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Highly rectifying conical nanopores in amorphous SiO2 membranes for nanofluidic osmotic power generation and electroosmotic pumps

Kiy, Alexander ; Dutt, Shankar ; Notthoff, Christian ; Toimil-Molares, Maria E. ; Kirby, Nigel ; Kluth, Patrick (2023)
Highly rectifying conical nanopores in amorphous SiO2 membranes for nanofluidic osmotic power generation and electroosmotic pumps.
In: ACS Applied Nano Materials, 6 (10)
doi: 10.1021/acsanm.3c00960
Article, Bibliographie

Abstract

Nanopore membranes are a versatile platform for a wide range of applications ranging from medical sensing to filtration and clean energy generation. To attain high-flux rectifying ionic flow, it is required to produce short channels exhibiting asymmetric surface charge distributions. This work reports on a system of track etched conical nanopores in amorphous SiO2 membranes, fabricated using the scalable track etch technique. Pores are fabricated by irradiation of 920 +/- 5 nm thick SiO2 windows with 2.2 GeV 197Au ions and subsequent chemical etching. Structural characterization is performed using atomic force microscopy, scanning electron microscopy, small-angle X-ray scattering, ellipsometry, and surface profiling. Conducto-metric characterization of the pore surface is performed using a membrane containing 16 pores, including an in-depth analysis of ionic transport characteristics. The pores have a tip radius of 5.7 +/- 0.1 nm, a half-cone angle of 12.6 +/- 0.1 degrees, and a length of 710 +/- 5 nm. The pKa, pKb, and pI are determined to 7.6 +/- 0.1, 1.5 +/- 0.2, and 4.5 +/- 0.1, respectively, enabling the fine-tuning of the surface charge density between +100 and -300 mC m-2 and allowing to achieve an ionic current rectification ratio of up to 10. This highly versatile technology addresses some of the challenges that contemporary nanopore systems face and offers a platform to improve the performance of existing applications, including nanofluidic osmotic power generation and electroosmotic pumps.

Item Type: Article
Erschienen: 2023
Creators: Kiy, Alexander ; Dutt, Shankar ; Notthoff, Christian ; Toimil-Molares, Maria E. ; Kirby, Nigel ; Kluth, Patrick
Type of entry: Bibliographie
Title: Highly rectifying conical nanopores in amorphous SiO2 membranes for nanofluidic osmotic power generation and electroosmotic pumps
Language: English
Date: 2023
Publisher: ACS Publications
Journal or Publication Title: ACS Applied Nano Materials
Volume of the journal: 6
Issue Number: 10
DOI: 10.1021/acsanm.3c00960
Abstract:

Nanopore membranes are a versatile platform for a wide range of applications ranging from medical sensing to filtration and clean energy generation. To attain high-flux rectifying ionic flow, it is required to produce short channels exhibiting asymmetric surface charge distributions. This work reports on a system of track etched conical nanopores in amorphous SiO2 membranes, fabricated using the scalable track etch technique. Pores are fabricated by irradiation of 920 +/- 5 nm thick SiO2 windows with 2.2 GeV 197Au ions and subsequent chemical etching. Structural characterization is performed using atomic force microscopy, scanning electron microscopy, small-angle X-ray scattering, ellipsometry, and surface profiling. Conducto-metric characterization of the pore surface is performed using a membrane containing 16 pores, including an in-depth analysis of ionic transport characteristics. The pores have a tip radius of 5.7 +/- 0.1 nm, a half-cone angle of 12.6 +/- 0.1 degrees, and a length of 710 +/- 5 nm. The pKa, pKb, and pI are determined to 7.6 +/- 0.1, 1.5 +/- 0.2, and 4.5 +/- 0.1, respectively, enabling the fine-tuning of the surface charge density between +100 and -300 mC m-2 and allowing to achieve an ionic current rectification ratio of up to 10. This highly versatile technology addresses some of the challenges that contemporary nanopore systems face and offers a platform to improve the performance of existing applications, including nanofluidic osmotic power generation and electroosmotic pumps.

Uncontrolled Keywords: ion transport, SiO2 nanopore membrane, swift heavy ion irradiation, nanofluidic osmotic power generation, electroosmotic pump, conductometry, track etched nanopore
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Ion-Beam-Modified Materials
Date Deposited: 26 Feb 2024 06:45
Last Modified: 26 Feb 2024 10:24
PPN: 515809098
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