We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Aerosol classification by dielectrophoresis: a theoretical study on spherical particles.
- Authors
Lorenz, Malte; Weber, Alfred P.; Baune, Michael; Thöming, Jorg; Pesch, Georg R.
- Abstract
The possibilities and limitations using dielectrophoresis (DEP) for the dry classification of spherical aerosol particles was evaluated at low concentrations in a theoretical study. For an instrument with the geometry of concentric cylinders (similar to cylindrical DMA), the dependencies of target particle diameter d P ∗ , resolution, and yield of the DEP classification on residence time, applied electric field strength, and pressure of the carrier gas were investigated. Further, the diffusion influence on the classification was considered. It was found that d P ∗ scales with the mean gas flow velocity u gas , classifier length L, and electric field strength E as d P ∗ ∝ (u gas / L) 0.5 E - 1 . The resolution of the classification depends on the particle diameter and scales proportionally to d P ∗ 1.3 . It is constrained by the flow ratio β (i.e., sheath gas to aerosol flow), electrode diameters, and applied electric field strength. The classification yield increases with the ratio of the width of the extended outlet slit s e to the diffusion induced broadening σ z . As expected, resolution and yield exhibit opposite dependencies on s e / σ z . Our simulations show that DEP classification can principally cover a highly interesting particle size range from 100 nm to 10 μ m while being directly particle size-selective and particle charge independent.
- Subjects
AEROSOLS; DIELECTROPHORESIS; ELECTRIC fields; PARTICLE size determination; ELECTRODE potential
- Publication
Scientific Reports, 2020, Vol 10, Issue 1, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/s41598-020-67628-9