NMR relaxation measurements and powder wettability by Mageleka

When starting with a dry powder, the formulation of any suspension or slurry involves three distinct steps – wetting, dispersing and stabilizing. The initial step, wetting, is described as the affinity of a liquid for a surface, and this is an important characteristic of solid-liquid dispersions. Moreover, it is crucial to understanding how dispersibility impacts industrial processes and applications. The physical interaction between a liquid and a solid can vary enormously from case-to-case; different situations often require different wetting behavior.

This application note explores NMR relaxation measurements as a simple means of determining the wetting efficiency of powders directly, and introduces the Mageleka MagnoMeter XRS relaxometer as a compact and powerful instrument for routine analysis of this kind.