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Updated: May 18, 2026

Fine-tuning the Size and Minimizing the Noise of Solid-state Nanopores

Fine-tuning the Size and Minimizing the Noise of Solid-state Nanopores

Published on: October 31, 2013

Pressure-driven flow through a single nanopore.

A E Velasco¹, S G Friedman, M Pevarnik

¹Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|September 26, 2012

Summary

This summary is machine-generated.

Gas flow through polymer film pores was measured. At high Knudsen numbers, flow scales with pressure and pore radius cubed, consistent with diffusive scattering. At low Knudsen numbers, flow approaches the conventional Poiseuille value.

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Area of Science:

Materials Science
Physical Chemistry
Nanotechnology

Background:

Understanding gas transport through nanopores is crucial for membrane technology and nanofluidics.
Ion track pores offer well-defined geometries for fundamental transport studies.

Purpose of the Study:

To investigate gas flow behavior in single ion track pores.
To characterize gas transport regimes from Knudsen to hydrodynamic flow.
To compare experimental results with kinetic theory models.

Main Methods:

Gas flow measurements using mass spectrometry.
Fabrication of polymer films with precisely defined ion track pores (12 μm length, 50-1000 nm diameter).
Application of pressure drops ranging from 0 to 30 atm.

Main Results:

At high Knudsen numbers (Kn >> 1), flow rate is proportional to pressure drop and pore radius cubed, indicating diffusive scattering.
At low Knudsen numbers (Kn ≤ 0.1), hydrodynamic conductance increases.
Flow behavior converges to the Poiseuille flow regime with negligible slip length at the pore walls.

Conclusions:

The study elucidates gas transport mechanisms in nanopores across different Knudsen number regimes.
Experimental findings align with predictions from kinetic theory and continuum fluid dynamics.
Results provide insights into gas flow behavior relevant for nanoscale device design and membrane applications.