Oldest known human-made nanostructures dated to 600 BC discovered in Tamil Nadu

Scientists have discovered the oldest known human-made nanomaterials in the "unique black coatings" of ancient pottery shards -- dated to 600 BC -- unearthed from an archeological site in Keeladi, Tamil Nadu. The research, published recently in the journal Scientific Reports, revealed that these coatings are made of carbon nanotubes (CNTs) which have enabled the layer to last more than 2600 years, raising questions on the tools used during those periods to achieve high temperatures for making earthenwares.

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