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Title: Electrodiffusioosmosis-Induced Negative Differential Resistance in pH-Regulated Mesopores Containing Purely Monovalent Solutions

Abstract

Negative differential resistance (NDR) refers to a unique electrical property where current decreases with increasing voltage. Herein, we report experimental evidence showing that the NDR effect can be observed in mesopores that feature charged pore walls and are subjected to a KCl concentration gradient. NDR in our system originates from the solution and ion flows driven by the synergistic effects of electroosmosis [electroosmotic flow (EOF)] and diffusioosmosis, the so-called electrodiffusioosmosis. Experiments reveal that in addition to the ion current rectification, the mesopores considered here exhibit the NDR phenomenon that is dependent on the magnitude and direction of the salinity gradient and on pH. The NDR behavior can be observed only at conditions at which the EOF and diffusioosmosis occur in the opposite directions: diffusioosmosis fills the tip opening with a high concentration solution, while EOF brings a low concentration solution to the pore. All experimental findings are supported by our numerical model, which takes into account the interfacial site reactions of acidic and basic functional groups on the entire pore membrane surfaces. Our results provide an important insight into how liquid pH, salinity gradients, interfacial site reactions, and pore geometries can influence the current-voltage characteristics of mesopores, enriching transport modesmore » that can be induced by voltage.« less

Authors:
ORCiD logo [1];  [2];  [3]; ORCiD logo; ORCiD logo [2]
  1. Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan; Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
  2. Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
  3. Bright Shetland International Company, Ltd., New Taipei City 22101, Taiwan
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Ministry of Science and Technology (MOST)
OSTI Identifier:
1580673
Alternate Identifier(s):
OSTI ID: 1591751
Grant/Contract Number:  
SC0019112
Resource Type:
Published Article
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Name: ACS Applied Materials and Interfaces Journal Volume: 12 Journal Issue: 2; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; nanofluidics; ion transport; ionic circuit; ion current rectification; negative differential resistance

Citation Formats

Lin, Chih-Yuan, Wong, Pei-Hsuan, Wang, Pei-Hsin, Siwy, Zuzanna S., and Yeh, Li-Hsien. Electrodiffusioosmosis-Induced Negative Differential Resistance in pH-Regulated Mesopores Containing Purely Monovalent Solutions. United States: N. p., 2019. Web. doi:10.1021/acsami.9b18524.
Lin, Chih-Yuan, Wong, Pei-Hsuan, Wang, Pei-Hsin, Siwy, Zuzanna S., & Yeh, Li-Hsien. Electrodiffusioosmosis-Induced Negative Differential Resistance in pH-Regulated Mesopores Containing Purely Monovalent Solutions. United States. doi:10.1021/acsami.9b18524.
Lin, Chih-Yuan, Wong, Pei-Hsuan, Wang, Pei-Hsin, Siwy, Zuzanna S., and Yeh, Li-Hsien. Tue . "Electrodiffusioosmosis-Induced Negative Differential Resistance in pH-Regulated Mesopores Containing Purely Monovalent Solutions". United States. doi:10.1021/acsami.9b18524.
@article{osti_1580673,
title = {Electrodiffusioosmosis-Induced Negative Differential Resistance in pH-Regulated Mesopores Containing Purely Monovalent Solutions},
author = {Lin, Chih-Yuan and Wong, Pei-Hsuan and Wang, Pei-Hsin and Siwy, Zuzanna S. and Yeh, Li-Hsien},
abstractNote = {Negative differential resistance (NDR) refers to a unique electrical property where current decreases with increasing voltage. Herein, we report experimental evidence showing that the NDR effect can be observed in mesopores that feature charged pore walls and are subjected to a KCl concentration gradient. NDR in our system originates from the solution and ion flows driven by the synergistic effects of electroosmosis [electroosmotic flow (EOF)] and diffusioosmosis, the so-called electrodiffusioosmosis. Experiments reveal that in addition to the ion current rectification, the mesopores considered here exhibit the NDR phenomenon that is dependent on the magnitude and direction of the salinity gradient and on pH. The NDR behavior can be observed only at conditions at which the EOF and diffusioosmosis occur in the opposite directions: diffusioosmosis fills the tip opening with a high concentration solution, while EOF brings a low concentration solution to the pore. All experimental findings are supported by our numerical model, which takes into account the interfacial site reactions of acidic and basic functional groups on the entire pore membrane surfaces. Our results provide an important insight into how liquid pH, salinity gradients, interfacial site reactions, and pore geometries can influence the current-voltage characteristics of mesopores, enriching transport modes that can be induced by voltage.},
doi = {10.1021/acsami.9b18524},
journal = {ACS Applied Materials and Interfaces},
number = 2,
volume = 12,
place = {United States},
year = {2019},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1021/acsami.9b18524

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Cited by: 2 works
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