My purpose was to find a viscometer that performed quickly, gave repeatable results, that agrees with the viscosity we measure in another department. I have used this for over 500 pure chemicals at this point. What Dave may have told you, that I can vouch for, is that we achieve triplicate measurements in under 2 minutes, with less than an entire pipette volume of 400 µL. The measurements are very repeatable. The portability and ease of use are terrific. The temperature is recorded, with 2 decimals of precision. I have used the software and found it good enough to copy and paste into Excel, easily. Or import a .CSV.
If you want to fully characterize the viscosity under a variety of temperatures and stress and strain conditions, then you’ll need a research grade expensive rheometer. I find that this microVISC™ does a wonderful job of distinguishing viscosity, the range I’m interested in is 5 – 1000 cP. Very often people need to know the viscosity at room temperature, and I love it when a single-purpose instrument is accurate, reliable, and affordable. The microVISC™ is all of those, and portable.
BTW, it has survived some pretty nasty chemicals. Also it’s so easy to use (load and press start), that summer interns have used it and produced low %RSD results.
- A large Swiss fragrance company
"I would like to mention (m-VROC®) is great instrument and I am really enjoying using it."
– Mahoom Fard, Canopy Growth
"Darn, that little thing works great [microVISC]. Good job! I did a couple of known control samples, which measured bang-on exact with literature values. And then had no difficulties with my biological materials."
– David Krevor, Ph.D.
"The trends in the viscosity data acquired with the microVISC™ across different temperatures and concentrations follow those seen in other studies [1-4]. Combined with the trends in activation energy found from data fitted to an Arrhenius model shows that the viscometer can deliver reliable temperature dependent viscosity data."
– Gregory E. Ogden, Ph.D., The University of Arizona
"At Arizona State University, our research focuses on developing ink chemistries for additive manufacturing from the nanometer to the centimeter scales. To achieve this goal, we must precisely control the rheology properties of our inks. The RheoSense microVISC™ has been instrumental in our lab to measure and monitor the viscosity of our research inks throughout the day. The tool is extremely simple to use and its small sample volume saves money for some of the more expensive inks. Additionally, the use of affordable, disposable syringes saves us considerable time compared to cleaning a traditional rheometer ten times a day.
Overall, we would recommend this tool to other groups looking for an easy-to-use rheometer for daily lab use. "
– Professor Owen Hildreth, Arizona State University
"In brief, we used the RheoSense to measure the viscosity of cellular suspensions. Our goal was to determine the dilution factor needed for the cell suspension to match a running buffer. As demonstrated in the graph this happens around a 10 fold sample dilution factor. Consistent sample viscosity will enable CytoVale to develop robust cellular assays for our core applications involving the high throughput mechanical measurement of cells.
The RheoSense viscometer enabled us to quickly and accurately measure small aliqouts of sample which was necessary due to limited amounts of biological material. Additionally the low volume allowed us to gather many replicates of data in order to accurately assess biological variability between and across samples. This capability allowed us to have much more robust data collection and higher sample sizes for each point on the curve as compared to using traditional capillary viscometry. "
– Annie Jensen, Cytovale
"Microfluidic devices offer several advantages compared to conventional rheometers in that they only require small volumes of fluid sample, they can impose high deformation rates without entering strongly inertial flow regimes, the absence of a free surface avoids evaporation, and they can potentially be used as a simple, disposable flow-through device."
– MIT's Gareth McKinley, Ph.D., and Chris Pipe, Ph.D.
"The VROC® provides more measurement than conventional viscometers. This additional measurement is a key part in understanding the properties of polymers made by CP Kelco. It is capable of making measurements not possible with other instruments. Rotational instruments fail to deliver accurate measurements at these high shear rates and the capillary flow method is preferred. The ability of the RheoSense instrument to measure very small sample quantities is also useful. We have found the instrument to be accurate and reliable."
– Ross Clark, Ph.D., Distinguished Research Fellow at CP Kelco
"Capabilities of these VROC® chips are definitely a valuable tool and get a lot of good use. I appreciate RheoSense's responsiveness to our equipment maintenance needs"
– Barry Vomocil, Ph.D., at Hewlett Packard
"I want to thank you both for all the work you did to get such a quick turn around on this. We have already had a chance to test this out, and it is proving to be extremely useful for our processes. Thank you again.."
– Michael J. Forrester, Iowa State University