Professional Detailing2 min read

Coating Particle Reports: Laser Diffraction and DLS Measure Different Responses

Before comparing particle-size reports for coating development, identify the measurement technique. A laser-diffraction distribution and a dynamic-light-scattering result should not be treated as interchangeable descriptions simply because both use nanometres.

Updated · NANOLAB Knowledge

The key distinction

Laser diffraction interprets angular light scattering using an optical model. DLS infers a hydrodynamic size from particle motion. Their measurement principles and distribution weightings differ, so a numerical disagreement alone does not establish that one batch changed.

Practical checks

  1. Record the technique, sample preparation and reported weighting.
  2. Ask the laboratory which comparison is meaningful for the formulation.
  3. Preserve the original distribution and method details with any summary.

Example

Illustrative example: a buyer receives a volume-based laser-diffraction report and an intensity-based DLS report. Comparing their headline sizes without method context could create a false supplier discrepancy.

Scope and limits

These methods do not independently establish coating durability, adhesion or suitability. An appropriate laboratory must select and interpret the technique for the actual material.

Related guidance

Technical references: Malvern Panalytical: laser diffraction; Malvern Panalytical: particle characterization techniques. These sources describe their stated methods or products; they do not certify NANOLAB products or establish compatibility with an unlisted surface.

Ask NANOLAB about the exact product and intended use. Use the current product documentation for formulation-specific instructions.

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