For decades, debate has surrounded the electrostatic persistence length (EPL) controlling local polyelectrolyte stiffening, centered on two competing power laws: the linear BJ prediction, $\textbf{l}_\mathrm{e} \sim r_\mathrm{D}$, and the quadratic OSF/KK scaling, $\textbf{l}_\mathrm{e} \sim r_\mathrm{D}^{2}$, where $r...
Alexey A. Gavrilov, A. Johner, Artem M. Rumyantsev· 0 citations
The problem of single-chain conformations of polyelectrolytes in salt-added dilute solutions, and the associated concept of the electrostatic persistence length $\textbf{l}_\mathrm{e}$, has remained unresolved for decades. To address this challenge, we develop a comprehensive scaling theory and corroborate it with simu...
Artem M. Rumyantsev, Alexey A. Gavrilov, A. Johner· 1 citation
Thermoplastic elastomer gels constitute a valuable class of composition-tunable materials that are typically fabricated from styrenic ABA triblock copolymers (i) possessing a morphology with A-dispersions in a B-matrix and (ii) physically modified with a B-selective, low-volatility oil to controllably alter mechanica...
Kacie M. Wells, Alexey A. Gavrilov, Ivan Kuzmenko et al.· Macromolecules· 0 citations
Macromolecular coil-to-helix transitions simultaneously modify local geometry and persistence length, driving complex changes in overall chain size. Here, we apply the wormlike (persistent) chain model to both coil and helical fragments to examine how the degree of helicity, θ, and average helical fragment length, kh,...
Karthik C Sinha, Alexey A. Gavrilov, Artem M. Rumyantsev· Journal of Chemical Physics· 1 citation
This work presents a minimal coarse-grained molecular dynamics model for the coil-helix transition in polymers. We demonstrate that the addition of a Morse potential to a freely jointed chain with volume and bond potentials is sufficient to reproduce the essential thermodynamic features of the transition. From the simu...
Karthik C Sinha, Alexey A. Gavrilov, Artem M. Rumyantsev· Journal of Chemical Physics· 1 citation
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