Electrowetting Fundamental Principles And Practical Applications -

Electrowetting has traveled a remarkable arc from a 19th-century curiosity to a 21st-century engineering tool. Its core principle—using electricity to tame surface tension—unlocks a unique combination of properties: no moving parts, fast response, low power, and precise digital control of fluids.

Electrowetting refers to the modification of the wetting properties of a liquid on a solid surface through the application of an electric field. By applying a voltage, one can change the contact angle of a droplet, effectively making a hydrophobic surface behave as if it were hydrophilic. This reversible control over surface tension enables a host of applications, from liquid lenses in smartphone cameras to digital lab-on-a-chip devices for biomedical diagnostics. Electrowetting has traveled a remarkable arc from a