Publication Cover
Molecular Physics
An International Journal at the Interface Between Chemistry and Physics
Volume 121, 2023 - Issue 19-20: Thermodynamics 2022 Conference
72
Views
5
CrossRef citations to date
0
Altmetric
Thermodynamics 2022 Special Issue (by invitation only)

Effective electrostatic interaction between columnar colloids: roles of solvent steric hindrance, polarity, and surface geometric characteristics

Article: e2216632 | Received 24 Nov 2022, Accepted 18 May 2023, Published online: 25 May 2023
 

Abstract

In the present work, coupling between the electrostatic interaction and solvent steric hindrance, and solvent polarity are studied by classical density functional theory with emphasis on their influence on the effective electrostatic potential between two similarly charged and parallel cylinder surfaces immersed in electrolyte solution.Several conclusions are confirmed. First, solvent steric hindrance always enhances the effective electrostatic potential curve oscillation and its first potential well depth or induces the potential well formation even in +1:−1 electrolyte; the enhancing effects are positively correlated with the solvent packing fraction. The curve oscillation is weakened anomalously with the surface charge density strength. Second, with a certain packing fraction of the crowding agent, its diameter has no distinct effect on the oscillation intensity of the effective electrostatic potential curves, but the oscillation period is always equal to the diameter. Third, influences of solvophilicity or solvophobicity of counter- and co-ions on the effective electrostatic potential are different in strength and mode. Strong counter-ion solvophobicity greatly raises the like-charge attraction strength with a simultaneously weakening of the effective electrostatic potential oscillation, and vice versa; solvophobicity or solvophilicity of co-ion influences the effective electrostatic potential curve in a less obvious way by translating it up/down, respectively; more specifically, the curve morphology is rarely changed. Fourth, it is illustrated that high counter-ion valence and high surface charge are not necessary conditions (confirmed in previous literature) of the surface charge reversal occurrence; counter-ion solvophobicity induces the charge reversal at far milder conditions: univalent counter-ion, lower bulk concentration, and lower surface charge strength. Fifth, by comparing with previous two works on the effects of solvent granularity on the effective electrostatic potential in flat and spherical slits, we conclude that the flat slit contact potential is always repulsive, the spherical slit contact potential can be very attractive, and the present cylinder slit contact potential is between the two.

GRAPHICAL ABSTRACT

This article is part of the following collections:
Thermodynamics 2022 Conference

Acknowledgements

The author would like to thank genuinely the anonymous reviewers for valuable comments which help in improving the work.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

Additional information

Funding

This project is supported by the National Natural Science Foundation of China [grant number 22173117]. This work is supported in part by the High Performance Computing Centre of Central South University.

Reprints and Corporate Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

To request a reprint or corporate permissions for this article, please click on the relevant link below:

Academic Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

Obtain permissions instantly via Rightslink by clicking on the button below:

If you are unable to obtain permissions via Rightslink, please complete and submit this Permissions form. For more information, please visit our Permissions help page.