Weak violation of universality for Polyelectrolyte Chains: Variational Theory and Simulations
| dc.creator | Migliorini, G. | |
| dc.creator | Rostiashvili, V. G. | |
| dc.creator | Vilgis, T. A. | |
| dc.date | 2001-02-07 | |
| dc.date.accessioned | 2026-07-07T07:59:34Z | |
| dc.date.available | 2026-07-07T07:59:34Z | |
| dc.description | A variational approach is considered to calculate the free energy and the conformational properties of a polyelectrolyte chain in $d$ dimensions. We consider in detail the case of pure Coulombic interactions between the monomers, when screening is not present, in order to compute the end-to-end distance and the asymptotic properties of the chain as a function of the polymer chain length $N$. We find $R \simeq N^ν(\log N)^γ$ where $ν= \frac{3}{λ+2}$ and $λ$ is the exponent which characterize the long-range interaction $U \propto 1/r^λ$. The exponent $γ$ is shown to be non-universal, depending on the strength of the Coulomb interaction. We check our findings, by a direct numerical minimization of the variational energy for chains of increasing size $2^4<N<2^{15}$. The electrostatic blob picture, expected for small enough values of the interaction strength, is quantitatively described by the variational approach. We perform a Monte Carlo simulation for chains of length $2^4<N<2^{10}$. The non universal behavior of the exponent $ γ$ previously derived within the variational method, is also confirmed by the simulation results. Non-universal behavior is found for a polyelectrolyte chain in $d=3$ dimension. Particular attention is devoted to the homopolymer chain problem, when short range contact interactions are present. | |
| dc.description | to appear in European Phys. Journal E (soft matter) | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0102121 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0102121 | |
| dc.identifier | Eur. Phys. J. E 4, 475-487 (2001) | |
| dc.identifier | doi:10.1007/s101890170103 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/128415 | |
| dc.subject | Soft Condensed Matter | |
| dc.subject | Statistical Mechanics | |
| dc.title | Weak violation of universality for Polyelectrolyte Chains: Variational Theory and Simulations | |
| dc.type | text |