Diamagnetic Levitation with Pyrolytic Graphite - $20 How-To
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- Опубликовано: 25 июн 2014
- A simple demonstration showing how arrange small, inexpensive neodymium magnets for the diamagnetic levitation of pyrolytic graphite. Materials used were less than $20 USD, shipped.
Shot with a Sony α65 and SAL1650 lens. I should probably stop down a bit from f/2.8 next time... depth of field is a bit narrow. :)
by Kevin H. Patterson 
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Helped me a lot for the exam.... thanks!!!!
Wow, this means you could build a track for it to follow. It will stay in any groove you have on the magnets surface. I don't think there can be any horizontal junctions, as that should stop it dead in its tracks. Just two, long strips of magnets, and a laser beam for forward momentum. I can only imagine how challenging it would be to make it turn corners. Unless the laser has enough power to drive it through horizontal junctions?
+dieselphiend Yes I believe this is possible, and I think you can find some videos on RUclips showing Halbach array tracks. However, I doubt you could propel it with a "normal" power laser beam, as the friction of the air would still dominate.
I did this many many years ago and you can use a larger square the corners of mine nearly reached the edge of the magnets and it floats higher too! BUT I did have the cubes and 0.5" and also used about 1/8 inch spacers in between the cubes.
As far as turning corners, you could build a circular track in the shape of the inside of a torus (donut). At low speeds, the graphite would float above the bottom of the track, and as the velocity increases it will "ride up" the outside of the track due to centrifugal force. Would be very cool to see in action. It would have to be pretty large area compared to the size of the magnets, unless you could get custom shaped magnets...
Bismuth is the most diamagnetic of all metals, but it still more weakly diamagnetic than pyrolytic graphite. It is also quite a bit denser. So, a piece of bismuth of the same thickness would levitate much less, if at all, due to it's much higher weight. I have another apparatus that levitates a small magnet between chunks of bismuth, but it requires a large upper magnet, carefully adjusted to cancel the force of gravity. The weak diamagnetic effects of the chunks of bismuth merely help to "stabilize" the small magnet in this zone.
If you fixed a sheet of graphite to a table, could the neodymium magnets levitate?
Very nice
Kool. & technically u can do that with a slim wafer of bismuth metal Between 2 powerful neodymium magnets. & conversely a neodymium magnet between 2 thick slabs of bismuth metal slabs.
Werkt goed perfect.
What strength are those magnets? If the magnets were stronger can I assume the float height would be higher? Interesting video. Thanks
An insomniac’s dream video.
Have ever tried dipping the graphite in liquid nitrogen? Just wondering if it has similar properties as superconductors i.e. will it get locked in a fixed position via quantum tubes?
Good question. I've not heard about graphite as a superconductor, but carbon nanotubes can be, so there may be some effect. Unfortunately I don't have access to any liquid nitrogen (or liquid helium!) to try it... :(
Does pyrolytic graphite expel magnetic fields at its surface, as if it superconducts in a thin layer? Is it actually superconducting at the surface, or in a layer just below the surface? I mean, it must have perfect eddy currents somewhere to do that, but since you need a very thin piece, it can't be throughout the bulk, and I suppose, since people don't say it's a superconductor, that it doesn't carry a current at or through its surface.
Does pyrolytic graphite transmit an electrical signal well and what impedance can be deduced?
Is that tin what I think it is?
What is happening atomically? How does the Magnetic field of the graphite look? i don't understand why both poles repeal graphite. As I was taught graphite has layers of free elections that hold the layers of atoms in place, however this is kinda like a lubricant, hence graphite is used in pencils and can be used to pass electricity through it..
The theory is a bit dense, but essentially, the object falling toward the magnet creates a changing magnetic field in the object, which affects electron orbitals, inducing a corresponding current in them, which repels the external magnetic field. en.wikipedia.org/wiki/Diamagnetism#Theory
Are there critical temperatures, magnetic field strengths, currents, and voltages that will prevent this diamagnetism?
awesome..
thanks!
Does it have greater diamagnetic properties than bismuth?
🤔
Behold! The 10 minute, 2 minute video!
Lance Roark g
courtesy of overwrought productions
Behold the moaning comment without a helpfull timestamp
@@shaunlastname391 damn
@@lanceroark6386 😂
Aqui no meu País o nome disso é: "Encher linguiça". Deu pra entender ?
This is stronger than bismuth?
If you sprinkle fine graphite dust over it do you get a specific pattern or design?
Interesting question. I don't have any graphite dust handy, but I would imagine that it would collect at the null points of magnetic flux (where the corners of the magnets come together), and avoid the center of each magnet's face.
Bismuth is the most diamagnetic of all metals, but it still more weakly diamagnetic than pyrolytic graphite. It is also quite a bit denser. So, a piece of bismuth of the same thickness would levitate much less, if at all, due to it's much higher weight. I have another apparatus that levitates a small magnet between chunks of bismuth, but it requires a large upper magnet, carefully adjusted to cancel the force of gravity. The weak diamagnetic effects of the chunks of bismuth merely help to "stabilize" the small magnet in this zone.
Kevin Patterson what if you draw with a pencil on a tiny paper square on both sides and see if it floats. 🤔✏️
Good demo. I am thinking that if could have a stronger magnet assembly and say mount it in a shock assembly or something like that on a car, you'd be able to make the weight of the car less. Would use less energy on fuel and probably make a more comfortable ride.
The diamagnetic fields of these types of materials are so weak that I doubt it could be useful for suspending the weight of a car. Using a _much_ more powerful magnet beneath would also have the effect of magnetically attracting the steel of the car (pulling it down). Also, you should realize that these "floating" diamagnetic objects don't _weigh less_. They weigh the same as if they were not floating; the magnetic field "holds them up". In other words, if my magnets weigh 10g and my graphite weighs 1g, if I put the magnets on a scale and float the graphite above them, the scale will read 11g. So your car wouldn't weigh any less. The magnetic field is like an invisible spring, a lot like the regular springs in a car's suspension.
Good points. I tend to think eventually someone will figure out a way to do the anti-gravity or anti-grav support mechanisms. Vehicles will need to be of a non-magnetic metal or composite.
I'm not aware of any current or proposed technology that can actually manipulate gravity (other than moving large amounts of mass around, lol), but if anyone ever discovers a way, it will definitely be a total game-changer. NASA is supposedly experimenting with RF resonant cavity thrusters ("EmDrive"), which theoretically could be used to provide hovering thrust even on Earth's surface (not actually reducing the mass or gravitational pull on the vehicle, though). The Alcubierre drive is a proposed type of "warp" drive for theoretical faster-than-light travel, which might be possibly used for gravitational side-effects...
@@kevpatt you could use the dirigible technologies for that but you might have to ask the USA to undo the 1937 helium control act so you can actually use it
for every action a reaction if a magnet push its pushes if it pulls it pulls but it cant make it disappear you can take the contact out of a bearing though
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Wow one day i want to build a floating park
Why aren't we making train rails and cars to go over them using this???
Omg dude why such a longggg drawn out video for just graphite on a magnet
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