The role of electro-osmosis and dielectrophoresis in collection of micro/nano size particles in low frequency AC electric field

Chehung Wei; Che-Wei Hsu; Ching-Chieh Wang

doi:10.1117/12.735185

11 September 2007 The role of electro-osmosis and dielectrophoresis in collection of micro/nano size particles in low frequency AC electric field

Chehung Wei, Che-Wei Hsu, Ching-Chieh Wang

Author Affiliations +

Proceedings Volume 6645, Nanoengineering: Fabrication, Properties, Optics, and Devices IV; 664528 (2007) https://doi.org/10.1117/12.735185
Event: NanoScience + Engineering, 2007, San Diego, California, United States

Abstract

The collecting and sorting micro size particles by electric force is easy to integrate with other bioassays. There are many forms of electric forces such as electrophoresis, dielectrophoresis and electroosmosis which can be used to manipulate particles. In an attempt to understand the role of electroosmosis and dielectrophoresis in the collection of micro size particles, a small device made of two parallel plates is used to study the particle movement under AC electric field. The device is fabricated by a top electrode and a bottom electrode separated by a spacer. The top electrode is made from an ITO glass where the bottom electrode is made of Corning 1737 glass sputtered with chromium. A dielectric layer is fabricated by spin coating a thin photo-resist (0.5~1μm) on the bottom electrode and a spacer made of curing PDMS is utilized to separate these electrodes. A 900μm × 900μm collecting chamber is fabricated on the bottom electrode via photolithography. The amine-modified polystyrene fluorescent particles whose average size is 1 μm were used for collection experiments. Different frequency and power were applied to generate the non-uniform electric field. It was found that frequency is the critical factor for electroosmotic velocity. There seems to be an optimum frequency that leads to largest particle velocity. The underlying mechanism is believed to the competing forces among dielectrophoresis and electroosmosis. This device demonstrates that the electroosmosis force is suitable for collecting bio-particles in AC electric field.

Citation Download Citation

Chehung Wei, Che-Wei Hsu, and Ching-Chieh Wang "The role of electro-osmosis and dielectrophoresis in collection of micro/nano size particles in low frequency AC electric field", Proc. SPIE 6645, Nanoengineering: Fabrication, Properties, Optics, and Devices IV, 664528 (11 September 2007); https://doi.org/10.1117/12.735185

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available