Nanoscience and nanotechnology: is there a difference?
The prefix “nano” comes from the Greek word for dwarf. Nanoscience is the study of structures and molecules at the scale of nanometers, focused mainly on describing them. Nanotechnology takes that description and converts it into practical applications across physics, chemistry, biology, engineering, and medicine. The distinction matters because most of the history below is really nanoscience discovered by accident, centuries before anyone had a framework to turn it into deliberate technology.
Used long before it had a name
The level of understanding was obviously different, but early, unintentional nanotechnology shows up surprisingly far back. The Lycurgus Cup, a Roman glass object dated to the fourth century AD, is the oldest known example of dichroic glass — glass that changes color depending on the lighting. Analysis using electron microscopy and X-ray techniques on fragments has shown that the color-shifting effect comes from silver-gold alloy nanoparticles roughly 50–100 nanometers across, dispersed through the glass; different particle sizes scatter and absorb light differently, producing different colors depending on whether light passes through the glass or reflects off it.
A similar principle appears in the stained glass windows typical of medieval churches. The vivid yellows, reds, blues, and greens come from the same underlying mechanism: silver and gold nanoparticles of varying sizes and shapes fused into the glass, each producing a different hue.
Sword-making shows the same pattern. Metallurgical studies of historic Damascus steel blades have found carbon nanotube and cementite nanowire structures in the metal — a byproduct of the forging process that its smiths could not have understood in modern terms, but which measurably contributed to the blades’ strength and edge retention.
The physicist Michael Faraday studied the optical behavior of gold and silver nanoparticles in the nineteenth century, well before the tools existed to directly observe particles at that scale — his work on colloidal gold is still cited as an early foundation for nanoparticle optics.
The modern era begins
Richard Feynman’s 1959 talk, often cited as “There’s Plenty of Room at the Bottom,” proposed manipulating matter atom by atom — a concept that stayed largely theoretical until 1981, when Gerd Binnig and Heinrich Rohrer built the scanning tunneling microscope. That instrument, for the first time, let researchers directly image surfaces at atomic resolution, and it earned Binnig and Rohrer the 1986 Nobel Prize in Physics.
The carbon breakthroughs
In 1985, Richard Smalley, Harold Kroto, and Robert Curl discovered a new, spherical form of carbon: C60 and C70, the fullerenes. The three shared the 1996 Nobel Prize in Chemistry for the discovery, which opened an entirely new branch of carbon chemistry. A few years later, Sumio Iijima described carbon nanotubes, prized for their combination of tensile strength and electrical conductivity. In 2004, a new class of carbon nanomaterials — carbon dots — was found largely by accident during purification of carbon nanotubes, and the same year, Andre Geim and Konstantin Novoselov isolated graphene, which later earned them the 2010 Nobel Prize in Physics.
Where nanomaterials show up today
Since the early 2000s, nanomaterials have moved from laboratory curiosities into everyday products: lightweight carbon-fiber bike frames and tennis rackets, scratch-resistant glass coatings, antibacterial textile finishes, and the thin-film coatings used in phone and television displays. The most active area of current research, though, is biomedicine. Fullerene derivatives and other nanoparticles are being investigated as drug-delivery vehicles and as agents that can modulate immune response, with the long-term goal of more targeted tumor treatments than conventional chemotherapy allows.
That same ubiquity raises an open question that the field has not fully answered: what happens with long-term, low-level human and environmental exposure to engineered nanoparticles. Toxicology research on nanomaterials is active and ongoing, and remains one of the more important unresolved threads connecting nanoscience back to public health.
Editorial note
This article summarizes established history of science and is intended as general-audience background reading for workshop attendees, not as toxicological or medical guidance. It was originally published to accompany an earlier edition of NSTools and has been reviewed and lightly updated for accuracy.