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[11:00-12:00] MST colloquium
- Description:
- MST Colloquium Wednesday, May 23, 2018
Speaker: Prof. Michael Rubinstein
Affiliation: Duke University, Durham, NC, USA
Title: Double-Semidilute Coacervates formed by Oppositely Charged Polyelectrolytes
Location: Computer Science Department, room A115 (ground floor), Voutes
Time: 11.00
Language: English
Abstract
We develop a scaling model for two qualitatively different classes of coacervates formed by oppositely charged polyelectrolytes. The weakly
interacting coacervates are liquids with electrostatic interaction energy per charge less than thermal energy kT.The strongly interacting
coacervates are gels with cross-links formed by ion pairs of opposite charges attracting each other with energy stronger than kT. The liquid
coacervate is a double-semidilute solution with two correlation lengths and two qualitatively different types of conformations of weaker and
stronger charged polyelectrolytes. Weaker charged chains form a screening “coat” around stronger charged chains. The conformations of
weaker charged chains in this screening coat is analogous to a semidilute solution of uncharged polymers. The conformation of stronger
charged polyelectrolytes in liquid coacervates is similar to their conformation in semidilute polyelectrolyte solutions. The strongly
interacting coacervates form bottlebrush gels for longer polyelectrolytes with higher charge density and star-like gels for shorter higher charge density chains.
Host: Dimitris Vlassopoulos 1469
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May 2018
