Graphical abstract. Credit: ACS Nano (2024). DOI: 10.1021/acsnano.3c07853 For the first time, scientists have successfully trapped atoms of krypton (Kr), a noble gas, inside a carbon nanotube to form a one-dimensional gas. Scientists from the University of Nottingham's School of Chemistry used advanced transmission electron microscopy (TEM) methods to capture the moment when Kr atoms joined together, one by one, inside a "nano test tube" container with diameter half a million times smaller than ...