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I recently got a great question from our customers on how to measure zero shear viscosity with RheoSense viscometers. It is a fairly common misconception so I wanted to cover what zero shear viscosity.
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Key Words: Shear Rate Sweep, Shear Thinning, Viscosity, non-Newtonian Fluid, Automation, Newtonian, Characterization, Polymer, Oils
Goal: Serums are a popular self-care product to keep skin healthy. Formulation ingredients can vary dramatically. Some serums use plant-derived ingredients while others use synthetic oils depending on consumer preferences and needs. Thus, serum development is a dynamic process requiring a plethora of characterization experiments to differentiate between formulations. Here we demonstrate that the automated viscometer system, VROC® initium, can perform rate sweeps experiments to characterize different serum formulations based on their rheological properties with minimal engagement.
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A frequently asked question is, "what shear rates should I be using for my measurements?"
Back to Basics: Viscosity Fundamentals
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.
