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Levitating Graphene Is Fastest-Spinning Object
techbeat writes "A flake of exotic carbon a few atoms thick has claimed a record: the speck has been spun faster than any other object, at a clip of 60 million rotations per minute. Previously, micrometre-sized crystals have been spun at up to 30,000 rpm using an optical trap. It is thanks to graphene's amazing strength that the flakes are not pulled apart by the much higher spinning rate, says Bruce Kane at the University of Maryland in College Park. Spinning could be a way to probe the properties of graphene, or manipulate it in new ways."
can you give it enough mass to make it into a decent flywheel?
... of trying to teach the GF to drive a stickshift back in high school. Went through a few clutches back then.
Have gnu, will travel.
Could this material be used to make HYPER MEGA TERRIBLY ASTRO FAST harddisks?
... in Dradle technology.
Summary fscked up. 30 000RPM isn't exactly much at all.
Ie. almost all RC (radio controlled) model brushless motors can do 30k RPM, and some brushed motors can do that as well...
Nevermind so many other things which do spin reaaally fast ...
Pulsed Media Seedboxes
They make 20k rpm hard drives. I'll bet that is a typo for 30k rpm. I'll bet it should be 30M rpm.
No wait, even if we have a video that ran at one million frames per second all we would see is an immobile object. At two million frames per second we would see it move instantly by 180 degrees...
How did they calculate that 60 million rotations per minute again?
So that's what a Warlock's Wheel has to be made of...
...and I say it has to spin!
politicians can't wait for this technology to become usable.
60,000,000 RPM is (approximately) 1,000 per millisecond.
No thanks necessary, you're welcome.
Seriously, we could do this all day :)
Summation 2
...when I watched an idiot EN3 (Petty officer 3rd class) walking on a prop shaft cover (which he knew he wasn't supposed to do) while we were under way and slipping and engaging the tiny tiny tiny tiny little gear that was intended to turn the shaft in port to avoid warping. I don't remember the ratio of the gear but it was something on the order of a few hundred thousand to one (it turned the shaft once every 90 minutes or something) and when this dipstick engaged it (someone was doing maintenance on it so it was unlocked) the shaft was doing 150 rpm or so. I remember doing the math at the time and figuring out the max RPM on the gear was somewhere along the lines of 35 million plus rpm. Now, the gear didn't make it that high since it disintegrating with what sounded like a bomb going off. Thank God it was small as it blew holes through bulkheads, steel covers, blew the cover off the rocker arms on the diesel engine 20 feet away. Nobody was hurt except for some ringing ears. Ahh, those 3 years in the Navy before I go to university, what things we learned... Hehe. BTW, the 'instant petty officer' was upside down in the reduction gear lube sump the minute we got back into port as punishment (the cheng [chief engineer] had him practicing his needle-gunning skills in the bilge two hours every morning in the meantime.)
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I wonder how fast you could spin a nitrogen molecule before it falls apart? It should be calculable. Would hydrogen go even faster?
a,e,i,o,u and sometimes w and y (at be if of up cwm by)
In Romania they have a saying: Go spinning around.
It roughly means go f*** yourself.
The speed makes me think of what would happen to a rotating sphere that spins so fast the outer portions become relativistic and undergo both spatial and temporal changes relative to the inner core.
A 10-km diameter neutron star rotating in a millisecond is moving 30,000 km per second at the surface. That is tenth light speed and relativistic effects must be considered. "Neutron star" is just a name. The actual composition may be a quark soup, i.e single mega-nucleus. The attractive strong-nuclear & gravitational forces versus the repulsive centripedal and electrostatic forces are near unimaginable.
Finally a material strong enough to build the ultimate Tilt-aWhirl
As noted by another poster, 30000rpm isn't a record. In my field of solid-state nuclear magnetic resonance, magic-angle spinning rotors can achieve 70kHz--or 4.2M rpm. Samples of 1-30mg of microcrystalline protein (or other sample) are spun in rotors of microliter volume using dry air : bearing gas to create a bed of air for the rotor, and a drive gas to propel the rotor. Spinning the sample suppresses anisotropic magnetic fields in the sample and simulate solution-like conditions.
Would it be simpler to use a sheet of graphene to build a space elevator rather than carbon nanotubes? It certainly seems to have the tensile strength for it...
You'll need some sort of robotic politician from the future to pull that off.
Oh SHI-
I can't wait for my new 60 million rpm hard drive! No I didn't RTFA, this is /. That said, I suspect translating this to an applied take a smidge longer than my life span.
My understanding is that it is graphite if there's more than one layer and it is only graphene when it is a single layer, which by definition is also a monatomic layer. If this is correct, then you cannot have graphene a few atoms thick. That has no meaning.
