Knots have been around for thousands of years. But now, a team of researchers from the University of Manchester has added a new twist to one of the most basic technologies known to humans.<\/p>\n
Using cutting-edge chemical techniques, the researchers have created the tightest knot ever made, woven on a molecular level. The new knot is a circular triple helix only 20 nanometers long, containing only 192 atoms, the researchers report in a paper published in the Jan. 13 issue of Science magazine.<\/p>\n
While scientists have known for decades that molecular knots like this one are theoretically possible, it has proven difficult to create knots of such complexity, with previous molecular knots using only two strands woven together in very basic patterns. This is the first molecule to incorporate three strands into its structure, in a leap forward for a technology that the researchers suggest could eventually lead to a new generation of super-light and super-strong knotted materials.<\/p>\n
Until now, there had only been three molecular knots created by scientists at this scale: the trefoil, the figure-eight, and the pentafoil, a paltry amount compared to the 6 billion known prime knot formations, Science\u2019s Jessica Boddy explains in a brief. But this new circular triple helix is the most complex knot ever created on this scale, with a total of 8 strand crossings, with each crossing only 24 atoms apart.<\/p>\n
\u201cThat\u2019s very, very tight indeed,\u201d David Leigh, a professor of chemistry at the University of Manchester and study leader, told The Guardian. \u201cIt is definitely the most tightly knotted physical structure known.\u201d<\/p>\n
The entire structure is about 200,000 times thinner than a human hair and requires much more chemical finesse to weave than a macro-scale knot.<\/p>\n
\u201cThese strands we are knotting are so small that you can\u2019t grab the ends and tie them like you would a shoelace,\u201d Dr. Leigh told The Guardian. \u201cInstead we use a chemical process called self assembly, where we mix the organic building blocks with ions that the building blocks then wrap around to make crossing points in the right places.\u201d<\/p>\n
In order to create the new knot, the team first created a solution of strands of carbon, nitrogen, and oxygen atoms, according to the Guardian. When mixed with chloride and iron ions in a heated solvent, the strands wove themselves together over about 24 hours. Then, the ends of each strand were fused together in a continuous loop, and the ions were washed away, leaving only the knot. X-ray crystallography images confirmed that the knot had formed as the researchers had expected.<\/p>\n
\u201cIt\u2019s fantastic,\u201d Edward Fenlon, a chemist at Pennsylvania\u2019s Franklin & Marshall College, who was not part of the study, told NPR. \u201cIt\u2019s really impressive that they\u2019ve been able to go beyond some of the more simple knots with just three crossings.\u201d<\/p>\n
Leigh hopes that building increasingly complex molecular knots will eventually lead to weaving, which could, in turn, lead to new technologies.<\/p>\n
\u201cBullet-proof vests and body armour are made of kevlar, a plastic that consists of rigid molecular rods aligned in a parallel structure – however, interweaving polymer strands have the potential to create much tougher, lighter and more flexible materials in the same way that weaving threads does in our everyday world,\u201d said Leigh in a statement from Manchester University. \u201cSome polymers, such as spider silk, can be twice as strong as steel so braiding polymer strands may lead to new generations of light, super-strong and flexible materials for fabrication and construction.\u201d<\/p>\n
Of course, there is still a long way to go before this kind of micro-weaving is a reality.<\/p>\n
\u201cHistorically, knotting and weaving have led to all kinds of breakthrough technologies,\u201d Leigh told NPR. \u201cKnots should be just as important at the molecular level, but we can\u2019t exploit that until we learn how to make them, and that\u2019s really what we\u2019re beginning to do.\u201d<\/p>\n
New York Times<\/strong><\/p>\n Picture source: Alamy<\/p>\n Picture used for illustrative purposes alone<\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" Knots have been around for thousands of years. But now, a team of researchers from the University of Manchester has added a new twist to one of the most basic technologies known to humans.<\/p>\n","protected":false},"author":7,"featured_media":2700,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[39],"tags":[],"_links":{"self":[{"href":"https:\/\/kt10.khaleejtimes.ae\/index.php\/wp-json\/wp\/v2\/posts\/2699"}],"collection":[{"href":"https:\/\/kt10.khaleejtimes.ae\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kt10.khaleejtimes.ae\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kt10.khaleejtimes.ae\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/kt10.khaleejtimes.ae\/index.php\/wp-json\/wp\/v2\/comments?post=2699"}],"version-history":[{"count":1,"href":"https:\/\/kt10.khaleejtimes.ae\/index.php\/wp-json\/wp\/v2\/posts\/2699\/revisions"}],"predecessor-version":[{"id":2701,"href":"https:\/\/kt10.khaleejtimes.ae\/index.php\/wp-json\/wp\/v2\/posts\/2699\/revisions\/2701"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/kt10.khaleejtimes.ae\/index.php\/wp-json\/wp\/v2\/media\/2700"}],"wp:attachment":[{"href":"https:\/\/kt10.khaleejtimes.ae\/index.php\/wp-json\/wp\/v2\/media?parent=2699"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kt10.khaleejtimes.ae\/index.php\/wp-json\/wp\/v2\/categories?post=2699"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kt10.khaleejtimes.ae\/index.php\/wp-json\/wp\/v2\/tags?post=2699"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}