# Nanoparticle

## Common nanoparticles

Usually nanoparticles are not atomically precise and thus of little use for atomically precise manufacturing.

For something to qualify as a "nanoparticle" the following criteria must be met:

• it must be a pieces of matter in the solid state
• it must have a size smaller than a micrometer (= 1000 nanometers)
• it must not be too strongly bond to identical particles and it must not be too strongly bond to a substrate.
=> among others (e.g. high surface area makes high reactivity) easy spilling due to unbondedness is a reason why toxicity considerations are so important for nanoparticles

## Atomically precise nanoparticles

Often:

• produced by chemical means
• containing metals (e.g. gold)
• crystalline (also called: "nano crystals") - otherwise they most likely get called otherwise.

Atomically precise nanoparticles may be useful for in the path to advanced productive nanosystems.