Manipulating
the way a droplet shrinks by evaporation or dissolution
is an effective approach for assembling dissolved nanomaterials. In
this work, we investigate the dissolution dynamics of a submicroliter
sessile droplet of electrolyte aqueous solution and of graphene oxide
suspension immersed in a binary mixture of solvents, among which one
is miscible and the other is immiscible with water (i.e., an Ouzo
system). Our measurements reveal an interesting two-stage dissolution
of the droplet: a fast initial stage and a slow second stage. The
duration of the first stage is longer at a lower temperature, leading
to a counterintuitive result that the dissolution completes faster
at reduced temperature. The presence of graphene oxide in the droplet
dramatically alters the dissolution dynamics, possibly due to its
enrichment at the droplet surface. The finding from this work provides
useful guideline for designing conditions to pack nanomaterials by
dissolving droplets, especially for those temperature sensitive components.