Aerosol Characterization and Mobility Analysis Techniques
Summary
Aerosol characterisation and mobility analysis encompass methods to quantify the size, charge state, composition and dynamic behaviour of particulate matter suspended in gases. Central to these techniques is the exploitation of electrical mobility, whereby particles are segregated according to their drift velocity in an electric field. Differential mobility analysers coupled to condensation particle counters or particle size magnifiers enable the determination of number size distributions from the sub-nanometre to micrometre scale. Complementary approaches, such as aerosol mass spectrometry and aerodynamic classification, provide insights into particle density, morphology and chemical composition. Together, these methods inform models of atmospheric processes, human exposure, material synthesis and nanotechnology applications by revealing how particles nucleate, grow, agglomerate and respond to environmental conditions. By integrating mobility data with mass or optical measurements, researchers can infer effective density, mixing state and the influence of humidity or electrostatic interactions on particle dynamics. This multidisciplinary toolkit underpins advances in climate science, air quality management and engineered nanoparticle design.
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Aerosol Characterization and Mobility Analysis Techniques publication trend
The graph below shows the total number of articles in aerosol characterization and mobility analysis techniques across all publications each year (not limited to Nature Index journals).
Technical terms
Electrical mobility: The velocity of a charged particle under a unit electric field, reflecting its size and charge.
Differential Mobility Analyser (DMA): An instrument that classifies particles by electrical mobility using a controlled electric field and sheath flow.
Condensation Particle Counter (CPC): A detector that grows small aerosol particles into optically detectable droplets via supersaturated vapour.
Particle Size Magnifier (PSM): A device that enlarges nanometre-scale particles by condensing a working fluid, extending detection to sub-3 nm diameters.
Effective density: The mass per unit volume derived from the relationship between a particle’s mobility diameter and its aerodynamic diameter.
Aerodynamic diameter: A size metric that represents how a particle settles in air, incorporating its shape and density relative to a standard sphere.
References
- A quasi-one-dimensional model for ion-aerosol interactions and aerosol charge state downwind of corona-producing alternating current (AC) HVPL under stable atmospheric conditions. Environmental Research (2023).
- Mass and Mobility of Ions Produced by Radioactive Sources and Corona Discharges. Analytical Chemistry (2024).
- Overview of measurements and current instrumentation for 1–10 nm aerosol particle number size distributions. Journal of Aerosol Science (2020).
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