Aggregation dynamics of rigid polyelectrolytes

The Journal of Chemical Physics
Anvy Moly TomSatyavani Vemparala

Abstract

Similarly charged polyelectrolytes are known to attract each other and aggregate into bundles when the charge density of the polymers exceeds a critical value that depends on the valency of the counterions. The dynamics of aggregation of such rigid polyelectrolytes are studied using large scale molecular dynamics simulations. We find that the morphology of the aggregates depends on the value of the charge density of the polymers. For values close to the critical value, the shape of the aggregates is cylindrical with height equal to the length of a single polyelectrolyte chain. However, for larger values of charge, the linear extent of the aggregates increases as more and more polymers aggregate. In both the cases, we show that the number of aggregates decrease with time as power laws with exponents that are not numerically distinguishable from each other and are independent of charge density of the polymers, valency of the counterions, density, and length of the polyelectrolyte chain. We model the aggregation dynamics using the Smoluchowski coagulation equation with kernels determined from the molecular dynamics simulations and justify the numerically obtained value of the exponent. Our results suggest that once counterions con...Continue Reading

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Citations

Sep 7, 2016·The Journal of Physical Chemistry Letters·Afroditi Maria ZakiPaola Carbone
Oct 17, 2017·The Journal of Chemical Physics·Anvy Moly TomSatyavani Vemparala
Mar 20, 2018·Physical Review. E·Colm ConnaughtonOleg Zaboronski
Oct 16, 2016·Physical Review Letters·Anvy Moly TomNikolai V Brilliantov
Aug 24, 2019·The Journal of Chemical Physics·Susmita GhoshSatyavani Vemparala
Jul 31, 2021·ACS Nano·Arnab MukherjeeYves Lansac
Nov 18, 2021·Physical Chemistry Chemical Physics : PCCP·Yulia D GordievskayaAlexey A Gavrilov

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