•catalysis (high surface area, controlled crystal
surfaces)
•optical properties (sun screen, hyperthermic cancer
treatment, fluorescent tags)
•light scattering (smoke./fog screens)
•drug delivery (inhalation asthma, timed drug
release.
•pesticide delivery (fogging and fumigation)
•magnetic recording (orient magnetic domain axis,
important for hard drives, video
& audio tapes)
•pigments, inks, paints (coloring and opacity)