Scientists at the Nanoscale Physics Research Laboratory at the University of Birmingham, UK, have broken a record by creating the world's smallest Valentine's heart . It is made from palladium and gold atoms placed on a carbon film. It measures only 5 nanometers by 3.5 nanometers, too tiny to be visible by the human eye, and even to observe it with the aid of a conventional light microscope. The images have been taken with an electron microscope and subsequently colored by computer.
To get the nanoparticles in a heart shape, Professor Ziyou Li and his colleagues had to heat them to 200-300 ° C. In this way, they also managed to keep the figure stable.
