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Related Concept Videos

Theory of Strong Electrolytes01:23

Theory of Strong Electrolytes

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The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
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Interfacial Electrochemical Methods: Overview01:06

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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...
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Electrochemical Systems01:24

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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,...
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Processes at Electrodes01:30

Processes at Electrodes

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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...
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Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
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Electrophoresis: Overview01:20

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Electrophoresis is a powerful analytical separation technique that relies on the differential migration of charged species when subjected to an electric field. The core strength of electrophoresis lies in its ability to separate high-molecular-weight species in complex mixtures. It has found widespread use in biochemistry, molecular biology, and analytical chemistry, allowing the separation of compounds like amino acids, nucleotides, carbohydrates, and proteins with excellent resolution.
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Related Experiment Video

Updated: Mar 26, 2026

Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
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Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions

Published on: September 7, 2018

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Ultrafast electrokinetics.

Mehrnaz Rouhi Youssefi1, Francisco Javier Diez1

  • 1Department of Mechanical and Aerospace Engineering, Rutgers University, Piscataway, NJ, USA.

Electrophoresis
|February 4, 2016
PubMed
Summary
This summary is machine-generated.

High electric fields significantly boost electrokinetic velocities in microfluidic devices, enabling rapid particle manipulation and fluid control for diverse applications.

Keywords:
Electroosmotic velocityElectrophoretic velocityHigh electric fieldsMicroPIV

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Area of Science:

  • Physics
  • Fluid Dynamics
  • Electrokinetics

Background:

  • High electric fields can influence fluid flow and particle movement.
  • Previous studies have not fully quantified these effects at large Peclet numbers.

Purpose of the Study:

  • To quantify the influence of high electric fields on fluid flow and particle velocities.
  • To investigate electrokinetic phenomena in microfluidic systems.

Main Methods:

  • Simultaneous particle image velocimetry and flow rate measurements.
  • Experiments conducted in polydimethylsiloxane channels with polystyrene particles and DI water.
  • Application of electric fields ranging from 100 V/cm to 250,000 V/cm.

Main Results:

  • Achieved electrokinetic velocities up to three orders of magnitude higher than previously reported.
  • Measured maximum electroosmotic velocity of 3.55 m/s and electrophoretic velocity of 2.3 m/s.
  • Results show good agreement with nonlinear theoretical models for various Peclet numbers and concentration polarization regimes.

Conclusions:

  • High electric fields enable unprecedented electrokinetic velocities.
  • These findings support potential applications in particle manipulation, microfluidic mixing, and microthrust generation.