Scientists Succeed At (Cryogenically Enhanced Magneto-Archimedes) Levitation
Scientists at the University of Nottingham have succeeded in levitating some of the heaviest elements in nature, including lead and platinum. Their techique involved immersing objects in both liquid oxygen and a strong magnetic field.
(From Cryogenically Enhanced Magneto-Archimedes Levitation pdf)
Objects shown floating are (top to bottom) a silicon crystal, a gallium arsenide crystal, a British 5 pence coin, a lead musket ball, and a gold sovereign coin. The materials are separated due to differences in their density, and float
at vertical positions where the total Archimedean and magnetic buoyancy is equal to their weight. The experiments were performed using an Oxford Instruments superconducting magnet with closed-cycle cooling, a system specifically designed for experiments on levitation. The magnet has a 50mm diameter open bore and is capable of producing a maximum central field of 17 Tesla.
Diamagnetism occurs as a result of a magnetic field's interference with the motion of electrons orbiting the atoms or molecules of a material. When matter is placed in a magnetic field, the magnetic force acts upon the moving electrons in the matter, causing the electrons to be deflected. This movement of the electrons interferes with the motion of the magnetic field, so the atoms internally oppose the field. This causes the material to be slightly repelled by the magnetic field.
All materials demonstrate some degree of diamagnetism. Magnetic levitation occurs when the force on such an object is strong enough to balance the weight of the object itself. The technique of immersing an object in a liquid to enhance the diamagnetic effect is called "magneto-Archimedes" levitation, due to the buoyancy provided by the liquid.
Diamagnetism has been known since the early 19th century; the first experimental confirmation of diamagnetic levitation was done with bismuth in 1939. The technique also works with living creatures; a living frog was successfully levitated when placed in the bore of a Bitter solenoid with a field strength of about 16 Tesla (the magnetic field strength of the Earth varies from about .3 to .6 gauss at sea level; one Tesla equals 10,000 gauss).
Science fiction writers can't be expected to stay away from something as cool as levitation that really works. Isaac Asimov found a use for diamagnetic levitation in his 1962 story The Currents Of Space:
The ship rolled out of the hangar like an air-borne whale, moving slowly, its diamagnetized hull clearing the smooth-packed clay of the field by three inches. The ship came to a halt, pinpointed at the lip of a take-off pit. The diamagnetic field strengthened progressively towards the ship's prow and it began tipping upward. Terens was mercifully unaware of this as the pilot room turned on its universal gimbals to meet the shifting gravity. Majestically, the ship's rear flanges fitted into the appropriate grooves of the pit. It stood upright, pointing to the sky.
(Read more about diamagnetic levitation)
The lead investigators on this project, Professors Laurence Eaves and Peter King are sure that this technique will lead to many practical applications. Professor King said: "You can use this technology to accurately sort minerals. Under vibration you throw crushed ore into the air and in the magnet the different components experience different effective gravity. They therefore tend to land at different times and after a short while the vibration sorts them into bands according to their density. The method can discriminate between components with very small differences in density enabling you to extract the precious parts you require."
Read more at Scientists Levitate diamond, lead and platinum, check out diamagnetic levitation photos and videos and read their scientific paper
here. Thanks to Winchell Chung for supplying the tip and the quote.
Scroll down for more stories in the same category. (Story submitted 5/12/2005)
Follow this kind of news @Technovelgy.
| Email | RSS | Blog It | Stumble | del.icio.us | Digg | Reddit |
you like to contribute a story tip?
Get the URL of the story, and the related sf author, and add
Comment/Join discussion ( 4 )
Related News Stories -
Metalenses Now Reconfigurable With Liquid Crystal
'Hufhuf oil held in static tension...' - Frank Herbert, 1965.
NDB Nuclear Waste Battery Lasts A Lifetime
'Trillions of units of power could be compressed thus into an inch-square cube of what looked like blue-white ice.' - Edmond Hamilton, 1940.
Blaux Your Personal Commuter Cooling Unit
A cooling unit had to be strapped to every commuter's back, by law.
SunnyFive 'Window' Has Full Spectrum Angled Natural Light
'On the ceilings are screens.' - Stanislaw Lem, 1961.
Technovelgy (that's tech-novel-gee!)
is devoted to the creative science inventions and ideas of sf authors. Look for
the Invention Category that interests
you, the Glossary, the Invention
Timeline, or see what's New.
OK, NASA 3D Printer Of Food Not Yet Star Trek Food Synthesizer
Maybe not, but we're seeing definite progress.
Kelly Clarkson Show Like Black Mirror '15 Million Merits'
'These people are pieces of software called avatars.'
Salto Jumping Robot Now Sticks Landing!
'Lucky touched the leap knob and the hopper's leg retracted.'
Gyroscopic Median-Straddling Mass Transit Vehicles
'It was among these leviathans that the little gyrocar was daring to thrust its puny self...'
Bigrating Laser Beam-Riding Light Sail Is Self-Correcting
'That sail will be twenty thousand miles at the wide part.'
ISS Astronauts Test Estee Lauder 'Advanced Night Repair' Skin Serum
'Out in the New Moon, just ask for what you want...'
LG Wing Twisting Smartphone Might Be Fun
'A polycarbon screen unfurled...'
Mushroom Coffin Returns You To Nature, Naturally
'She touched the leaf. She was wanted.'
Will ATT Offer Ad-Subsidized Cellphone Service
'For long-distance calls the ratio of commercial to conversation was as high as 10 to 1...'
Gyro-X Self-Balancing Two-Wheeler Car
'Indeed, the gyrocar was a sight to make a man look twice.'
Beat Covid-19 With AIR By MicroClimate - At Last I Get My PAPR
More than just a bubble.
Mi TV LUX Transparent Edition OLED TV
The Look of Things To Come.
Metalenses Now Reconfigurable With Liquid Crystal
'Hufhuf oil held in static tension...'
'Alexa For Residential' A Landlord's Dream (Tenant's Nightmare?)
'...unseen mechanical entities... that are in our very midst. One of them following each of us.'
Gather Ye Moonrocks While Ye May
'The law of filing on newly discovered asteroids was definite.'
InMotion V11 Electric Unicycle Gets Air (Video)
'A tumblebug does not give a man dignity...'
More SF in the News Stories
More Beyond Technovelgy science news stories