Bulletin of the American Physical Society
APS March Meeting 2023
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: B15.00008 : Asymmetry in charge density and size in polymer complexation: partially ionizable polyelectrolytes and intrinsically disordered proteins*
12:54 PM–1:06 PM
Presenter:
Arindam Kundagrami
(Department of Physical Sciences and Centre for Advanced Functional Materials, IISER Kolkata)
Authors:
Arindam Kundagrami
(Department of Physical Sciences and Centre for Advanced Functional Materials, IISER Kolkata)
Soumik Mitra
(Department of Physical Sciences, IISER Kolkata)
Souradeep Ghosh
(Department of Physical Sciences and Centre for Advanced Functional Materials, IISER Kolkata)
Aritra Chowdhury
(Department of Biochemistry, University of Zurich)
Ben Schuler
(Department of Biochemistry, University of Zurich)
The thermodynamics of a charged polymer system is characterized by the interaction potentials, conformational entropy of the polymer chains and entropy of free counterions and salt ions. We present a theory which investigates the role of enthaply and entropy, and calculates the driving force, of complexation between oppositely charged polyelectrolytes which are partially ionizable and, in general, asymmetric in charge density and size. The analysis delineates the enthalpy- and entropy-driven regimes in electrostatic strength, and also calculates the potential of mean force, as functions of charge density. The general concepts such as of counterion release entropy and its effect on complexation drive apply equally well to symmetric, fully ionizable, or asymmetric and partially ionizable polyelectrolytes, and also to intrinsically disordered proteins (IDP).
*Ministry of Education, India
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