It has been a fairly busy week! Since I took a good amount of time to work on a video introducing rheology for my Using Digital Media class at Stony Brook University (and I am not sure if I can post it because of some copyright issues), I will post some resources here about rheology. Before starting my PhD, I knew that scientists and engineers performed materials testing and I had thought that all was part of materials science. I did not know that there was a whole science dedicated to specifically how a material behaved after it was deformed and that materials could not be simply defined as being either a solid or liquid.
After the 5 weeks it takes to prepare my multicomponent hydrogels, I have to test it to study its mechanical properties since I am trying to increase its mechanical strength by varying the concentration of my gels. The primary tool that I use to study my gels is with a rheometer.
Rheology comes from the Greek word ‘rhein’ meaning ‘to flow.’ It is defined as the science of deformation and flow and helps to unify our study of all materials. We usually say that something is usually liquid or solid, and describe differences between liquids with differing degrees of viscosity (resistance to flow) and between solids with different elasticities (the tendency of solid materials to return to their original shape after being deformed). However, most materials can neither be solely defined as being either liquid or solid and lie in a spectrum between the two. These materials fall under the term viscoelastic and rheology can be used to study viscous, elastic and viscoelastic materials.
Since rheology is a interdisciplinary field that combines math, the physical sciences, engineering and medicine, it requires an understanding of how materials behave as well as a practical knowledge of how rheology can be used.
I have listed some sources below that I have found to be very useful:
ISBN-13: 978-3866308640 ISBN-10: 3866308647
The following from Anton Paar’s e-learning,introduces the very basic principles of rheometry:
I also came across this gem, which is a lecture/demonstration by Hershel Markovitz in the 1950s:
After watching some of these films, I immediately felt a little jealous of all the demonstrations that were done in classes back then.
I will post an update when I find more useful resources. If you find any book, article, or video that can help us develop a better understanding of rheology, feel free to share below in the comments.
Thanks for checking back!