Professional Detailing1 min read

Droplet Test Sequences: Do Not Reuse a Wetted Location Without a Defined Method

Placing a new test drop on a previously wetted location may not reproduce the original surface condition. Use the method's location and sequencing requirements rather than assuming each drop is an independent fresh measurement.

Updated · NANOLAB Knowledge

The key distinction

Prior liquid contact, removal or cleaning becomes part of the specimen history. The trial should distinguish repeated testing of one location from measurements on fresh locations, because those designs answer different questions.

Practical checks

  1. Define the sequence and allowed reuse of locations.
  2. Map each tested region.
  3. Record any cleaning or reconditioning before another measurement.

Example

Illustrative example: an operator removes a drop and immediately measures another at the same spot, then reports both as independent fresh-surface readings. The shared location and prior exposure should remain visible.

Scope and limits

Do not wipe or recondition a specimen using an improvised method. The laboratory should determine whether the location remains suitable for the intended measurement.

Related guidance

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

Professional Detailing2 min read

DLS Intensity and Number Distributions: Do Not Swap the Axis Label

A particle-size distribution must retain the basis on which it is reported. Intensity, volume and number distributions are different representations, and changing the label can change the apparent meaning of a coating ingredient's size data.