Details

Autor(en) / Beteiligte

• Knüpfer, Paul
• Ditscherlein, Lisa
• Peuker, Urs Alexander

Titel

Nanobubble enhanced agglomeration of hydrophobic powders

Ist Teil von

• Colloids and surfaces. A, Physicochemical and engineering aspects, 2017-10, Vol.530, p.117-123

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2017

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• [Display omitted] •Hydrophobic particles agglomerate to larger clusters than hydrophilic ones.•Onto hydrophobic particles nanobubbles exist (due to solvent exchange).•The stability of hydrophobic agglomerates is higher compared to hydrophilic ones. Agglomeration of solid particles in aqueous liquid flows is generally influenced by the appropriate interacting forces. Between hydrophobic particles, these forces are dramatically increased compared to van der Waals forces due to the formation of capillary bridges, caused by nanobubbles located at the particle surface. In this study, both hydrophobic and hydrophilic agglomerates were generated in water with an agglomeration setup based on a stirred tank reactor. Variating the shear rate leads to different agglomeration sizes and provides information about the agglomerate strength. In principle, both stability and size of the hydrophobic agglomerates are larger than the hydrophilic ones. The presence of the nanobubbles is proved by applying atomic force microscopy to the particle surface.