (red) with positive Clausius-Mossotti factor (fCM= 0.19) are attracted to the high field region. • The particles (blue) with negative Clausius-Mossotti factor (fCM= -0.49) are repelled from the high field region. High field region

More Related