Paper Number
RS19 

Session
Techniques and Methods: Rheometry & Spectroscopy/Microscopy

Title
Protorheology: The first thing to do

Presentation Date and Time
October 12, 2022 (Wednesday) 10:10

Track / Room
Track 6 / Mayfair

Authors (Click on name to view author profile)

1. Hossain, Mohammad Tanver (University of Illinois at Urbana-Champaign, Department of Mechanical Science and Engineering)
2. Ewoldt, Randy H. (University of Illinois at Urbana-Champaign, Mechanical Science and Engineering)

Author and Affiliation Lines (in printed abstract book)
Mohammad Tanver Hossain and Randy H. Ewoldt
Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801

Speaker / Presenter 
Ewoldt, Randy H.

Keywords
experimental methods; consumer products; food rheology; rheometry techniques

Text of Abstract
Protorheology is the first thing everyone does to assess rheological properties: poke, stir, scoop, drip, pile, and observe. Here we survey protorheology tests that provide visual evidence of key rheological phenomena and allow quantitative estimates of properties. Tests are grouped according to which rheological phenomenon is revealed (e.g. shear-thinning viscosity, viscoelasticity, normal stress differences in shear, extensional viscosity). Case studies show how protorheology enhances measurement with rheometers. It provides insight for choosing test conditions, consistency checks to avoid bad data, and context for interpreting results. These methods compose a collection of recipes for “do-it-yourself” rheometry that is useful for instruction, research, and broader technical communication.