Nanotechnology

Nanotechnology — manipulating matter at the nanometer scale (1-100 nm, or 1 billionth of a meter) — was theorized by physicist Richard Feynman in his 1959 lecture 'There's Plenty of Room at the Bottom' and named by Norio Taniguchi in 1974. At the nanoscale, quantum effects and surface-area-to-volume ratios produce properties radically different from bulk materials: gold appears red, carbon forms incredibly strong tubes, silver becomes antimicrobial. Current applications: nanoparticle drug delivery (lipid nanoparticles in mRNA COVID vaccines — the delivery mechanism that protects the mRNA and allows it to enter cells — is a key nanotechnology success); carbon nanotubes (electronics, stronger-than-steel composites); quantum dots (LED displays, solar cells); nano-silver (antibacterial coatings); titanium dioxide nanoparticles (sunscreens). Theoretical applications: nanomachines navigating the bloodstream to destroy cancer cells; self-healing materials; atomic-scale computer chips; molecular assemblers. The theoretical limits of nanotechnology (if molecular assemblers worked) could transform manufacturing entirely.