Microparticle adhesion and removal is critical in many scientific and engineering applications, including non-contact sampling, environmental and occupational health assessments, industrial applications, and surface cleaning. Theoretical models and established methods for the measurement of adhesion forces are limited in their applications; these methods typically measure normal (lift) force and do not account for laterally applied forces, such as drag force and the resulting moments that are prevalent in many real-world resuspension scenarios
 
We have developed an experimental method for characterization of removal thresholds and forces for removal of non-spherical organic particles (trace explosives) for the development of effective aerodynamic sampling units. The aerodynamic measurement method is very sensitive to the surface and the particle roughness parameters: at the inception of the rolling motion, the particle may need to overcome the effect of asperities on the test surface or the particle surface. Chemical analysis  (LC-MS) is used to investigate removal from opaque and irregular surfaces commonly encountered at centers of interest like airports, malls etc.
 
This work can be used as a baseline for future resuspension studies, designs of practical systems, and model validation studies. Please contact us for more information and collaborations.

Refereed publications

  1. Kottapalli K., Novosselov I.V., Experimental Study of Aerodynamic Resuspension of RDX Residue, Aerosol Science and Technology 2019 [doi]
  2. Fillingham P., Novosselov I.V., Similarity of the Wall Jet Resulting from Planar Underexpanded Impinging Jets,arXiv preprint arXiv:1812.11220 [Preprint]
  3. Fillingham P., Kottapalli K., Zhan X., Novosselov I.V., Characterization of adhesion force in aerodynamic particle resuspension. Journal of Aerosol Science 2019, 128, 89-98. [doi]
  4. P. Fillingham, H. Murali, I. V. Novosselov, Nondimensional Parameter for Characterization of Wall Shear Stress From Underexpanded Axisymmetric Impinging Jets. ASME. J. Fluids Eng. 2017;139(11) [doi]
  5. Ryan Keedy1, Evan Dengler1, Peter Ariessohn, Igor Novosselov, Alberto Aliseda, Removal Rates of Explosive Particles from Surfaces by Impingement of a Gas Jet, Aerosol Science and Technology, v 46, n 2, p 148-155, 2012 [doi]