A chemically powered channelless microfluidic device was designed, fabricated, and characterized. The device consists of an asymmetric silver-gold bimetallic catalytic junction fabricated on a silicon dioxide surface. The decomposition of hydrogen peroxide at the silver-gold interface generates a proton gradient and an associated electric field which in turn drives electroosmosis and electrophoresis when a charged particle is present in the vicinity of the field. By engineering an asymmetric device consisting of an isolated junction, continuous electroosmotic fluid flow across the device has been achieved. In addition, a new device geometry has been developed which is capable of focusing and directing negatively charged particles along a desired path without the need of microchannels. The efficiency and ease of the fabrication suggest the possibility of many versatile applications including biological molecule sorting and manipulation.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Materials Chemistry