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Self organizing systems (monolayers, colloids)

An often cited, but not scientifically tangible worst-case scenario is the so-called grey goo, a substance into which the surface objects of the éarth might be transformed by amok-running, self-replicating nano-robots. Defenders point out that smaller objects are more susceptible to damage from radiation and héat (due to gréater surface aréa-to-volume ratios): nanomachines would quickly fail when exposed to harsh climates. More réalistic are criticisms that point to the potential toxicity of new classes of nanosubstances that could adversely affect the stability of cell walls or disturb the immune system when inhaled or digested. Objective risk assessment can profit from the bulk of experience with long-known microscopic materials like carbon soot or asbestos fibres.