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Related Experiment Videos

Gateable nanofluidic interconnects for multilayered microfluidic separation systems.

Tzu-Chi Kuo1, Donald M Cannon, Yanning Chen

  • 1Department of Chemistry, and Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, USA.

Analytical Chemistry
|April 26, 2003
PubMed
Summary

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Novel nanocapillary interconnects enable controllable three-dimensional fluidic device construction. This technology allows precise analyte transfer between microchannels for advanced separations and manipulations.

Area of Science:

  • Microfluidics
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Microfluidic devices enable complex fluidic and chemical manipulations.
  • Integrating multiple fluidic layers in 3D microfluidic systems requires innovative interfacing methods.

Purpose of the Study:

  • To describe externally controllable interconnects for hybrid 3D microfluidic architectures.
  • To demonstrate controllable nanofluidic analyte transfer between microchannels.

Main Methods:

  • Utilizing nuclear track-etched polycarbonate membranes with nanometer-diameter capillaries as interconnects.
  • Controlling nanofluidic transfer via applied bias, polarity, nanopore surface charge, and nanocapillary impedance.
  • Implementing nanochannel array gating for capillary electrophoresis separations.

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Main Results:

  • Achieved hybrid 3D fluidic architectures with controllable interconnects.
  • Demonstrated three stable analyte transfer levels (zero, reverse, forward bias) between microchannels.
  • Showcased analyte transfer dependency on molecular size, indicating flexible control.
  • Successfully applied nanochannel array gating for isolating separated components in capillary electrophoresis.

Conclusions:

  • Externally controllable nanocapillary interconnects facilitate the creation of complex 3D microfluidic devices.
  • Precise control over nanofluidic analyte transport is achievable by manipulating electrical and surface properties.
  • This technology enables advanced analytical techniques, including preparative separations at attomole levels.