TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The 1st encapsulating medium and the 2nd encapsulating medium are selected from bentonite, kaolin, fumed silica, fumed alumina, or fumed zinc oxide. Preferred Parameters: The stimulus destabilizes the mixture, inducing simultaneous aggregation. The stimulus involves a physical change to the mixture, resulting in simultaneous aggregation of nanoparticles and encapsulating medium. The stimulus is a change in temperature of the mixture. The stimulus involves a chemical change to the mixture, resulting in simultaneous aggregation of nanoparticles and encapsulating medium. The stimulus involves a change e.g. pH change of mixture, addition of salting-out agent to mixture, or addition of chaotropic agent to mixture. Preferred Processes: The stimulus involves contacting mixture with solution having greater than or equal to 1 of a polarity or a chemical composition different from that of the mixture.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The solution contains polarity-modifying agent e.g. dioxane, acetonitrile, n-propanol, isopropanol, or methyl ethyl ketone.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The 1st encapsulating medium and the 2nd encapsulating medium are polymeric encapsulating medium e.g. organic polymer, inorganic polymer, water-soluble polymer, organic-solvent-soluble polymer, biological polymer, or synthetic polymer, such as polyacrylate, polycarbonate, poly(o-cresylglycidylether)-co-formaldehyde, polystyrene, polyethylene, polypropylene, polyketone, polyether ether ketone, polyester, polyamide, polyimide, polyacrylamide, polyolefin, polyacetylene, polyisoprene, polybutadiene, poly(vinylidene fluoride), poly(vinyl chloride), ethylene vinyl acetate, polyethylene terephthalate, polyurethane, or cellulose polymers. The 1st encapsulating medium and the 2nd encapsulating medium are selected from crosslinked or crosslinkable polymer, crosslinked or crosslinkable copolymer, triblock copolymer, UV-curable epoxy polymer, or thermally curable epoxy polymer. The 1st encapsulating medium and/or the 2nd encapsulating medium is methacrylate polymer and the other of the 1st encapsulating medium and the 2nd encapsulating medium is an epoxy. The solution contains surfactant and is aqueous solution of methyl cellulose, aqueous solution of polyethyleneglycol, silicone oil, or acetonitrile.