In the last week or so I’d been wondering what happened to the space elevators (it’s exactly what it sounds like, an elevator that takes you into space) and then this September 23, 2024 essay by Stephen Lyn (Strathclyde Chancellor’s Fellow, Chemical and Process Engineering, University of Strathclyde) on The Conversation popped up, Note: Links have been removed,
Graphene at 20: still no sign of the promised space elevator, but here’s how this wonder material is quietly changing the world
Twenty years ago [2004] this October , two physicists at the University of Manchester, Andre Geim and Konstantin Novoselov, published a groundbreaking paper on the “electric field effect in atomically thin carbon films”. Their work described the extraordinary electronic properties of graphene, a crystalline form of carbon equivalent to a single layer of graphite, just one atom thick.
Around that time, I started my doctorate at the University of Surrey. Our team specialised in the electronic properties of carbon. Carbon nanotubes were the latest craze, which I was happily following. One day, my professor encouraged a group of us to travel to London to attend a talk by a well-known science communicator from the University of Manchester. This was Andre Geim.
We were not disappointed. He was inspiring for us fresh-faced PhD students, incorporating talk of wacky Friday afternoon experiments with levitating frogs, before getting on to atomically thin carbon. All the same, we were sceptical about this carbon concept. We couldn’t quite believe that a material effectively obtained from pencil lead with sticky tape was really what it claimed to be. But we were wrong.
The work was quickly copied and reproduced by scientists across the globe. New methods for making this material were devised. Incredible claims about its properties made it sound like something out of a Stan Lee comic. Stronger than steel, highly flexible, super-slippery and impermeable to gases. A better electronic conductor than copper and a better thermal conductor than diamond, as well as practically invisible and displaying a host of exotic quantum properties.
Graphene was hailed as a revolutionary material, promising ultra-fast electronics, supercomputers and super-strong materials. More fantastical claims have included space elevators, solar sails, artificial retinas, even invisibility cloaks. [emphasis mine]
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Lyn takes us back to earth, from the September 23, 2024 essay,
In terms of public perception, it’s fair to say that graphene has been held to an impossible standard. The popular media can certainly exaggerate science stories for clicks, but academics – including myself – are not immune from over-egging or speculating about their pet projects either. I’d argue this can even be useful, helping to drive new technologies forward. Equally, though, there can be a backlash when progress looks disappointing.
Having said that, disruptive technologies such as cars, television or plastic all required decades of development. Graphene is still a newcomer in the grand scheme of things, so it’s far too early to reach any conclusions about its impact.
Lyn goes on to point out where graphene has made inroads, from the September 23, 2024 essay, Note: Links have been removed
What has quietly occurred is a steady integration of graphene into numerous practical applications. Much of this is thanks to the Graphene Flagship, a major European research initiative coordinated by Chalmers University of Technology in Sweden. This aims to bring graphene and related materials from academic research to real-world commercial applications, and more than 90 products have been developed over the past decade as a result.
These include blended plastics for high-performance sports equipment, more durable racing tyres for bicycles, motorcycle helmets that better distribute impact forces, thermally conductive coatings for motorcycle components, and lubricants for reducing friction and wear between mechanical parts.
Graphene is finding its way into batteries and supercapacitors, enabling faster charging times and longer life spans. Conductive graphene inks are now used to manufacture sensors, wireless tracking tags, heating elements, and electromagnetic shielding for protecting sensitive electronics. Graphene is even used in headphones to improve the sound quality, and as a more efficient means of transmitting heat in air-conditioning units.
Graphene oxide products are being used for desalination, wastewater treatment and purification of drinking water. Meanwhile, a range of graphene materials can be bought off the shelf for use in countless other products, and major corporations including SpaceX, Tesla, Panasonic, Samsung, Sony and Apple are all rumoured or known to be using them to develop new products.
I am thankful for Lyn’s September 23, 2024 essay, which answers my question about space elevators and offers a good update on graphene’s integration and impact on society. If you have an interest in hearing the Sir Andre Geim talk “Random Walk to Graphene,” Lyn has embedded the almost 38 minutes talk in his essay. Finally, h/t to phys.org’s Sept. 23, 2024 news item.