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Related Concept Videos

Controlled-Potential Coulometry: Electrolytic Methods01:17

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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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Controlled-Current Coulometry: Overview01:27

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Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
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Pressure-Controlled Nanopipette Sensing in the Asymmetric-Conductivity Configuration.

Sebastian A Skaanvik1,2, Xinyu Zhang3, Ian J McPherson4

  • 1Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus 8000, Denmark.

ACS Nano
|March 31, 2025
PubMed
Summary

This study explores nanopipette sensing using an asymmetric-conductivity configuration. Researchers found that electroosmotic flow, not ion migration, dominates current response, enabling simple control and enhanced sensitivity.

Keywords:
electroosmotic flowion current rectificationnanopipettescanning ion conductance microscopyscanning probe microscopysurface charge mapping

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Area of Science:

  • * Nanotechnology and Nanoscience
  • * Physical Chemistry
  • * Materials Science

Background:

  • * Nanopipettes are essential tools in biology, physics, and materials science, requiring precise characteristic control for optimal performance.
  • * Asymmetric-conductivity configurations with differing electrolyte solutions enhance nanopipette sensing but present complex transport phenomena (diffusion, electromigration, electroosmosis).

Purpose of the Study:

  • * To systematically investigate the fundamental regime of asymmetric-conductivity nanopipettes where electroosmotic flow effects are maximized.
  • * To understand the current-potential and current-distance relationships in this configuration.
  • * To develop methods for optimizing nanopipette sensitivity in asymmetric-conductivity setups.

Main Methods:

  • * Characterization of current-potential and current-distance relationships in nanopipettes.
  • * Systematic exploration of the asymmetric-conductivity configuration, minimizing ion-selective migration effects.
  • * Introduction of external pressure to control fluid flow rates and tune the ionic environment.

Main Results:

  • * The asymmetric-conductivity configuration exhibits characteristics similar to traditional rectifying nanopipettes, including surface charge sensitivity.
  • * Current response is primarily governed by the rate and direction of solution mixing driven by electroosmotic flow.
  • * External pressure provides an effective means to control fluid dynamics and optimize sensitivity *in situ*.

Conclusions:

  • * Electroosmotic flow is the dominant factor in the studied asymmetric-conductivity nanopipette regime.
  • * This configuration offers a simplified yet sensitive approach to nanopipette sensing, comparable to traditional methods.
  • * External pressure-driven flow control presents a viable strategy for *in situ* optimization of nanopipette performance.