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In-Situ Gas Permeation-Driven Ionic Current Rectification of Heterogeneously Charged Nanopore Arrays.
Sangjin Seo1, Taesung Kim1,2
1Department of Mechanical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea.
Small (Weinheim an Der Bergstrasse, Germany)
|June 20, 2024
Summary
Researchers developed particle-assembly-based ionic diodes (PAIDs) for microfluidic devices. Gas flow precisely controls ionic current rectification (ICR), enabling new applications in nanofluidics and sensing.
Area of Science:
- Nanofluidics
- Materials Science
Background:
- Ionic diodes enable ionic current rectification (ICR) crucial for micro-/nanofluidic applications.
- Current limitations in ICR modulation include restricted active and localized control, hindering multiplexing.
Purpose of the Study:
- To present a microfluidic device with particle-assembly-based ionic diodes (PAIDs) for modulated ICR.
- To demonstrate precise control over nanopore physiochemical conditions via in-situ gas permeation for ICR modulation.
Main Methods:
- Integration of PAIDs with an overlying gas-flow channel.
- Utilizing in-situ gas permeation through a polymeric film to alter nanopore conditions.
- Characterization of rectification properties and capacitor-like behavior of PAIDs.
Main Results:
- Demonstrated active modulation of ICR using various gas flows.
- Showcased reversible ICR modulation via gas-dissolved solutions, leading to ion-signal amplification.
- Established programmable manipulation of ion transport in PAIDs through gas permeation.
Conclusions:
- PAIDs offer versatile nanofluidic components with actively modulated ICR.
- In-situ gas-permeation provides programmable control over ion transport.
- Multiplexed, addressable PAIDs on-chip hold potential for ion signaling, logic, reactors, and sensing.
