Fig. 4: The radius of the occluding bubble, as determined by the test device. | Microsystems & Nanoengineering

Fig. 4: The radius of the occluding bubble, as determined by the test device.

From: Capillaric field effect transistors

Fig. 4

a Optical micrographs showing the shape of the occluding bubble for 36 cFETs with trigger channel volumes varying from 5.7 to 40.7 nL (top to bottom, right to left). Occluding bubbles contact the main channel wall, and thus pinch-off fluid flow, at a volume of approximately 26 nL. The shape of these bubbles was used to calculate main channel capillary pressure as function of displaced volume. b Plot of the occluding bubble radius as a function of displaced volume. A circular arc was fitted to each meniscus/bubble shown in a using a gradient descent fitting algorithm. Each point represents the radius of an arc that was fitted to the meniscus shape. Outliers are indicated as red triangles. Inset shows an example of the circular arc fitting (line) against the extracted meniscus shape (X), overlaid onto an image of the meniscus

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