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Creep Measurements of Microscale Hydrogel Particles Using a Microfluidic Extensional Flow Device
Creep Measurements of Microscale Hydrogel Particles Using a Microfluidic Extensional Flow Device
We are using the simple extensional flow device to recapitulate the standard creep test on hydrogel microparticles. Our approach is to use large channel dimensions relative to the size of the particle and operate at a relatively low flow rate to allow the particle to dwell near the stagnation point (zero velocity) where it experiences stretching extensional flow viscous forces.
Traditional uniaxial creep test
Traditional uniaxial creep test
Strain plateaus for a viscoelastic solid
Microfludic creep test in extensional flow
Microfludic creep test in extensional flow
Timelapse of a 40-µm agarose microparticle passing through the extensional flow region of a 300-µm wide, 200-µm deep microfluidic device
Millisecond timescale particle strain
Millisecond timescale particle strain
Our miniaturized, high-throughput microfluidic creep test achieves the steady stretch state (strain plateau.
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