Microfluidic Viscosity Measurements
Track resistance to flow on multiple samples from just microliters
Go with the flow
Feel the pressure
Push it real good
Load up a sample into the microfluidic input well and apply some pressure. The sample flows into the resistance channel (R) first – where the height is so tiny that it provides essentially all the resistance to flow in the whole channel.
When the flow makes its way to the measurement channel (M), the flow rate is still determined entirely by the R channel – but now the dimensions are a lot bigger so the flow rate can be measured by video.
Do the math
To measure viscosity, you need to know both shear stress and shear strain. Keep pressure constant and you’ve got the key factor to determine shear stress.
Keep track of how fluid flows through known geometries and you can figure out the flow rate and ultimately the shear rate.
Once you know those metrics, a little division and you’ve got viscosity.
See what’s trending
If applying pressure and measuring flow rate gives you viscosity, all you need to do is run several samples to check out how concentration or formulations impact your sample's viscosity and Newtonian or Non-Newtonian behavior.