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Abstract |
We have developed a microviscometer analyzing the fluid dynamics in a single
channel glass microfluidic chip with a closed end. The device is able to test sample
volumes of a few microliters by inserting one drop in the inlet. The fluid enters the
channel driven by capillary pressure and an optical sensor registers the motion. The
equation that describes the fluid dynamics is function of the channel geometry,
atmospheric pressure, fluid viscosity and capillary pressure. Knowing the first two the
last parameters can be obtained as fitting parameters from the meniscus position as a
function of time plot. We have successfully tested Newtonian fluids with different
viscosities and capillary pressure. |
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