Ionic current in nanochannels grafted with pH-responsive polyelectrolyte brushes modeled using augmented strong stretching theory

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

doi:10.1002/elps.201900248

Title: Ionic current in nanochannels grafted with pH-responsive polyelectrolyte brushes modeled using augmented strong stretching theory

Journal Article · 21 September 2019 · Electrophoresis

DOI: https://doi.org/10.1002/elps.201900248 · OSTI ID:1595335

Sachar, Harnoor Singh ^[1]; Sivasankar, Vishal Sankar ^[2]; Etha, Sai Ankit ^[2]; Chen, Guang ^[3];

^[2]

Univ. of Maryland, College Park, MD (United States); University of Maryland
Univ. of Maryland, College Park, MD (United States)
Princeton Univ., NJ (United States)

Here, we provide a theory to quantify the ionic current (i_ion) in nanochannels grafted with pH-responsive polyelectrolyte (PE) brushes. We consider the PE brushes to be modelled by our recently proposed augmented strong stretching theory (SST) model that improves the existing SST models by incorporating the effects of excluded volume interactions and an extended mass action law. Use of such augmented SST for this problem implies that this is the first study on computing i_ion in PE-brush-grafted nanochannels accounting for the appropriate coupled con guration-electrostatic description of the PE brushes. i_ion is obtained as functions of PE brush grafting density, medium pH and salt concentration (c_∞), and the density of polyelectrolyte chargeable sites (PECS). For large c_∞, i_ion increases linearly with c_∞ (as for such c_∞, i_ion becomes independent of the PE charge and is dominated by the bulk mobility and number density of the electrolyte ions), while iion is independent of c_∞ at small c_∞ (where the EDL electrostatics and the total number of ions in the system is dominated by the hydrogen ions). We further witness an enhancement of i_ion for smaller pH and larger grafting density at low and moderate c_∞, while there is little to no effect of the PECS density on the ionic current except for weakly grafted brushes at low c_∞. We believe that this study will serve as a theoretical foundation for a large number of applications that are based on the brush-induced modification of the ionic current in a nanochannel.

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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) (SC-22)

Grant/Contract Number:: SC0017741

OSTI ID:: 1595335

Journal Information:: Electrophoresis, Journal Name: Electrophoresis Journal Issue: 7-8 Vol. 41; ISSN 0173-0835

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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