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\subsubsection{\texorpdfstring{Liquid metal nanodroplet dynamics inside nanocontainer}{Liquid metal nanodroplet dynamics inside nanocontainer}}
\label{sec:liquid_metal_nanodroplet_dynamics_inside_nanocontainer}


Here we report direct observations of spatial movements of
nanodroplets of Pb metal trapped inside sealed carbon nanocontainers.
We find drastic changes in the mobility of the liquid droplets as the
particle size increases from a few to a few ten nanometers. In open
containers the droplet becomes immobile and readily evaporates to the
vacuum environment. The particle mobility strongly depends on
confinement, particle size, and wetting on the enclosed surface. The
collisions between droplets increase mobility but the tendency is
reversed if collisions lead to droplet coalescence. The dynamics of
confined nanodroplets could provide new insights into the activity of
nanostructures in spatially constrained geometries.

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