Counting Small Particles in Electron Microscopy Images-Proposal for Rules and Their Application in Practice.

Area of Science:

• Materials Science
• Nanotechnology
• Analytical Chemistry

Background:

• Electron microscopy (EM) is crucial for nanoparticle morphology characterization.
• Challenges exist in particle identification, dispersion, and counting methods for size distribution analysis.
• Inconsistent counting protocols affect measurement accuracy and reproducibility.

Purpose of the Study:

• To establish precise rules for counting particles in EM micrographs.
• To compare the impact of different counting methods on particle size distribution.
• To support standardized counting approaches for regulatory compliance and reliable nanomaterial characterization.

Main Methods:

• Review and comparison of four commonly used particle counting methods in EM.
• Application of selected counting rules in case studies.
• Analysis of the influence of counting rules on final particle size distribution.

Main Results:

• Different counting rules significantly impact the obtained particle size distribution.
• The choice of counting method directly affects measurement accuracy and reproducibility.
• Highlighting the influence of counting methodology on nanoparticle characterization outcomes.

Conclusions:

• A specific, well-defined particle counting approach is essential for reliable and reproducible results.
• Standardized counting methods are vital for harmonized measurement procedures in nanomaterial analysis.
• Adherence to precise counting rules enhances the accuracy of nanoparticle size and shape distribution determination.