SAN RAMON, CA – August 7, 2020 – RheoSense, Inc. is proud to introduce the new VROC® initium one plus, the leading automatic viscometer that measures viscosity with the highest accuracy (2% of reading) and repeatability (0.5% of reading). Equipped with automatic sample loading and sample cleaning, VROC® initium one plus measures absolute viscosity as a function of shear rate across a wide temperature range (4 - 70°C), allowing for unique viscosity fingerprinting of your samples at our highest throughput, measuring up to 4 samples per hour.
When comparing viscometers, the primary differentiators are typically:
RheoSense has taken the design of our viscometers one step further with our patented VROC® (Viscometer-Rheometer-on-a-Chip) technology, combining microfluidic and MEMS (Micro-Electro-Mechanical Systems) technologies, allowing for complete characterization of viscosity as a function of shear rate or temperature. What may be the most differentiating feature of our VROC powered viscometers is their exceptional repeatability and accuracy which makes them the only viscometers available today with the necessary capabilities to provide intrinsic viscosity measurements.
In simplest terms, viscosity is defined as “the resistance to flow” and is often referred to as the thickness of a fluid. The concept of a fluid having a “thickness” has existed for thousands of years, however the term “viscosity” was not introduced until 1929. Even Newton referred to viscosity as “the lack of slipperiness of the parts of the liquid” (Sir Isaac Newton, Principia, 1687).
Cell culture media is essential for many in labs in academia, national laboratories, and the biotechnology industry. Cell culture media is vital for studying cellular processes, developing new drugs, and creating regenerative medicine (Yao and Asayama, 2017). Even emerging fields such as lab grown meat products require new types of media be developed and characterized (Gaydhane et al, 2018).
Last week, we hosted a webinar on the Weissenberg-Rabinowitsch-Mooney Correction, also known as WRM correction. What is this correction? When you are using a viscometer to measure viscosity of a liquid, there is more than just one number that comes out. Using a viscometer, you can determine if your sample is Newtonian or non-Newtonian.
Most fluids are non-Newtonian. What that means is that as the sample is exposed to shear rates, the viscosity can change (increase or decrease). Some samples display Newtonian behavior until a certain shear rate point where it changes the viscosity so it's imperative to be aware of all possibilities and expand your testing capabilities as wide as possible so you are prepared for all unknown.
When measuring non-Newtonian samples on rheometers and viscometers, such solutions often violate the assumptions programmed into the instrumentation. Diving deeper, the assumption that the change in shear stress over shear rate is linear would then be violated. However, there is a way to work with non-Newtonian samples in such cases by using the Weissenberg-Rabinowitsch-Mooney Correction (WRM).
The requested recording and presentation slides are ready to access from our webinar hosted by guest speaker, Dr. Gregory Sloop last week!
The viscosity of blood influences at least three variables: its ability to clot, perfuse tissue, and vascular resistance. An abnormally high blood viscosity can be an indicator of underlying health issues and a predictor of adverse events such as the following:
The vast majority of fluids in the world exhibit non-Newtonian behavior. So, knowing how to measure, correct, and handle non-Newtonian rheological data is vital for performing accurate and repeatable experiments and data analysis.
This application note will step through the commonly used Weissenberg-Rabinowitsch-Mooney (WRM) shear rate correction for non-Newtonian fluids, that way future experiments and data analysis can be done with peace of mind!
We have released a new application note on low viscosity fluids specifically by using an assortment of colognes.
Viscosity data for different colognes were obtained using microVISC™. Over the shear rates explored, 200 to 5,100 1/s, the colognes exhibited Newtonian behavior.
The viscosity of these colognes was found to be between 1.72 and 2.12 mPa-s. The primary ingredient was alcohol, but there were still up to a 20 % difference in the viscosity between the highest and lowest viscosity samples.
This result shows that formulations with similar base ingredients can still have a wide range of viscosities based on the other components of the formulation.