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Index > Aerosol Products > Particle Sizers > High Flow DMA

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A differential mobility analyzer for scaling-up size-selection of in-flight nanoparticles

·It operates at aerosol/sheath flow rates of 200/2000 slpm and a maximum voltage of 35 kV.

·It classifies particles up to 50 nm (mobility equivalent diameter) with a resolution of 10.

·High-vacuum compatible (10-5 mbar).

·Protected under patent.

·High yield production of monodisperse size-selected NPs.

·Functional applications:Thin-films for electronic, optic, optoelectronic, photonic devices & sensors.

·Health & environmental studies: Toxicity & ecotoxicity of NPs.

·Atmospheric research: Size-dependent chemical analysis of atmospheric aerosols

·Aerosol standards: NPs of well-defined composition & size for calibration of aerosol instrumentation

·Filter assessment:Size-dependent filtration efficiency for NPs

·Fundamental research: Dynamics of NPs in turbulent flows Concentrated aerosol (> 107 #/cm3) studies

A facility for high yield (mg/h) production of size-selected, high purity metal nanoparticles Assessment

The MegaDMA of RAMEM is being tested at the BigMAG facility of the Institute for Nanostructures and Technology (NST) of the University of Duisburg-Essen (Germany)

Metallic titanium aerosols are generated by electrical discharge (spark, mini-arc,…) in an inert gas stream at flow rates of 100 to 300 slpm.

Aerosols with mean size 40-50 nm have been obtained so far. Particles are bipolarly charged and show multiple charge states.

Feasibility of the High Flow DMA has been demonstrated through mobility classification of these particles.

Next steps will decrease particle size and charge state in order to get monodisperse size distributions.

Size distribution of particles of mobility Z=6,66·10-3 cm2/(V·s) classified by the MegaDMA (V=-7,5 kV). Peaks correspond to NPs of different sizes & charge states.