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Title: Electroosmotic Flow Rectification in Membranes with Asymmetrically Shaped Pores: Effects of Current and Pore Density

Abstract

We have recently demonstrated a new electrokinetic phenomenon—electroosmotic flow rectification in membranes with asymmetrically shaped pores. Flow rectification means that at constant driving force the flow rate in one direction through the membrane is faster than the flow rate in the opposite direction. EOF rectification could be of practical use in microfluidic devices incorporating porous membranes, but additional research is required. As such, we explore here the effects of two key experimental variables—current density used to drive flow through the membrane and membrane pore density—on EOF rectification. We have found that the extent of EOF rectification, as quantified by the rectification ratio, increases with increasing current density. In contrast, the rectification ratio decreases with increasing membrane pore density. We propose explanations for these results based on simple EOF and membrane-transport theories.

Authors:
 [1];  [1];  [1];  [1];  [1]
  1. Univ. of Florida, Gainesville, FL (United States). Dept. of Chemistry
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Nanostructures for Electrical Energy Storage (NEES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1385988
Grant/Contract Number:  
SC0001160
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 119; Journal Issue: 29; Related Information: NEES partners with University of Maryland (lead); University of California, Irvine; University of Florida; Los Alamos National Laboratory; Sandia National Laboratories; Yale University; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Electrical properties; Electrodes; Membranes; Electroosmosis; Electrolytes; Bio-inspired; Energy storage (including batteries and capacitors); Defects; Charge transport; Synthesis (novel materials); Synthesis (self-assembly); Synthesis (scalable processing)

Citation Formats

Bishop, Gregory W., Lopez, Marcos M., Ramiah Rajasekaran, Pradeep, Wu, Xiaojian, and Martin, Charles R. Electroosmotic Flow Rectification in Membranes with Asymmetrically Shaped Pores: Effects of Current and Pore Density. United States: N. p., 2015. Web. doi:10.1021/acs.jpcc.5b03510.
Bishop, Gregory W., Lopez, Marcos M., Ramiah Rajasekaran, Pradeep, Wu, Xiaojian, & Martin, Charles R. Electroosmotic Flow Rectification in Membranes with Asymmetrically Shaped Pores: Effects of Current and Pore Density. United States. https://doi.org/10.1021/acs.jpcc.5b03510
Bishop, Gregory W., Lopez, Marcos M., Ramiah Rajasekaran, Pradeep, Wu, Xiaojian, and Martin, Charles R. Tue . "Electroosmotic Flow Rectification in Membranes with Asymmetrically Shaped Pores: Effects of Current and Pore Density". United States. https://doi.org/10.1021/acs.jpcc.5b03510. https://www.osti.gov/servlets/purl/1385988.
@article{osti_1385988,
title = {Electroosmotic Flow Rectification in Membranes with Asymmetrically Shaped Pores: Effects of Current and Pore Density},
author = {Bishop, Gregory W. and Lopez, Marcos M. and Ramiah Rajasekaran, Pradeep and Wu, Xiaojian and Martin, Charles R.},
abstractNote = {We have recently demonstrated a new electrokinetic phenomenon—electroosmotic flow rectification in membranes with asymmetrically shaped pores. Flow rectification means that at constant driving force the flow rate in one direction through the membrane is faster than the flow rate in the opposite direction. EOF rectification could be of practical use in microfluidic devices incorporating porous membranes, but additional research is required. As such, we explore here the effects of two key experimental variables—current density used to drive flow through the membrane and membrane pore density—on EOF rectification. We have found that the extent of EOF rectification, as quantified by the rectification ratio, increases with increasing current density. In contrast, the rectification ratio decreases with increasing membrane pore density. We propose explanations for these results based on simple EOF and membrane-transport theories.},
doi = {10.1021/acs.jpcc.5b03510},
url = {https://www.osti.gov/biblio/1385988}, journal = {Journal of Physical Chemistry. C},
issn = {1932-7447},
number = 29,
volume = 119,
place = {United States},
year = {2015},
month = {6}
}

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Cited by: 15 works
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