Paint containing dangerous amounts of lead is on sale in Cameroon, a study has found. Moreover, the subsidiaries of large multinational companies were among those found to be selling this paint.
When chemists think of the neutral radical ammonium, few think of it as behaving like an alkali metal. However, in many ways, particularly its electronegativity, which can be transferred from compound to compound, it acts like a pseudo-atom akin to sodium, according to computations by a team from the UK and the US.
My full story in Chemsistry World – Ammonium radical is atomic pretender.
I just had an additional email from Maciej who highlights an important point from his study: “Even though ammonium is isoelectronic with sodium, its electronegativity is most similar to potassium, while the ionic radius to rubidium.”
An extract from brown algae – seaweed – could give rechargeable lithium-ion batteries a boost by allowing silicon nanopowder to be used as a high-capacity alternative to graphite electrodes. The potential improvement is almost an order of magnitude boost, the researchers say.
A chemical spider that spins a polymer thread using a simple catalyst could drive a nanomotor, according to researchers at Pennsylvania State University, US. Ayusman Sen and colleagues say that these nanomotors have potential applications in the deposition of polymers within the channels of microdevices for instance.