Unlocking 100 ˚C Viscosity Measurement with m-VROC II
The m-VROC® II is now capable of measuring viscosity across a wide temperature range, from 4˚C to 100˚C. Certain samples, such as engine oil or 3D printing materials, necessitate testing at temperatures exceeding 80˚C. Even samples that are solid at room temperature but transition to a liquid state at elevated temperatures can be tested and analyzed with the m-VROC II.
Highlighted features of the instrument include:
- Ability to test small sample quantities repeatedly, thanks to the microfluidics and the sample retrieval feature
- High accuracy, ±2%, and excellent repeatability, ±0.5%
- Precise temperature control with Peltier technology
The plot here illustrates viscosity results obtained for a paraffin wax 3D printing material with a melting temperature of 60-70 ˚C. Consequently, while the sample remains solid at room temperature, it becomes liquid above ~60 ˚C, enabling viscosity measurement with VROC technology.
The test procedure involved the following steps:
2. Back-loading 80 µL of the sample into the 100 µL test syringe using a positive displacement pipette.
3. Equipping the m-VROC II unit with a B05 chip to conduct measurements on the sample at temperatures of 80 ˚C and 96 ˚C, with three repeats at a fixed shear rate (automatic measurement protocol), retrieving the sample when necessary.
4. Performing pre-CCS cleaning twice using heptane. Each time, 100 µL of heptane was loaded into the syringe and run at 80 ˚C to remove any residual sample from the chip.
5. Utilizing the Chip Cleaning Station (CCS) for the final cleaning of the chip and reservoir with the oil cleaning protocol.
We obtained three viscosity readings at each temperature using only 80 µL of sample, demonstrating the superior repeatability. The average viscosity was measured as 11.73 cP at 80 ˚C, and 8.19 cP at 96 ˚C.
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