Electrowetting and Droplets

Electrowetting and Droplets, Fig. 1 Electrowetting liquid lens (Courtesy of Varioptic)... 

Electrowetting and Droplets, Fig. 3 Flow field model for droplet motion in a square pattern. The actual three-dimensional electrowetting flow will be substantially different than this model but is expected to display similar chaotic advection with dependence on the period of the cycle. The flow model here is a time-dependent, high-Peclet-number (low diffusion), two-dimensional Marangoni flow where the surface tension around the droplet periphery is varied in four phases (a) for the first quarter of cycle a = (ai -i- — (cji — cj2)cos(0)/2 (b)... 

Electrowetting and Droplets, Fig. 4 Poincare maps of a single tracer particle location after each of 6,400 periods of square pattern motion. The period of a complete cycle of the 4 flows from Fig. 1 is called T. Since we consider the droplet translation speed to be fixed, T can also be considered to be the size of the square pattern. The figures represent the Poincare maps for four different periods of switching (a) J = 4, (b)T=8, (c)r = 9,... 

Electrowetting and Droplets, Fig. 7 Boundary detection scheme applied to the acquired images. Raw images (a) are converted to grayscale (b) and threshold filtering to... 

Electrowetting and Droplets, Fig. 8 Phase portrait of droplet diameter and contact angle during AC excitation of voltage, V... 

Electrowetting and Droplets, Fig. 9 Snapshots of a 3 mL water droplet translating from over two neighboring 1 mm electrodes. pOTcing applied to the droplet was... 

Electrowetting and Droplets, Figure 2 Electrowetting-based cyan display with 160 pixels/inch (courtesy of LiquaVista)... 

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