An induced current method for measuring zeta potential of electrolyte solution-air interface

Area of Science:

• Electrochemistry
• Surface Science
• Analytical Chemistry

Background:

• The zeta potential at the electrolyte solution-air interface is crucial for understanding surface phenomena.
• Existing methods for zeta potential measurement can be complex and time-consuming.

Purpose of the Study:

• To develop a novel, simple, and rapid method for measuring the zeta potential of electrolyte solution-air interfaces.
• To establish a reliable correlation between measured electrical signals and zeta potential values.

Main Methods:

• An electrode is inserted into the electrolyte solution-air interface to generate an electrical current.
• The amplitude of the measured electrical signal is recorded.
• A linear correlation between signal amplitude and zeta potential is determined experimentally.

Main Results:

• The measured electrical signal amplitude is linearly proportional to the potential difference at the interface.
• The signal amplitude depends solely on the zeta potential, irrespective of electrolyte type or concentration.
• The method was validated using NaCl, MgCl2, and CaCl2 solutions across various pH and concentration ranges.

Conclusions:

• This novel method provides a quick and easy way to evaluate the zeta potential of electrolyte solution-air interfaces.
• The established correlation allows for straightforward zeta potential determination using a simple electrical measurement.
• The technique offers a valuable tool for surface characterization in diverse electrolyte systems.