Nanoparticle release from nanocomposites due to mechanical treatment at two stages of the life-cycle

Currently, an increase of published studies regarding nano-object release into the air can be observed. In the absence of a harmonized methodology only a few studies provide quantitative data for further use. In this study, an appropriate methodology was adopted and partly enhanced for the characterization of the nanoparticle release from coatings and composites containing nanoscaled pigments. Systematic analyses at two stages of the life-cycle (non-weathered/arterially weathered) were performed for three simulated treatment processes – sanding, dynamic friction and wind erosion. Results show that the sample material, the sample composition, the sample condition (e.g. weathering state) and the type of mechanical treatment have a strong effect on the particle release. SEM, TEM and EDX analyses revealed that none of the released particles were free nanoscaled pigments.