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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
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Capillary electrophoresis instrumentation typically consists of several key components. A high-voltage power supply generates the electric field necessary for the separation by connecting to an anode (the positively charged electrode) and a cathode (the negatively charged electrode) located in buffer reservoirs at each end of the capillary tube. The system includes a sample vial, a fused silica capillary tube coated with polyimide for mechanical strength through which the sample components...
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Modulating Electrostatic Interactions to Control the Analyte Transport in Nanochannels.

H Samet Varol1, Matteo Cingolani1, Francesco Casnati1

  • 1Dipartimento di Chimica "Giacomo Ciamician", Università di Bologna, via Selmi 2, Bologna 40126, Italy.

ACS Applied Materials & Interfaces
|October 6, 2025
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Summary
This summary is machine-generated.

This study introduces a fluorescence method to monitor submicromolar diffusion, revealing that electrostatic interactions slow analyte transport in nanochannels at micromolar concentrations. These interactions can be controlled by pH or competitor ions.

Keywords:
fluorescence correlation spectroscopyionic diffusionmembranenanoconfinement

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Area of Science:

  • Biomimetic technologies
  • Nanopore analysis
  • Surface interactions

Background:

  • Ion-receptor binding drives biological responses and biomimetic technologies.
  • Analyte-nanopore interactions influence transport differently across concentration regimes.
  • Previous studies focused on millimolar (favoring transport) or nanomolar (slowing diffusion) concentrations.

Purpose of the Study:

  • To develop a simple fluorescence setup for monitoring submicromolar diffusion.
  • To investigate analyte-nanochannel wall interactions at micromolar concentrations.
  • To demonstrate control over these electrostatic interactions.

Main Methods:

  • A simple and inexpensive fluorescence setup was employed.
  • Submicromolar diffusion was monitored, bridging concentration regimes.
  • Electrostatic interactions were studied using Ru(bpy)3^2+ as the analyte.

Main Results:

  • Electrostatic interactions between Ru(bpy)3^2+ and nanochannel walls slowed transport by ~20% at micromolar concentrations.
  • This slowing is attributed to diffusion mediated by transient surface adsorption.
  • Interactions were successfully modulated by altering pH and introducing Ca2+ ions.

Conclusions:

  • The developed fluorescence method effectively bridges concentration regimes for diffusion studies.
  • Transient surface adsorption significantly impacts analyte transport in nanochannels.
  • Electrostatic interactions offer a tunable mechanism for controlling transport in nanodevices.