Results: 2

1.
FIG. 1

FIG. 1. From: Electrical microfluidic pressure gauge for elastomer microelectromechanical systems.

Device Architecture. A two-layer PDMS device is bound to a glass slide with chrome contacts in such a way that each pair of electrodes is matched to a short transverse segment of the lower-layer microchannel (blue dye, normally filled with salty buffer) (A). The upper-layer channel (red dye, normally filled with de-ionized water) forms an array of microfluidic pushdown valves of different dimensions (note valve length increasing from left to right in the picture) (B) and thus different characteristic closing pressures (Ref. 14).

Emil P. Kartalov, et al. J Appl Phys. ;102(8):84909-849094.
2.
FIG. 2

FIG. 2. From: Electrical microfluidic pressure gauge for elastomer microelectromechanical systems.

Device Function. Each valve closes when the applied pressure exceeds the valve’s characteristic pressure. Thus the status of each valve determines applied pressure to an upper or lower bound. Then the status of a heterogeneous set of valves produces an interval estimate of the applied pressure. The electrical resistance of the electrolyte-filled channel segment under each valve [see Fig. 1(b)] increases drastically if and only if the valve is closed, so valve status is measured electrically. The overall device is utilized as a microfluidic pressure gauge with electrical readout. The experimentally measured resistances of the elements of the array are plotted as a function of applied pressure. (The upper limit of the multimeter scale is 2 GΩ, so the actual resistance of the fluidic seal is higher.)

Emil P. Kartalov, et al. J Appl Phys. ;102(8):84909-849094.

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