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Formation of a mixed surfactant oil-in-water (O/W) microemulsion using Brij 97 ((1), filled circles, w + x + y = 10); and n-octadecyltrimethoxysilane ((2), open circles), followed by the formation of a stable shell through condensation of tetramethoxysiloxane (3) around the microemulsion droplet. The inset illustrates the polysiloxane/silicate network forming the shell. Reprinted from [31], © 2002 with permission from ACS Publications.
