Optomechanical measurement of single nanodroplet evaporation with millisecond time-resolution

Samantha Sbarra, Louis Waquier, Stephan Suffit, Aristide Lemaître and Ivan Favero ()
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Samantha Sbarra: CNRS
Louis Waquier: CNRS
Stephan Suffit: CNRS
Aristide Lemaître: CNRS
Ivan Favero: CNRS

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract Tracking the evolution of an individual nanodroplet of liquid in real-time remains an outstanding challenge. Here a miniature optomechanical resonator detects a single nanodroplet landing on a surface and measures its subsequent evaporation down to a volume of twenty attoliters. The ultra-high mechanical frequency and sensitivity of the device enable a time resolution below the millisecond, sufficient to resolve the fast evaporation dynamics under ambient conditions. Using the device dual optical and mechanical capability, we determine the evaporation in the first ten milliseconds to occur at constant contact radius with a dynamics ruled by the mere Kelvin effect, producing evaporation despite a saturated surrounding gas. Over the following hundred of milliseconds, the droplet further shrinks while being accompanied by the spreading of an underlying puddle. In the final steady-state after evaporation, an extended thin liquid film is stabilized on the surface. Our optomechanical technique opens the unique possibility of monitoring all these stages in real-time.

Date: 2022
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DOI: 10.1038/s41467-022-34219-3

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