Effective interactions in polydisperse systems of penetrable macroions

Autor(en)

Thiago Colla, Christos N. Likos

Abstrakt

A coarse-graining approach based on the linear response theory is applied to deduce general expressions for the effective pair potentials in a multi-component system of soft macroions. Within the underlying approximations, the effective pair potentials can be written as simple convolutions between the intrinsic macroion charge distributions and a Yukawa-like potential which effectively contains the averaged contributions from the small ions. Two different charge distributions are assigned to the soft macroions: a Gaussian-like diffuse distribution and a uniform charge distribution inside the particle cores. The resulting effective pair potentials are then used in an effective model based on the hyppernetted chain approximation to investigate the structural properties of a two-component system of oppositely charged particles as a function of the various system parameters. It is found that the condensation of counterions is much stronger in the case of particles with a Gaussian charge distribution, leading to much weaker electrostatic interactions and less structured pair correlations in comparison with the system of uniformly charged macroions.

Organisation(en)

Computergestützte Physik und Physik der Weichen Materie

Externe Organisation(en)

Universität Wien

Journal

Molecular Physics: an international journal in the field of chemical physics

Band

113

Seiten

2496-2510

Anzahl der Seiten

15

ISSN

0026-8976

DOI

https://doi.org/10.1080/00268976.2015.1026295

Publikationsdatum

09-2015

Peer-reviewed

Ja

ÖFOS 2012

103036 Theoretische Physik, 103015 Kondensierte Materie, 103029 Statistische Physik

Schlagwörter

ASJC Scopus Sachgebiete

Condensed Matter Physics, Molecular Biology, Biophysics, Physical and Theoretical Chemistry

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/a3c3893e-874d-4174-b8f2-d949cd5f4fb7