It's a small world and it smells funny; I'd buy another if it wasn't for the money; Take back what I paid (SoM)
at a cool million rotations per second, and given the friction coefficient of human skin is about 0.8, I'd say that you have no crotch left.
You can't handle the truth.
It sounds slow, but what you don't realise is that they're scaling down that hard drive in realtime.
Ah, but what if his crotch is made of graphene?
was really helpful - I'd always wondered what "circular polarization" meant.
No folly is more costly than the folly of intolerant idealism. - Winston Churchill
wouldn't work unless .... it was an oscillating electric field TRAP!
You can't handle the truth.
"spun at up to 30,000 rpm" ?? Am I missing something here? 30,000 rpm is achievable with a common R/C car motor or an aggressive electric toothbrush... I assume that's a typo.
"As a result, the flakes started spinning at 60 million rotations per minute, faster than any other macroscopic object."
"Previously, micrometre-sized crystals have been spun at up to 30,000 rpm"
Following through to the source of that quote:
"Their short axis follows the direction of the linear polarization of the beam. In circular or elliptic polarization, the crystals are spontaneously put in rotation with a high speed of up to 500 turns per second. It is the first time, to the best of our knowledge, that such a result is reported for particles of the size of our crystals."
So, if the 30,000 RPM crystal is interesting because it was a crystal, or because it was small, fine. But if they're saying that 30,000 RPM was interesting for large objects, ummm, turbocharger turbines spin at up to 150,000 RPM.
That said; 60 million RPM is very impressive.
Stop-Prism.org: Opt Out of Surveillance
So basically, what you're saying is that your 'mom' is a trap?
no, I don't believe that's the logical conclusion of this thread, but it may be that you are the original AC...
You can't handle the truth.
The wiki reference mentions stars 12KM in diameter and "several hundred times a second". You mentioned almost 900 times a section. I'd consider one percent light speed to be highly relativistic. Some of these numbers are as much as ten percent.
60,000,000, because after the first minute, it stops.
SIG FAULT: Post index out of bounds.
I have a Dyson vacuum cleaner with a motor that spins 3 times faster than that. WTF?
I don't need no estinkin'
Jeepmeister
Sorry I can't find the source... but someone commented humorously that "Hertz has a unit named after them, why doesn't Avis?" Avis was semi-sarcastically named as a unit of angular velocity; 1 Avis is 2*pi radians of rotation per second, or 1 full rotation per second.
So this is 1 million Avis.
std commercial ultracentrifuges, used in the life sciences, spin at 80 to 100 K, and the objects they rotate ("rotors" in the argot)are titanium cylinders or frustrated cones that weigh several kilos. Centrifgues that went up to 50K were available in the 1970s, if not earlier; one limit was the strenght of hte "rotor", which were made of aluminum at the time; now they are made of Ti and carbon fiber. As you can imagine, the manufacturers are carefull to stress safety; one thing that distinguishes a Beckman L50, which has a max speed of 50K, and a 90K instrument is the rating for the armor plate that surrounds the spinning object; basically, if a multi Kilo piece of metal rotating at 90K comes loose, the armor has to be able to prevent any projectile formation PS: you know when it happens, cause you get a loud noise https://www.beckmancoulter.com/eCatalog/CatalogItemDetails.do?productId=12210 (http://www.beckmancoulter.com/literature/Bioresearch/BR-9272A.pdf ) http://golgi.harvard.edu/Gaudet/Resources_Files/Beckman/PrepRT.pdf
Its University of Maryland, College Park
It is the University of Maryland
UMBC, UMES, and UMUC may share the 'University of Maryland' name, but are in no way related beyond the fact their state owned.
All your 09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0 are belong to us
Is it true that relativity predicts that rotating an object increases its mass? Does this graphene apparatus offer a way to test that theory, as the starting mass is small enough to detect small increases as large relative to the starting mass, and the rotation can be high enough frequency to really see the effects of the phenomenon?
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make install -not war
I'll try spinning. That's a neat trick.
I'm Abram Bender. You're not.
WolframAlpha needs to be updated now. Did a search on 60 million rotations per minute to find out the period (1×10^-6 seconds), and I noticed this bit of info: ~~ 3 × fastest induced angular velocity (steel ball 0.8 mm diameter suspended in vacuum) (~~ 2×10^7 rpm )
60 million rotations per minute - Wolfram|Alpha
also, it would have to be microscopic..... oh wait....
Found. http://en.wikipedia.org/wiki/Governor_of_California
Oh, I'm sorry sir, I thought you were referring to me, Mr. Wensleydale.