Drop impact on thin powder layers: pattern formation by air entrapment

We conducted a systematic investigation of droplet evaporation on different surfaces. We found that droplets formed even with distilled water do not disappear with evaporation but instead shrink to a residue of a few micrometers lasting over 24 h. The residue formation process differs across surfaces and humidity levels. Specifically, under 40% relative humidity, 80% of droplets form residues on plastic and uncoated and coated glass, while less than 20% form on stainless steel and none on copper. The formation of residues and their variability are explained by modeling the evaporation process considering the presence of nonvolatile solutes on substrates and substrate thermal conductivity. Such variability is consistent with the survivability of SARS-CoV-2 measured on these surfaces. We hypothesize that these long-lasting microscale residues can potentially insulate the virus against environmental changes, allowing them to survive and remain infectious for extended durations.

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Droplet evaporation residue indicating SARS-COV-2 survivability on surfaces

Zhang

Shao

et al. 2021

Physics of Fluids

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Drop impact on thin powder layers: pattern formation by air entrapment

Abstract: Drops impacting on thin powder layers can form fascinating patterns of powder particles by the interplay of processes such as micro-bubble generation and large air-disc entrapment.

Cited by 1 publication

References 45 publications

Droplet evaporation residue indicating SARS-COV-2 survivability on surfaces

Droplet evaporation residue indicating SARS-COV-2 survivability on surfaces

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