Quantum dots — semiconductor nanocrystals that have custom designable optical properties — are opening up opportunities in the bio-imaging, display and lighting sectors, reports Duncan Graham-Rowe.

Quantum dots are crystals of a fluorescent semiconductor material with a diameter of as few as 10 to 100 atoms (2-10 nm). They are used as labels for imaging molecules because of their very narrow ...

What are polka-dot nails? Polka-dot nails are, unsurprisingly, exactly what they sound like. The manicure features any color nail base (or even a French manicure base) with polka dots on top. The ...

Dot and cross diagrams help us to model when ions are formed from atoms. Here’s an example using sodium and chlorine. They form ions which bond to form sodium chloride. 2. Work out how many electrons ...