Paper Number
PO123
Session
Poster Session
Title
Towards a comprehensive understanding of DWS microrheology analysis
Presentation Date and Time
October 12, 2022 (Wednesday) 6:30
Track / Room
Poster Session / Riverwalk A
Authors
- Li, Qi (University of Delaware)
- Dennis, Kimberly (University of Delaware, Department of Chemical and Biomolecular Engineering)
- Lee, Yu-Fan (University of Delaware, Chemical and Biomolecular Engineering)
- Wagner, Norman J. (University of Delaware, Chemical and Biomolecular Engineering)
- Furst, Eric M. (University of Delaware, Chemical and Biomolecular Engineering)
Author and Affiliation Lines
Qi Li, Kimberly Dennis, Yu-Fan Lee, Norman J. Wagner and Eric M. Furst
Chemical and Biomolecular Engineering, University of Delaware, Newark, DE 19716
Speaker / Presenter
Li, Qi
Keywords
experimental methods; colloids; rheometry techniques; suspensions
Text of Abstract
Diffusing wave spectroscopy (DWS) microrheology provides valuable information of viscoelastic properties that are often complementary to bulk rheology measurements. Its unique characteristics enable us to extend the limits of rheology, e.g. to high-frequency responses and under extreme conditions. As a method that takes advantage of multiple scattering, aspects like probe size, the convolution between self- and collective- motions probed, as well as the influence of structure and hydrodynamic factors complicate the data interpretation, leading to discrepancies between DWS microrheology and macroscopic rheological measurements. In this work, we focus on understanding what DWS is measuring in different experimental conditions, e.g. as a function of particle size relative to the laser wavelength, with the aim of constructing a comprehensive platform for accurately interpreting DWS microrheological data.