Patent ID: 8343773

Claim:
A process for making a microcapsule array comprising: forming outer layers on the surfaces of a plurality of core particles to form a plurality of microcapsules, each of said microcapsules comprising an outer layer defining a microcapsule interior and said microcapsule interior having one of the core particles therein; and locating the microcapsules, each having one of the core particles in the microcapsule interior thereof, on a surface; removing the core particles from the microcapsules to form hollow microcapsules; wherein the outer layers have a permeability towards a nanoscale species which is dependent on an environmental condition to which said array is exposed; wherein the surface comprises a plurality of microwells whereby the step of locating locates at least some of the microcapsules, each having one of the core particles in the microcapsule interior thereof, each at least partially within one of the microwells.