Real-Time Imaging of Microscopic pH Distribution with a Two-Dimensional pH-Imaging Apparatus.

Area of Science:

• Electrochemistry
• Analytical Chemistry
• Materials Science

Background:

• Real-time monitoring of chemical environments is crucial for understanding dynamic processes.
• Traditional pH measurement methods lack spatial resolution and speed for transient events.
• Visualizing pH distribution requires advanced imaging techniques.

Purpose of the Study:

• To develop and demonstrate a novel real-time two-dimensional (2D) pH imaging technique.
• To visualize the transient pH changes associated with proton release from cation-exchange resins.
• To evaluate the performance of cation-exchange resins using the developed pH imaging method.

Main Methods:

• Development of a new potentiometry-based method for 2D pH imaging.
• Achieving submillimeter spatial resolution for pH distribution visualization.
• Capturing transient pH changes with a short measurement time suitable for practical applications.

Main Results:

• Successful visualization of pH distribution as real-time 2D pH images.
• Observation and imaging of transient pH changes from a single cation-exchange resin.
• Demonstrated ability to evaluate cation-exchange resin performance based on the obtained pH images.

Conclusions:

• Real-time 2D pH imaging is feasible with the developed potentiometry technique.
• The method provides high spatial resolution and sufficient speed for observing dynamic pH events.
• This imaging approach offers a valuable tool for assessing material performance, particularly ion-exchange resins.