“They do not look like normal pots, these have glazed finishes, and are made of high-quality clay,” Mr. The fine black and red effect was achieved by high temperature firing temperatures at about 1100 degrees in the presence of carbon-rich matter and iron-rich red soils,” Ms. “Black and red pottery ware associated with megalithic sites in southern India continues into Keeladi dated back to 6th century BCE. Chandrasekaran said the ancient Tamil civilisation of this time were aware of, and mastered high-temperature processing, but added that the means and mechanism by which they produced these artifacts with carbon-nanotubes is not widely explored. Srinivasan toldīased on their analysis, Mr. “But it is increasingly recognised from archaeological studies that past skilled artisans sometimes accidentally or empirically made nanomaterials - such as the famous Egyptian Blue - without being aware of the science of working at the nano-scale,” Ms. Rajavelu added.Ĭommenting on the significance of the research, Sharada Srinivasan, an expert in archaemetallurgy associated with the National Institute of Advanced Studies (NIAS) in Bengaluru, said nanotechnology has made strides since the 90s with the advent of advanced techniques like the scanning tunnelling microscopy. “They likely knew the technique to make these coatings practically, but may not have known this as a thesis with any kinds of formulae,” Mr. He said the ancient people would not have known these as CNTs, but may have just had the need to make their pots have high durability, “and may have needed a certain colour out of their products on applying high-temperature firing”. So these structures are already even present in nature and only now we are observing them,” explained Mr. “Normally with high-temperature processing of carbon, they form these type of tubular nano-structures, but until about the 1990s there were no sophisticated instruments available to characterise them. “This fire treatment may have led to the formation of the coating which has likely strengthened the pot and made the coating durable,” Mr. PTI that the people of this time may have added or coated something similar to plant-sap to the inside of the pots, and subject it to the nearly 1100-1400 degree Celsius high-temperature fire treatment as seen in kilns. Rajavelu S., Professor of History at Alagappa University in Tamil Nadu, who was unrelated to the study, told ![]() Chandrasekaran, the closest scientific explanation for the finding is that some “vegetal fluid or extract” might have been used in the coatings of these pots which may have led to the formation of CNTs during high-temperature processing. “If there is some processing of the potteries, which probably would have involved some high-temperature treatment, then it will add more justification to the findings,” he added.Īccording to Mr. ![]() “But the people of this time may not have intentionally added CNTs, instead, during the processing at high temperatures, these would have just formed accidentally,” Mr. Shaijumon from IISER Thiruvananthapuram, who was unrelated to the study. ![]() “But the robust mechanical properties of the CNT based coating has helped the layer sustain more than 2600 years,” he added.Ĭarbon nanotubes have superlative properties, including high thermal and electrical conductivity, and very high mechanical strength, explained nanomaterial scientist M. ![]() “Until this discovery, to our knowledge, the most ancient known nanostructures in human-made artifacts are from the eighth or ninth century AD,” study co-author Vijayanand Chandrasekaran from VIT toldĬNTs are tubular structures of carbon atoms arranged in an ordered manner, Chandrasekaran said, adding that coatings in ancient artifacts may not usually last this long due to wear and tear caused by changing conditions. Scientific Reports, revealed that these coatings are made of carbon nanotubes (CNTs) which have enabled the layer to last more than 2,600 years, raising questions on the tools used during those periods to achieve high temperatures for making earthenwares.Īccording to the scientists, including those from Vellore Institute of Technology (VIT) in Tamil Nadu, the coatings are “the oldest nanostructures observed till now”. The research, published recently in the journal 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.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |