Overview
Nanotechnology studies structures roughly one to one hundred nanometers across. At this scale, surface area becomes large relative to volume and quantum effects may matter. Properties support coatings, electronics, sensors, and medicine. “Nano” does not guarantee novelty or safety: effects depend on material, shape, dose, and use.
Core ideas
Structure influences how materials absorb light, conduct electricity, or interact with molecules. Microscopy and spectroscopy characterize size and composition. Small particles may move differently through air, water, or organisms, making exposure important. Risk assessment considers hazard and exposure, alongside manufacturing controls and lifecycle impacts.
Try it
Draw a millimeter, divide it into ten parts, then continue by factors of ten toward a nanometer. Calculate surface-area-to-volume ratios for cubes of different sizes and explain how shrinking makes surfaces relatively important. This model illustrates scale, not actual nanoparticle hazards.
Study pathways
Study chemistry, physics, and materials science, then characterization and safety. Further reading: MIT OpenCourseWare includes materials science resources at https://ocw.mit.edu/.