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e-VROC Viscometer
e-VROC® Viscometer - Extensional Viscosity

the viscometer capable of measuring apparent extensional viscosity, measures the extensional flow of polymer solutions to help you understand and optimize your industrial processes. By monitoring the sample flow through a microfluidic contraction within the measuring cell, e-VROC® provides precise apparent extensional viscosity data.

Because extensional flows greatly impact the behavior of polymer molecules and asymmetric particles, understanding extensional viscosity allows you to improve your industrial processes. With accurate data, you can gain a deep understanding of the composition of the fluid, predict the impact of that composition on your process, and optimize your process based on the characteristics revealed by the data.

e-VROC®, built with RheoSense’s patented VROC® technology, is an excellent tool for measuring both the extensional and shear viscosities simultaneously.

The viscometer 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 apparent extensional viscosity.

e-VROC® chip is engineered with a microfluidic 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.

e-VROC Viscometer
Technical Specifications:
  • Minimum Sample Volume: 500 µL
  • Wide Dynamic Viscosity Range: 1 to 2,000 mPa-s
  • Temperature Rate: 4 °C to 70 °C
  • Temperature Stability: ~ +/- 0.07 °C
  • Extensional Rate: 0.1 to 1,000 s-1
  • No Evaporation
  • No Air-Liquid Interface
  • Characterization of Newtonian and Non-Newtonian Solutions
  • Accuracy: up to 2% of Reading
  • Repeatable Measurement: up to 0.5% of Reading
Applications: e-VROC Viscometer - Extensional Viscosity
e-VROC® is a good choice for the measurement of fluids with certain extensional viscosity properties, such as polymer applications, which exhibit thickening beyond the Trouton ratio found for Newtonian fluids.
Applications include:
  • Fiber Spinning
  • Paint Rolling
  • Roll Coating
  • Inkjet Printing
  • Spraying
    • Electrospinning
    • Enhanced Oil Recovery
    • Drag Reduction
    • Food Processing
          Chip Cleaning Station
          The chip cleaning station allows for a selection of 3 different solvents along with cleaning protocols.

          All of this is accessible with a built-in touch screen display.

          • 3 Solvent Bottles for optimized cleaning
          • Easy Operation: Touch screen user interface
          • One button for running the cleaning
          • Run factory cleaning protocols or customize

          Technical Specifications:
          • Solvent Bottles: 3
          • Dimensions (without solvent bottles): 231 x 231 x 153 mm
          • Power Consumption: 50 W
          • Weight (without solvent bottles): 2.3 kg
          • Power Supply: 220 V

          m-VROC Chip Cleaning Station
          (1) Download Leaflet: e-VROC Viscometer

          (EN; 533 KB)
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