Picture of the Week
The kind of matter and energy we can see and touch – whether it is in the form of atoms and molecules, or heat and light, only forms a tiny proportion of the content of the Universe, only about 5%. Over a quarter is dark matter, which is totally invisible but whose gravitational attraction can be detected; while over two thirds is dark energy, a force that pushes the Universe to expand ever faster.
13 May 2013
As well as being pretty, crystals tell us something profound: their shapes reflect the way they are structured on the tiniest of scales. The orderly arrangement of their atoms in a neat lattice scales up to produce crystals’ simple, geometric shapes, making their appearance a peep-hole into the world of atoms and molecules.
Crystals can have extremely simple chemistry: diamond, for instance, is made only of carbon atoms, tightly bound together in a repeating pattern. Others are more complex, including the acetylferrocene crystal pictured here, which is made up of iron, carbon, hydrogen and oxygen. But they all share similar, simple, ordered structures.
This crystal of acetylferrocene was grown as part of an undergraduate course in UCL’s Department of Chemistry. However, it has a number of uses in industry. In particular, it is used as an additive in rocket fuel, as it helps increase the propellant’s rate of burning.
Credit: Andrea Sella (UCL Chemistry)
- This image can be reproduced freely providing the source is credited.
Page last modified on 09 may 13 15:18