Properties and uses Small sizes. Because of their submicroscopic size, they have unique material characteristics, and manufactured nanoparticles may find practical applications in a variety of areas, including medicine, engineering, catalysis, and environmental remediation. Nanoparticulate materials are used in some paints, cosmetics and sunscreens. ratios of nanoparticles.

They can be mixed into other materials to form composite materials with improved properties. They have very large surface area to volume ratios. Nanoparticles exist in the natural world and are also created as a result of human activities. Sunscreens block harmful ultraviolet light. Nanoparticles are 1 nm to 100 nm in size. Nanoparticles are now being used in the manufacture of scratchproof eyeglasses, crack- resistant paints, anti-graffiti coatings for walls, transparent sunscreens, stain-repellent fabrics, self-cleaning windows and ceramic coatings for solar cells. Nanoparticles can contribute to stronger, lighter, cleaner and “smarter” surfaces and systems. Nanoparticles are so small that they can enter biological tissue. Nanoparticles have very large surface area to volume ratios compared to the same material in bulk, as powders, lumps or sheets. The properties of nanoparticulate substances are different from those of the same substance in bulk.

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