In search of purity: As technologies requiring the use of carbon nanotubes become more refined, the purity of the nanotubes becomes an ever‐increasingly important factor. This Highlight not only takes a look at some attempts to improve the purity of single‐walled carbon nanotubes (SWNTs) but also puts forward some new procedures to enhance their purity (the image shows SWNTs before (left) and after (right) one of the procedures described).
A set of empirical potentials based upon two and three body interactions were constructed for the Li + -C system and structural optimizations for various assemblages containing Li + ions and graphene sheets were conducted using some emerging evolutionary and genetic algorithms, differential evolution, and particle swarm optimization in particular. Some limited molecular dynamics calculations were also performed. The results are discussed and analyzed with reference to the lithium ion batteries, where the graphite-Li + assemblages traditionally constitute the negative electrode, for which the present results are highly pertinent.
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