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Related Experiment Video

Updated: Jun 21, 2026

Flow-assisted Dielectrophoresis: A Low Cost Method for the Fabrication of High Performance Solution-processable Nanowire Devices
09:14

Flow-assisted Dielectrophoresis: A Low Cost Method for the Fabrication of High Performance Solution-processable Nanowire Devices

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Transition flow through an ultra-thin nanosieve.

S Unnikrishnan1, H V Jansen, F H Falke

  • 1Transducers Science and Technology Group, MESA+ Institute for Nanotechnology, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands. s.unnikrishnan@ewi.utwente.nl

Nanotechnology
|July 8, 2009
PubMed
Summary

Researchers developed an ultra-thin inorganic nanosieve exhibiting unique transition gas flow behavior. This novel material demonstrates selective gas separation, paving the way for advanced filtration technologies.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Fluid Dynamics

Background:

  • Understanding gas flow in nanoporous materials is crucial for separation technologies.
  • Transition flow regime, occurring between viscous and molecular flow, presents unique challenges for characterization.
  • Ultra-thin nanosieves offer a promising platform for fundamental studies of gas transport phenomena.

Purpose of the Study:

  • To fabricate and characterize an ultra-thin inorganic nanosieve.
  • To investigate the gas flow behavior within the nanosieve, particularly in the transition regime.
  • To evaluate the gas separation capabilities of the nanosieve.

Main Methods:

  • Fabrication of an ultra-thin inorganic nanosieve using interference lithography and bond-micromachining.
  • Gas flow characterization under atmospheric pressure and ambient temperature.
  • Measurement of flow selectivity between different gases (Helium and Argon).

Main Results:

  • The nanosieve exhibits transition gas flow behavior around atmospheric pressure.
  • The ultra-thin pore structure (45 nm lip thickness, 120 nm diameter) minimizes molecule-wall interactions, enabling pure transition flow analysis.
  • Transition flux was observed as a superposition of viscous and molecular fluxes without higher-order slip correction.
  • A flow selectivity of 3.1 was achieved between Helium and Argon at 20 mbar.

Conclusions:

  • The fabricated ultra-thin nanosieve effectively demonstrates transition gas flow behavior.
  • The unique pore geometry facilitates fundamental understanding of gas transport in the transition regime.
  • The nanosieve shows potential for selective gas separation applications.