Theoretical study on the massively augmented electro-osmotic water transport in polyelectrolyte brush functionalized nanoslits

Sivasankar, Vishal Sankar; Etha, Sai Ankit; Sachar, Harnoor Singh; Das, Siddhartha

doi:10.1103/PhysRevE.102.013103

Title: Theoretical study on the massively augmented electro-osmotic water transport in polyelectrolyte brush functionalized nanoslits

Journal Article · Wed Jul 08 00:00:00 EDT 2020 · Physical Review E

DOI:https://doi.org/10.1103/PhysRevE.102.013103· OSTI ID:1638137

Sivasankar, Vishal Sankar ^[1]; Etha, Sai Ankit ^[1]; Sachar, Harnoor Singh ^[1];

^[1]

Univ. of Maryland, College Park, MD (United States)

In this paper, we demonstrate that functionalizing nanoslits with pH-responsive polyelectrolyte (PE) brushes can lead to extremely fast electroosmotic (EOS) water transport, where the maximum centreline velocity and the volume ow rate can be an order of magnitude larger than these quantities in identically charged brush-free nanochannels for a wide range of system parameters. Such an enhancement is most remarkable given that the brushes have been known to retard the transport by imparting additional drag on the fluid flow. We argue that this enhancement stems from the localization of the charge density of the brush-induced electric double layer (and hence the EOS body force) away from the nanochannel wall (or the location of the wall-induced drag force). This ensures a much larger impact of the EOS body force triggering such fast water transport. Lastly, the calculated flux values for the present brush-grafted nanochannels are found to be signi ficantly larger than those for a wide range of nanofluidic membranes and channels, suggesting that the brush functionalization can be considered as a mechanism for enabling such superfast nanofluidic transport.

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Research Organization:: Univ. of Maryland, College Park, MD (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0017741

OSTI ID:: 1638137

Journal Information:: Physical Review E, Vol. 102, Issue 1; ISSN 2470-0045

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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