Paper Number
FE18 

Session
Foams, Emulsions, Surfactants, and Micelles

Title
Why can we measure interfacial rheology for some polymers at the A/W interface and not for others?

Presentation Date and Time
October 12, 2021 (Tuesday) 11:05

Track / Room
Track 3 / Meeting Room A-B

Authors (Click on name to view author profile)

  1. Ashkenazi, Daniel (Ben Gurion University, Chemical Engineering)
  2. Alexandris, Stelios (FORTH, IESL)
  3. Vlassopoulos, Dimitris (IESL-FORTH and University of Crete)
  4. Gottlieb, Moshe (Ben Gurion University, Chemical Engineering)

Author and Affiliation Lines (in printed abstract book)
Daniel Ashkenazi1, Stelios Alexandris2, Dimitris Vlassopoulos2 and Moshe Gottlieb1
1Chemical Engineering, Ben Gurion University, Beer Sheva 8410501, Israel; 2IESL, FORTH, Heraklion, Crete, Greece

Speaker / Presenter 
Gottlieb, Moshe

Keywords
experimental methods; interfacial rheology; rheology methods; surfactants

Text of Abstract
Polymer laden fluid interfaces play a crucial role in many biological and industrial process. Exploration of the still poorly understood interplay between polymer molecular characteristics, polymer organization at the interface, and their effect on the mechanical properties of the interface is a prerequisite for a proper design for multitude of interface dominated processes. Several instruments have been developed over the year for the measurement of the interfacial shear rheology. The magnetic needle device, the double wall ring, and the bicone are the most frequently used. Detailed studies have been carried out concerning the operation of these devices (e.g., D. Renggli et al. J. Rheol. 2020, 64, 141). Taking advantage of the understanding that has been developed over the years it is possible to characterize the interfacial rheology of some polymer-loaded interfaces while it is not accessible for others. In this talk we would like to identify the characteristics that prevent the measurement of interfacial rheology of some polymers and make it possible for others. A combination of classical rectangular Langmuir-Pockels trough, Brewster's angle microscopy for morphology and layer thickness determination, and different shear interfacial rheometers have been employed in the attempt to resolve this question.