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Related Concept Videos

Electrochemical Systems01:24

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
Processes at Electrodes01:30

Processes at Electrodes

The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...
Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current passing...
Electrogravimetric Analysis: Overview01:30

Electrogravimetric Analysis: Overview

Electrogravimetric analysis measures the weight of an analyte deposited electrolytically onto a suitable working electrode. This method involves applying a potential to a pre-weighed electrode submerged in a solution, which results in the desired substance being deposited through reduction at the cathode or oxidation at the anode. The electrode's weight is recorded after deposition, and the difference in weight gives the analyte's weight in the solution.
To test the completeness of the...
The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
Electrochemical Gradient and Channel Proteins: An Overview01:21

Electrochemical Gradient and Channel Proteins: An Overview

An electrochemical gradient is a fundamental concept in biology and chemistry. It regulates the movement of ions across cell membranes. This movement is influenced by two factors:
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell.  This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to the...

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Related Experiment Video

Updated: Jun 20, 2026

Tracking Electrochemistry on Single Nanoparticles with Surface-Enhanced Raman Scattering Spectroscopy and Microscopy
10:59

Tracking Electrochemistry on Single Nanoparticles with Surface-Enhanced Raman Scattering Spectroscopy and Microscopy

Published on: May 12, 2023

Understanding electrokinetics at the nanoscale: A perspective.

Hsueh-Chia Chang1, Gilad Yossifon

  • 1Department of Chemical and Biomolecular Engineering, Center for Microfluidics and Medical Diagnostics, University of Notre Dame, Notre Dame, Indiana 46556, USA.

Biomicrofluidics
|August 21, 2009
PubMed
Summary
This summary is machine-generated.

Electrokinetics is key for portable diagnostics and nanofluidic sensors. However, ion transport and flow in nanoporous membranes need further study for molecular sensing applications.

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Last Updated: Jun 20, 2026

Tracking Electrochemistry on Single Nanoparticles with Surface-Enhanced Raman Scattering Spectroscopy and Microscopy
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Area of Science:

  • Nanotechnology
  • Physical Chemistry
  • Biophysics

Background:

  • Electrokinetics is a promising microfluidic technique for portable diagnostics and nanofluidic molecular detection.
  • Current understanding of ion transport and electro-osmotic flow in nanoporous membranes is inadequate.
  • Nanoporous membranes contain natural nanochannels crucial for these processes.

Purpose of the Study:

  • To review ion-flux and hydrodynamic anomalies in nanoporous membranes.
  • To speculate on potential applications, especially in molecular sensing.
  • To revisit existing disciplines and identify open questions in electrokinetics.

Main Methods:

  • Literature review of electrokinetic phenomena.
  • Analysis of ion transport and hydrodynamic anomalies.
  • Speculative discussion on applications in molecular sensing.

Main Results:

  • Identified several ion-flux and hydrodynamic anomalies in nanoporous membranes.
  • Highlighted the inadequacy of current models for these phenomena.
  • Proposed potential applications of these anomalies in molecular sensing.

Conclusions:

  • Further research into electrokinetics in nanoporous membranes is essential.
  • Understanding these anomalies could lead to advancements in portable diagnostics and molecular detection.
  • This field holds potential for creating new scientific disciplines.