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Extensional Viscosity Chip

Viscometer Specifications 

Minimum Sample Volume 500 μL
Viscosity Range 10 - 2,000 mPa-s
Extensional Rate 0.1 - 1000 s-1
Temperature Range 4 - 70 °C
Temperature Stability ~+/- 0.07 °C
Extensional Viscosity Yes
Accuracy ~+/- 0.5% Reading
Shear Sweeps Yes
Temperature Sweeps Yes
Typical Test Time <1 min

Want to Learn more about Extensional Viscosity?

Read more!

Want to learn about how extensional deformation or shearing has such a significant impact on industrial processes? Interested in what happens when you compare Xanthan and HPAM Solution Extensional Viscosity for enhanced oil recovery?

View our Application notes!

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Viscometer Principle 

The e-VROC™ chip is engineered with a microfluid channel of uniform width and depth. It has hyperbolic contraction/expansion zone in the middle of the channel and four monolithically integrated MEMS pressure sensors (two in the upstream and two in the downstream of the contraction/expansion zone). A liquid entering the channel first experiences shear flow in the straight channel and then experiences a uniform extension in the contraction zone as illustrated by the elongational shape change of the square in the schematic below. 





Compared to other methods of extensional viscosity measurement, e-VROC™ allows the measurement of extensional viscosity at high extensional rates. The system measures the pressure upstream and downstream of a contraction using the MEMS pressure sensors, and it registers changes in the flow. The fluid undergoes an almost constant extension through the contraction/expansion, enabling the calculation of the extensional viscosity

Testing a Sample with e-VROC™ Viscometer

Step 1: Load the syringe with your sample
Step 2: Tighten the syringe into the chip enclosure and secure it inside the thermal jacket
Step 3: Bring down the top of the thermal jacket enclosure and lock it by turning the black thumb screw clockwise— you are ready to measure your sample!