Ionic liquids provide new temperature controls
Ionic liquids provide new temperature controls.
Now, Andrew de Mello and colleagues at Imperial College London, UK, have exploited the effect in ionic liquids to control precisely the temperature of localised areas in microfluidic chips. By applying alternating current to an ionic liquid in a channel parallel to one requiring heating, specific areas of a microfluidic system can be controllably heated. Heating can be fast or slow, depending on the voltage applied, and the easily-fabricated microdevices are completely transparent, making it easy to view samples. The team expects the approach to be particularly useful in applications where temperature cycling is needed, such as polymerase chain reactions.
A J de Mello et al, Lab Chip, 2004 (DOI: 10.1039/ <MAN>b405760k</MAN>)