Analysis of physical processes of passive particle transport and deposition in the atmosphere for the development of smart dust swarm technologies

This paper examines the physical foundations of atmospheric particle transport and deposition to justify design choices for Smart Dust swarm technologies. A comparative analysis is carried out for micron sized soot particles and sub millimeter Smart Dust particles, including the dominant forces, flow regimes, settling behavior and characteristic atmospheric lifetimes. The study shows that the transition from micron to sub millimeter sizes leads to a shift of the dominant mechanisms from turbulent diffusion and wet scavenging to wind driven transport and gravitational sedimentation, which makes it possible to define target aerodynamic parameters for delivering Smart Dust into the zone of maximum pollution. Based on these findings, several engineering strategies to achieve the required settling behavior are formulated and qualitatively assessed, including matrix type composite carriers, lightweight functional materials, aerodynamically shaped particles and buoyancy assisted structures, and their limitations are discussed in terms of technological feasibility and applicability to environmental monitoring systems.