TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The nanoparticles have a refractive index such that, when they are formulated into a coating comprising 30 wt.% nanoparticles and 70 wt.% silica, the coating has a refractive index as measured by ellipsometry of less than or equal to 1.38. The particles are mesoporous. The pores of the nanoparticles have an internal surface at least partially comprising a hydrophobic layer. Preferred Method: The mixing step forms a colloidal suspension of porous organosilica nanoparticles in the form of micelles.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The bis silane is a bis(alkyloxy) silane, preferably a bis(trialkyloxy) silane. The bis(trialkyloxy) silane is 1,2-bis(triethoxysilyl) methane or 1,2-bis(triethoxysilyl) ethane. The mixing step additionally comprises a mono silane, preferably 1,2-bis(triethoxysilyl) ethane. The organic templating agent is triethanolamine. The base is triethanolamine. The surfactant is cetyltrimethylammonium chloride. EXAMPLE - 9.6 g Solution A (1 g triethanolamine and 9 g deionized water) and 480 g solution B (mixture of 450 g de-ionized water and 50 g aqueous cetyltrimethylammonium chloride solution) were placed in a flask, stirred and heated to 70 degrees C. A silane solution was prepared by mixing 32.68 g tetraethoxysilane, 5.38 g phenyltriethoxysilane and 11.92 g 1,2-bis(triethoxysilyl)ethane. After stirring for 30 minutes, 38.4 ml of the silane solution was added to the reaction flask and left stirring at 70 degrees C for 1 hour. An acidified ethanol solution was prepared by diluting 200 g concentrated hydrochloride to 2 l with ethanol. The mixture was removed from the heat and 460 ml of the acidified ethanol was added to the reaction mixture and stirred and decanted into 24 centrifuge tubes and then spun at 15000 rpm for 10 minutes. The supernatant was poured off and 18 ml of ammonium nitrate solution was added to each tube. The solid was then re-dispersed using vortex mixing and ultra-sonication. Each tube was then filled with de-ionized water, shaken and spun at 21000 rpm for 10 minutes. The supernatant was again poured off and 18 ml of the acidified ethanol was added to each tube. The solid was again re-dispersed using vortex mixing and ultra-sonication. Each tube was then filled with de-ionized water, shaken and spun at 21000 rpm for 10 minutes. The supernatant was poured off again and 10 ml of ethanol was added to each tube. The solid was then re-dispersed using vortex mixing and ultra-sonication. The resultant dispersions were recombined into a single container to yield nanoparticles.