Paper Number
GR1 

Session
Gallery of Rheology Contest

Title
Stringing beads in polymer wormlike micelle solutions

Presentation Date and Time
October 12, 2022 (Wednesday) 6:30

Track / Room
Gallery of Rheology / Sheraton 1

Authors (Click on name to view author profile)

1. Zhang, Diana Y. (University of Minnesota, Chemical Engineering and Materials Science)
2. Calabrese, Michelle A. (University of Minnesota, Chemical Engineering and Materials Science)

Author and Affiliation Lines (in printed abstract book)
Diana Y. Zhang and Michelle A. Calabrese
Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455

Speaker / Presenter 
Zhang, Diana Y.

Keywords
colloids; flow-induced instabilities; polymer solutions

Text of Abstract
Using temperature-controlled dripping-onto-substrate (TC-DoS) rheometry, we observed the beads-on-a-string (BOAS) instability in a thermoresponsive polymer wormlike micelle (WLM) solution comprised of 4% wt poloxamer 84 (P84) in 0.9 M NaF/D2O. The spherical P234 micelles at ambient conditions lengthen into WLMs with increasing temperature. At a temperature of 39 °C, the WLM solution exhibits exceptionally slow dynamics that enable the visualization of BOAS instability formation and evolution.