We are happy to announce a new application note written by our very own, Research Scientist, Dr. Zachary Imam.
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.
A frequently asked question is, "what shear rates should I be using for my measurements?"
Key Words: Face lotion, hand lotion, cream, viscosity, shear thinning, cleaning, high shear, non-Newtonian fluid, protocol, thixotropy
Goal: Cosmetic lotions are often non-Newtonian fluids with yield stresses and thixotropic structure. These properties are vital for their function as self-care products, but also make their rheological properties difficult to characterize. In particular, data collection can be time consuming and instrument cleaning can be challenging. This application note will share an easy-to-implement protocol to precisely measure complex cosmetic formulations using VROC technology.
Working with various CROs and CDMOs, we've come to the question that many companies find themselves asking, "what is the cost of providing the wrong viscosity values to my customers and worse, having them submit the values for FDA approval?"
Our new application note is ready for download! As a sequel to our "Can Your Proteins Take the Heat," we have come out with part 2 where we go into further research on how varying pH with dilute proteins at varied temperatures can impact the viscosity. From there, viscosity values can be used to derive the protein to protein interaction and also the melting transition or protein denaturation process.
Recently, one of my customers brought up a concern that she had seen through other lab instrumentation during her experience in the lab. She asked how we deal with the particular evaporation effects of protein or other samples, especially when it comes to our VROC initium which handles 40 samples or up to 96 samples. So we put it to the test.