Thursday, July 11, 2013

1307.2681 (Ranabir Dey et al.)

Electrowetting-on-dielectric (EWOD) of sessile liquid drops on
rheologically tuned soft surfaces

Ranabir Dey, Sunando DasGupta, Suman Chakraborty
The Young-Lippmann equation does not address the influence of mechanical properties of the dielectric layer, like elasticity, on the electrowetting behaviour of sessile liquid drops, within the classical electrowetting-on-dielectric (EWOD) framework. Here, we show for the first time, the alterations in the electrowetting response of conductive liquid drops over rheologically tuned soft surfaces. The influence of decreasing dielectric elasticity on the electrowetting behaviour is experimentally demonstrated by delineating the variations in apparent contact angle, and contact radius, over a complete electrowetting cycle, for substrates with varying elasticity. The significant effects of surface softness, on the electrowetting phenomenon, are explained by taking in purview the liquid-substrate interfacial interactions, as dictated by surface elasticity.
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