Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session B15: Polyelectrolyte Complexation
11:30 AM–2:30 PM,
Monday, March 6, 2023
Room: Room 207
Sponsoring
Unit:
DPOLY
Chair: Scott Danielsen, Duke University
Abstract: B15.00007 : Polyelectrolyte and anti-polyelectrolyte effects on chain conformations of polyzwitterions
12:42 PM–12:54 PM
Presenter:
Rajeev Kumar
(Oak Ridge National Lab)
Authors:
Rajeev Kumar
(Oak Ridge National Lab)
Zening Liu
(1Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831)
Yangyang Wang
(Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831)
Jong K Keum
(1Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831 2Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831)
Kunlun Hong
(Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831)
Bobby G Sumpter
(Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831)
are expected to attain either globular (i.e., molten, compact) or random coil conforma-
tions. Addition of salt is expected to open these conformations either due to screen-
ing of dipole-dipole interactions or because of ion-binding to zwitterion groups. Such an effect of salt on chain conformations is called an anti-polyelectrolyte effect. In this talk, I will present our work related to characterizing the anti-polyelectrolyte effect for a polysulfobetaine using dynamic light scattering, small-angle X-ray scattering, ab initio molecular dynamics, and a uniform expansion model. Also, we have discovered a salt concentration range over which the polyelectrolyte effect is observed leading to a shrinkage of polyzwitterionic chains. Implications of these findings on preparing coacervates based on polyzwitterions will be discussed.
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