Aerosol flow through a long micro-capillary: collimated aerosol beam
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- Akhatov, I.S., Hoey, J.M., Swenson, O.F. et al. Microfluid Nanofluid (2008) 5: 215. doi:10.1007/s10404-007-0239-3
A micro-capillary system capable of generating a focused collimated aerosol beam (CAB) is demonstrated both theoretically and experimentally. The approach is based on a manifestation of the Saffman force where high velocity (∼100 m/s) aerosol particles, flowing through a micro-capillary (d ∼ 100 μm and l ∼ 1 cm), migrate perpendicular to the centerline of the capillary. Upon exiting the micro-capillary system, the particles maintain momentum, and when the aerosol is comprised of solid-in-liquid dispersions such as Ag nanoparticle ink, the CAB approach enables printing of advanced materials features with linewidth ≤ 10 μm.