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Title: Thermoosmotic Transport in Nanochannels Grafted with pH-responsive Polyelectrolyte Brushes Modelled Using Augmented Strong Stretching Theory

Abstract

In this paper, we develop a theory to establish that the thermoosmotic (TOS) effects, induced by the application of an axial temperature gradient, leads to a massive enhancement in liquid transport in nanochannels grafted with charged polyelectrolyte (PE) brushes. Here, we quantify the TOS transport by quantifying the induced electric field and the induced TOS flow field. The different components of the electric field, namely the ionic component, the thermal component, and the osmotic component, as well as the contributions of different ions to these components, are quantified. Furthermore, we express the TOS velocity as a combination of chemiosmotic (COS), thermal, and electroosmotic (EOS) components. The COS and the thermal components augment each other and the overall strength and direction of the TOS flow are dictated by the direction and the relative strength of the EOS component. Most importantly, we compare the cases of brush-grafted nanochannels with those of the brush-free nanochannels of identical surface charge densities: the TOS transport is massively augmented in the brush-grafted nanochannels attributed to the combination of the localization of the EDL (and hence any body force that depends on the EDL charge density) away from the nanochannel wall (i.e., the location of the maximummore » drag force) and the presence of a possible molecular slip (experienced by the liquid) along the brush surface.« less

Authors:
 [1];  [1];  [1]; ORCiD logo [1]
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  1. Univ. of Maryland, College Park, MD (United States)
Publication Date:
Research Org.:
Univ. of Maryland, College Park, MD (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1773002
Grant/Contract Number:  
SC0017741
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Fluid Mechanics
Additional Journal Information:
Journal Volume: 917; Journal ID: ISSN 0022-1120
Publisher:
Cambridge University Press
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Sivasankar, Vishal Sankar, Etha, Sai Ankit, Sachar, Harnoor Singh, and Das, Siddhartha. Thermoosmotic Transport in Nanochannels Grafted with pH-responsive Polyelectrolyte Brushes Modelled Using Augmented Strong Stretching Theory. United States: N. p., 2021. Web. doi:10.1017/jfm.2021.281.
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Sivasankar, Vishal Sankar, Etha, Sai Ankit, Sachar, Harnoor Singh, & Das, Siddhartha. Thermoosmotic Transport in Nanochannels Grafted with pH-responsive Polyelectrolyte Brushes Modelled Using Augmented Strong Stretching Theory. United States. https://doi.org/10.1017/jfm.2021.281
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Sivasankar, Vishal Sankar, Etha, Sai Ankit, Sachar, Harnoor Singh, and Das, Siddhartha. Wed . "Thermoosmotic Transport in Nanochannels Grafted with pH-responsive Polyelectrolyte Brushes Modelled Using Augmented Strong Stretching Theory". United States. https://doi.org/10.1017/jfm.2021.281. https://www.osti.gov/servlets/purl/1773002.
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@article{osti_1773002,
title = {Thermoosmotic Transport in Nanochannels Grafted with pH-responsive Polyelectrolyte Brushes Modelled Using Augmented Strong Stretching Theory},
author = {Sivasankar, Vishal Sankar and Etha, Sai Ankit and Sachar, Harnoor Singh and Das, Siddhartha},
abstractNote = {In this paper, we develop a theory to establish that the thermoosmotic (TOS) effects, induced by the application of an axial temperature gradient, leads to a massive enhancement in liquid transport in nanochannels grafted with charged polyelectrolyte (PE) brushes. Here, we quantify the TOS transport by quantifying the induced electric field and the induced TOS flow field. The different components of the electric field, namely the ionic component, the thermal component, and the osmotic component, as well as the contributions of different ions to these components, are quantified. Furthermore, we express the TOS velocity as a combination of chemiosmotic (COS), thermal, and electroosmotic (EOS) components. The COS and the thermal components augment each other and the overall strength and direction of the TOS flow are dictated by the direction and the relative strength of the EOS component. Most importantly, we compare the cases of brush-grafted nanochannels with those of the brush-free nanochannels of identical surface charge densities: the TOS transport is massively augmented in the brush-grafted nanochannels attributed to the combination of the localization of the EDL (and hence any body force that depends on the EDL charge density) away from the nanochannel wall (i.e., the location of the maximum drag force) and the presence of a possible molecular slip (experienced by the liquid) along the brush surface.},
doi = {10.1017/jfm.2021.281},
journal = {Journal of Fluid Mechanics},
number = ,
volume = 917,
place = {United States},
year = {Wed Apr 28 00:00:00 EDT 2021},
month = {Wed Apr 28 00:00:00 EDT 2021}
}
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https://doi.org/10.1017/jfm.2021.281
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