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Related Concept Videos

Potentiometry: Overview01:06

Potentiometry: Overview

4.9K
Potentiometry is an analytical technique that measures the potential difference between two electrodes in an electrochemical cell without drawing any significant current that could alter the solution's composition. This method employs an indicator electrode, which exchanges electrons with the analyte solution, and a reference electrode with a constant potential. Each electrode is immersed in a solution comprised of two half-cells. In a conventional setup, the reference electrode serves as...
4.9K
Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

786
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.
The chosen potential...
786
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

1.9K
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
1.9K
Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

2.2K
Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
2.2K
Potentiometric Titration: Overview01:31

Potentiometric Titration: Overview

4.8K
Potentiometric titration is a quantitative analytical technique that determines the concentration of an analyte by measuring the potential difference between the two electrodes in the solution. The endpoint of a potentiometric titration is the point at which there is a significant change in the potential difference. It occurs when the stoichiometric reaction between the analyte and the titrant is complete. The endpoint is usually determined graphically by plotting the measured potential...
4.8K
Voltammetric Techniques: Linear-Scan (E vs Time)01:12

Voltammetric Techniques: Linear-Scan (E vs Time)

1.4K
Polarography is a classical voltammetric technique used to analyze electrochemical reactions. This method applies a linear potential sweep to a dropping mercury electrode (DME), and the resulting current is measured. A dropping mercury electrode is commonly used as the working electrode in polarography. It consists of a capillary tube filled with mercury, where the tiny droplet forms at the tip. This droplet continuously drops from the capillary, creating a new electrode surface for each...
1.4K

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Related Experiment Video

Updated: Feb 28, 2026

Determination of Zeta Potential via Nanoparticle Translocation Velocities through a Tunable Nanopore: Using DNA-modified Particles as an Example
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Determination of Zeta Potential via Nanoparticle Translocation Velocities through a Tunable Nanopore: Using DNA-modified Particles as an Example

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Low-Cost Zeta Potentiometry Using Solute Gradients.

Sangwoo Shin1, Jesse T Ault2, Jie Feng2

  • 1Department of Mechanical Engineering, University of Hawaii at Manoa, Honolulu, HI, 96822, USA.

Advanced Materials (Deerfield Beach, Fla.)
|June 10, 2017
PubMed
Summary

A new, low-cost method measures zeta potential for particles and solid walls simultaneously using solute gradients. This technique offers a simpler, more accessible approach for characterizing surface properties in various scientific fields.

Keywords:
colloidsdiffusioosmosisdiffusiophoresissurface chargezeta potential

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Dynamic Electrochemical Measurement of Chloride Ions
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Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone

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Last Updated: Feb 28, 2026

Determination of Zeta Potential via Nanoparticle Translocation Velocities through a Tunable Nanopore: Using DNA-modified Particles as an Example
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Dynamic Electrochemical Measurement of Chloride Ions
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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Materials Science

Background:

  • Zeta potential is a critical physicochemical surface property crucial in electrochemistry, pharmaceuticals, and materials science.
  • Current methods for measuring zeta potential, such as electrophoretic light scattering for particles and streaming potential/electroosmotic mobility for walls, are often expensive and complex.
  • There is a need for simpler, more robust, and cost-effective techniques for characterizing zeta potential.

Purpose of the Study:

  • To develop a simple, robust, and cost-effective method for simultaneously measuring the zeta potential of particles in suspension and solid walls.
  • To utilize diffusiophoresis and diffusioosmosis, driven by solute gradients, for zeta potential determination.
  • To demonstrate a compact, low-cost zeta potentiometry tool for both particle and wall measurements.

Main Methods:

  • Inducing particle motion (diffusiophoresis) and fluid motion (diffusioosmosis) using controlled solute gradients.
  • Visualizing and analyzing particle dynamics to independently determine the zeta potential of both particles and the surrounding solid wall.
  • Employing a compact microscope for a low-cost implementation of the zeta potentiometry technique.

Main Results:

  • Successfully demonstrated a method for simultaneous zeta potential measurement of particles and solid walls.
  • The developed technique relies on the sensitivity of diffusiophoresis and diffusioosmosis to surface charge.
  • A compact microscope setup enabled low-cost zeta potentiometry, validating the method's practicality.

Conclusions:

  • The presented method offers a simple, robust, and cost-effective alternative for zeta potential characterization.
  • This technique is valuable for applications in pharmaceuticals, materials science, and educational settings.
  • The simultaneous measurement capability enhances the utility of zeta potential analysis.