Carbyne will be the strongest of a new class of microscopic materials if and when anyone can make it in bulk.
If they do, they’ll find carbyne nanorods or nanoropes have a host of remarkable and useful properties, as described in a new paper by Rice University theoretical physicist Boris Yakobson and his group. The paper appears this week in the American Chemical Society journal ACS Nano.
Carbyne is a chain of carbon atoms held together by either double or alternating single and triple atomic bonds. That makes it a true one-dimensional material, unlike atom-thin sheets of graphene that have a top and a bottom or hollow nanotubes that have an inside and outside.
According to the portrait drawn from calculations by Yakobson and his group:
* Carbyne’s tensile strength – the ability to withstand stretching – surpasses “that of any other known material” and is double that of graphene. (Scientists had already calculated it would take an elephant on a pencil to break through a sheet of graphene.)
* It has twice the tensile stiffness of graphene and carbon nanotubes and nearly three times that of diamond.
* Stretching carbyne as little as 10 percent alters its electronic band gap significantly.
* If outfitted with molecular handles at the ends, it can also be twisted to alter its band gap. With a 90-degree end-to-end rotation, it becomes a magnetic semiconductor.
* Carbyne chains can take on side molecules that may make the chains suitable for energy storage.
* The material is stable at room temperature, largely resisting crosslinks with nearby chains.
That’s a remarkable set of qualities for a simple string of carbon atoms, Yakobson said.
“You could look at it as an ultimately thin graphene ribbon, reduced to just one atom, or an ultimately thin nanotube,” he said. It could be useful for nanomechanical systems, in spintronic devices, as sensors, as strong and light materials for mechanical applications or for energy storage.
“Regardless of the applications,” he said, “academically, it’s very exciting to know the strongest possible assembly of atoms.”
Based on the calculations, he said carbyne might be the highest energy state for stable carbon. “People usually look for what is called the ‘ground state,’ the lowest possible energy configuration for atoms,” Yakobson said. “For carbon, that would be graphite, followed by diamond, then nanotubes, then fullerenes. But nobody asks about the highest energy configuration. We think this may be it, a stable structure at the highest energy possible.”
Theories about carbyne first appeared in the 19th century, and an approximation of the material was first synthesized in the USSR in 1960. Carbyne has since been seen in compressed graphite, has been detected in interstellar dust and has been created in small quantities by experimentalists.
“I have always been interested in the stability of ultimately thin wires of anything and how thin a rod you could make from a given chemical,” Yakobson said. “We had a paper 10 years ago about silicon in which we explored what happens to silicon nanowire as it gets thinner. To me, this was just a part of the same question.”
The Rice researchers, led by Rice graduate student Mingjie Liu and postdoctoral researcher Vasilii Artyukhov, were aware of a number of papers that described one property or another of carbyne. They set out to detail carbyne with computer models using first-principle rules to determine the energetic interactions of atoms, Artyukhov said.
“Our intention was to put it all together, to construct a complete mechanical picture of carbyne as a material,” Artyukhov said. “The fact that it has been observed tells us it’s stable under tension, at least, because otherwise it would just fall apart.”
Yakobson said the researchers were surprised to find that the band gap in carbyne was so sensitive to twisting. “It will be useful as a sensor for torsion or magnetic fields, if you can find a way to attach it to something that will make it twist,” he said. “We didn’t look for this, specifically; it came up as a side product.”
“That’s the good thing about studying things carefully,” Artyukhov said.
Another finding of great interest was the energy barrier that keeps atoms on adjacent carbyne chains from collapsing into each other. “When you’re talking about theoretical material, you always need to be careful to see if it will react with itself,” Artyukhov said. “This has never really been investigated for carbyne.”
The literature seemed to indicate carbyne “was not stable and would form graphite or soot,” he said.
Instead, the researchers found carbon atoms on separate strings might overcome the barrier in one spot, but the rods’ stiffness would prevent them from coming together in a second location, at least at room temperature. “They would look like butterfly wings,” Artyukhov said.
“Bundles might stick to each other, but they wouldn’t collapse completely,” Yakobson added. “That could make for a highly porous, random net that may be good for adsorption.” Artyukhov said the nominal specific area of carbyne is about five times that of graphene.
Go deeper with Bing News on:
- Ehud Barak’s complicated position in Israeli politics and industry
Two stories have come out that placed the left’s anti-government riots in a new light.The post Ehud Barak’s complicated position in Israeli politics and industry appeared first on JNS.org.
- Amul shares clarification post about viral fungus-filled lassi, calls it fake
In the Twitter post, Amul shared a snapshot of the lassi packet and assured the consumers that no such incident has been reported.
- Public Safety And Security Market Expands Significantly | Reaching USD 832.1 Billion By 2031
Public Safety and Security Market Value Growing threat landscape across the globe and rapid urbanization & emergence of smart city initia ...
- New Orleans 911 center launches live audio language translation for non-English speaking callers
NEW ORLEANS (WVUE) - Emergency communication specialists at the Orleans Parish Communication District now have access to live translations on their screens when a non-English speaking person needs ...
- Carbyne Inc
A special interest's lobbying activity may go up or down over time, depending on how much attention the federal government is giving their issues. Particularly active clients often retain multiple ...
Go deeper with Google Headlines on:
[google_news title=”” keyword=”Carbyne” num_posts=”5″ blurb_length=”0″ show_thumb=”left”]
Go deeper with Bing News on:
- The 12 Best POS Systems for Small Businesses: Our Top Picks for 2023
A POS system allows you to accept customer payments, track your sales, and manage your small business. See our picks for the best POS systems in 2023. A POS system, or point-of-sale system ...
- Novel Wiener Path Integral Technique Enables Accurate Modeling of Micromechanical Oscillators
Nanowires and their arrays are becoming increasingly important as structural building blocks in the future of nanotechnology. Their potential ...
- Best Medical Alert Systems Of 2023
How Much Do Medical Alert Systems Cost? Monitoring services for a medical alert system can cost as low as $14.95 per month and as much as $61.95 per month. These prices don’t necessarily include ...
- System Shock
The System Shock Remake brings back the original game's forward-thinking difficulty system, that lets you create a personal tailor made experience. System Shock is the faithful remake of the ...
- Best DIY Home Security Systems of 2023
These days, there are plenty of do-it-yourself options that are easy to install and can keep your home safe without all of the expenses and contracts that come with a professional security system.
Go deeper with Google Headlines on:
[google_news title=”” keyword=”nanomechanical systems” num_posts=”5″ blurb_length=”0″ show_thumb=”left”]