Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Molecular Mass Dependence of Interfacial Tension in Complex Coacervation



Debra Audus, Samim Ali, Artem Rumyantsev, Yuanchi Ma, Juan J. de Pablo, Vivek Prabhu


The interfacial tension of coacervates, the liquidlike phase composed of oppositely charged polymers that coexists at equilibrium with a supernatant, forms the basis for multiple technologies. Here we present a comprehensive set of experiments and molecular dynamics simulations to probe the effect of molecular mass on interfacial tension $\gamma$, far from the critical point, and derive $\gamma = \gamma_\infty (1-h/N)$, where $N$ is the degree of polymerization, $\gamma_\infty$ is the infinite molecular mass limit, and $h$ is a constant that physically corresponds to the number of monomers of one chain within the coacervate correlation volume.
Physical Review Letters


Audus, D. , Ali, S. , Rumyantsev, A. , Ma, Y. , de Pablo, J. and Prabhu, V. (2021), Molecular Mass Dependence of Interfacial Tension in Complex Coacervation, Physical Review Letters, [online],, (Accessed May 30, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created June 11, 2021, Updated October 14, 2021