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Nanoparticle Production with Stirred‐Media Mills: Opportunities and Limits
Author(s) -
Knieke C.,
Steinborn C.,
Romeis S.,
Peukert W.,
BreitungFaes S.,
Kwade A.
Publication year - 2010
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201000105
Subject(s) - grinding , breakage , viscosity , suspension (topology) , limit (mathematics) , materials science , rheology , particle (ecology) , nanoparticle , metallurgy , nanotechnology , composite material , mathematics , mathematical analysis , oceanography , homotopy , pure mathematics , geology
Nanoparticles can be produced by wet grinding in stirred‐media mills. In the lower nanometer range a true grinding limit exists, where the transferred energy from the grinding media is no longer sufficient to induce further breakage of the particles even after stressing events with high stress energies. Variations in process conditions lead to the conclusion that the grinding limit is hardly affected by most of the investigated process parameters. However, at high solids concentrations and/or small particle sizes, a drastic increase in suspension viscosity occurs, which leads to a dampening of the grinding media motion and to a reduction in the transferred stress energy. Hence, the rheological behavior can limit the grinding process, and a viscous dampening‐related grinding limit can be reached prior to the true grinding limit.