This process was repeated 2-3 times to get pure heterocoagulated capsules with no free silica capsule or latex articles. Most of the personal care actives and perfume capsules are lower density and hence this method of creaming may work better for such lower density capsules. For capsules that are denser than water, the capsules could be allowed to settle, and a similar procedure could be adopted by removing the top layer and repeating the washing steps. Dark field microscopy of (i) silica capsule and (ii) hetero-coagulated silica capsules with poly-NIPAM latex particles Evidence of temperature responsive poly-NIPAM latex particles adsorbing on CTAB stabilized silica capsules was demonstrated by careful optical microscopic analysis at various stages of the adsorption and poly-NIPAM film formation on the surface of the silica capsule. In the case of silica microspheres, SEM cannot be used as a characterization tool as microcapsules (e.g. having a size above 50 micrometer (> 50 pm)) do not stay/remain stable under high vacuum conditions employed during measurement (e.g. SEM imaging). Therefore, the adsorption and film formation of poly-NIPAM latex particles on silica hollow spheres were demonstrated by dark field microscopy (see FIG. 6B). FIG. 6A shows a dark field microscopic image of silica capsule dispersion in water. After heterocoagulation of poly-NIPAM latex particles with silica capsules, a dark field microscopic image was captured for the hetero-coagulated silica capsules with poly-NIPAM latex particles as shown in FIG. 6B. Particle size analysis of the hetero-coagulated silica capsules with poly-NIPAM latex particles using laser scattering shows a monomodal size distribution. This is indicative of a good nano-film formation of poly-NIPAM around the silica capsule structures.