Evaporation dynamics of layered droplets is of interest in many natural and industrial processes. The presence of a layer, which acts as a diffusional barrier to the transfer of a species from the core droplet to the gas phase, gives rise to a number of rate-controlling mechanisms. To examine evaporation dynamics of volatile core droplets coated with layers of nonvolatile components we have conducted experiments on single layered droplets suspended in an electrodynamic balance under vapour-free atmospheres, and determined the core and outer radii of a droplet as functions of time using a resonance based light scattering technique. A theoretical analysis is presented to explain the observed evaporation characteristics of layered droplets of various systems.
