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Field-Unmasked Surface Charge Enables Programmable Nanofluidics.

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Researchers found that electric fields can dynamically control surface charge in nanofluidic devices. This discovery enables real-time modulation of ionic transport, advancing programmable nanofluidics.

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Area of Science:

  • Nanofluidics
  • Surface Chemistry
  • Electrokinetics

Background:

  • Dynamic control of surface charge density is crucial for programmable nanofluidic devices.
  • Current electrokinetics theory assumes surface charge is invariant under axial electric fields.

Purpose of the Study:

  • To investigate a mechanism for dynamic surface charge modulation in nanofluidic systems using axial electric fields.
  • To demonstrate real-time control over ionic conductance in nanofluidics.

Main Methods:

  • Developed a modified Smoluchowski-Langevin framework to model ion-site equilibria.
  • Conducted experiments on silicon nitride nanopores to measure ionic conductance.
  • Utilized all-atom non-equilibrium molecular dynamics simulations to analyze interfacial phenomena.

Main Results:

  • Discovered that axial electric fields can detrap counterions, exposing additional surface charges.
  • Observed significant, real-time modulations in electroosmotic conductance exceeding classical predictions.
  • Confirmed field-dependent modulation of ionic conductance in experimental nanopores.

Conclusions:

  • Surface charge is not static but can be actively reshaped by electric fields in nanofluidic systems.
  • Field-driven ion dynamics provide a new strategy for programmable control of ionic transport.
  • Findings challenge existing electrokinetic paradigms and open avenues for advanced nanofluidic applications.