| Issue |
EPL
Volume 124, Number 1, October 2018
|
|
|---|---|---|
| Article Number | 14004 | |
| Number of page(s) | 7 | |
| Section | Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics | |
| DOI | https://doi.org/10.1209/0295-5075/124/14004 | |
| Published online | 09 November 2018 | |
Universality of steric effects of electrolytes in nanoconfinements
1 Jindal Global Business School, O.P. Jindal Global University (JGU) - Sonipat, Haryana-131001, India
2 Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH) - Pohang 37673, Republic of Korea
3 Center for Soft and Living Matter, Institute for Basic Science (IBS) - Ulsan 44919, Republic of Korea
Received: 7 August 2018
Accepted: 8 October 2018
We analyze the steric effect of electrolyte on the normal stress exerted on a wall and the free charge density in a nanoconfinement using the modified Poisson-Boltzmann (mPB) equation. The outward normal stress exerted on the channel wall (Pnn) is calculated by solving the mPB numerically with a constant surface potential for various equilateral polygonal channels and compared with one-dimensional and circular channels by varying the steric factor (γ) and asymmetry of ions (ξ). The results show that the averaged normal stress on the walls (
) and the averaged charge density in the channels (
) are almost independent of the channel shape, and are the same with those of the circular channel. From the numerical observation, we infer the universality of average electric field (
) and average electrical stress (
) on the channel wall, both of which are independent of the channel shape if the hydraulic radius is the same.
PACS: 47.57.jd – Electrokinetic effects / 61.20.Qg – Structure of associated liquids: electrolytes, molten salts, etc. / 41.20.Cv – Electrostatics; Poisson and Laplace equations, boundary-value problems
© EPLA, 2018
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