Elektrowetting
Contents
Introduction
- Electrical charge of the surface changes the shape of water drops (before 1875)
- Electrowetting is the modification of the wetting properties of a surface by applying different electric fields (1981)
- "fluid transistor" for manipulating chemical and biological fluids (1980)
- Electrowetting on this dielectric-coated surface, EWOD (1993)
- Digital Microfluidic Circuits
What you need:
- insulating dielectric and hydrophobic layers
- immiscible fluids
- DC or RF power
- mass arrays of miniature interleaved electrodes (Indium tin oxide (ITO))
- digital control
- nano droplets
What you can do:
- move droplets in linear, circular and directed paths
- pump fluids
- mix fluids
- fill reservoirs
- move droplets over sensors or heaters
- control fluid flow electronically or optically
source: http://en.wikipedia.org/wiki/Electrowetting
Electrowetting_TFT [1]
DIY experiment
What you need:
- ribbon cable
- water, oil
- high voltage (how high? Amperage? will 80v do?)
What you can do:
DIY Designs
Miri PCB Electrode Design
Fluxology
FluxMux-Device
Based on two crosswise flat ribbon cable the FluxMux device is an easy way to create a digital microfluidic device. An array of power leds shines through the grid to make drops visible.
The control is multiplexed.
Flux Technologies
comming soon...
Bio Device
Surface Coating
Electronic Control
[1,2,3]
Visit to DropBot @ Helsinki University
== DigiFlux Shield ==file:///media/gaudi/CANON_DC/DCIM/124___03/IMG_7383.JPG
Layouting first prototype of DigiFlux with array of fluxels
Etching some prototype shields.
Spin-coating with PDMS and teflon
Intense fluxing (hacking session)
Embedding the fluxel device in a fancy German box
File:fluxel incubated.JPG
Incubating cells on the fluxel device
Growing cells overnight
References
Fast Fabricating Electrowetting
Low Cost PCB Digital Microfluidic
Videos
On chip Sample preparation utilising EWOD Concept
DNA Lab on a Chip
Sandia Digital Microfluidic Hub
The Electrowetting Display
AM-(TFT-)EWOD
Article on AM-(TFT-)EWOD
Patents
1 Toward active-matrix lab-on-a-chip: programmable electrofluidic control enabled by arrayed oxide thin film transistors†
Joo Hyon Noh, a Jiyong Noh, a Eric Kreit, b Jason Heikenfeld b and Philip D. Rack
2 Electrowetting: from basics to applications, Frieder Mugele 1,3 and Jean-Christophe Baret
3 Programmable large area digital microfluidic array with integrated droplet sensing for bioassays, B. Hadwen, a G. R. Broder, b D. Morganti, b A. Jacobs, a C. Brown, a J. R. Hector, a Y. Kubota c and H. Morgan* b
