Naked Science Forum
Non Life Sciences => Chemistry => Topic started by: realmswalker on 18/05/2006 23:48:49
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I am a bit of an amateur at magnetics, but i was wondering, is there any liquid that can be magnetically charged, or at least be affected or contained by magenets
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Don't know about liquid magnets in a literal sense, but you can get suspensions of magnetic particles in oil. These are often used for liquid bearings, where the microscopic magnetic particles suspended in the oil are trapped within a magnetic field, preventing the oil itself from flowing out of the bearing.
George
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hmmm, what stops a powerful magnet from drawing the particles out of suspension?
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I never heard of this before. It would be interesting to see a diagram of this device.
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Sorry, my mistake – they are seals not bearings.
http://en.wikipedia.org/wiki/Ferrofluid
quote:
A ferrofluid is a specific type of liquid which responds to a magnetic field. Ferrofluids are composed of nanoscale magnetic particles suspended in a carrier fluid. The solid particles are generally stabilized with an attached surfactant layer.
Applications
They are used in loudspeakers to sink heat between the voice coil and the magnet assembly, and to passively damp the movement of the cone. They reside in what would normally be the air gap around the voice coil, held in place by the speaker's magnet.
Ferrofluids are similarly used to form liquid seals around the spinning drive shafts in hard disks.
Using electromagnets and sensors, the viscosity of magnetorheological fluids can be controlled dynamically, allowing for active damping (in car shock absorbers like Delphi Corporation's MagnaRide, for instance). This allows hundreds of watts of mechanical power to be controlled with a few watts of electrical power, which is much more efficient than other methods of vibration control, such as piezoelectric crystals.
They also have friction-reducing capabilities as well. If applied to the surface of a strong enough magnet, such as one made of neodymium, it can glide across smooth surfaces with minimal resistance.
George
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Still, a magebtic liquid does sound fascinating !...Could one heat up a magnet till it melts ?
Men are the same as women, just inside out !
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quote:
Originally posted by neilep
Still, a magebtic liquid does sound fascinating !...Could one heat up a magnet till it melts ?
Men are the same as women, just inside out !
If you heat a magnet above its "Curie point" is loses its magnetism:-http://en.wikipedia.org/wiki/Curie_point
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Thanks Robert.
Does ther magnetism return once the magnet cools ?....so where does the magnestism go ?
Men are the same as women, just inside out !
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quote:
Originally posted by neilep
Thanks Robert.
Does ther magnetism return once the magnet cools ?....so where does the magnestism go ?
If the metal is not in a magnetic field, the magnetism will not return on cooling.
After heating the atoms have lost the alignment which caused the metal to be magnetic. Without alignment the magnetic force of each atom is randomly oriented and cancels out any net effect.
Here is a site which shows still and moving pictures of Ferrofluid in magnetic fields:-
http://www.dansdata.com/magnets.htm
When you go to the above site click on this video, its freaky, very T-1000.
(https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2Fi24.photobucket.com%2Falbums%2Fc23%2FSUEDONIM%2Fmpgthumb.jpg&hash=e6e88ff877b8edbd716bab261c376086)
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Woooo !!..that is indeed quite freaky !!...thanks Mr Robert.
Men are the same as women, just inside out !
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OMG that is perfect
i can do what i was hoping i can!
If you had a ring with VERY powerful magnets pointing towards the center of the ring, all the same pole (yeh theyd repel each other alot, but you can fight that) and you put that ferroliquid into it, if you had the magnets set right (slightly stronger ones on the top) you could have a wall of fluid that you could pass through, but wouldnt be visible through....i think. The very center would have influences of all the magnets (the way the feilds are shaped) and therefore you could make it so that it was equally attractive as the area closer to the magnets, if not more attractive.
This might not seem like much, but if it is a Magnetorheological fluid, which gets harder as more magnetic feild is applied, you could make a wall that could be turned on and off quite easily, or made semi permeable!
Doing more research i found there are the same type of thing, only with electrical current, and ones that are both....
I know my idea would work...
and It would be really cool....
ima design one, ill post what i design!
Thank you so much
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Is the liquid still flowing through that magnetic field ?...does the pattern contain streaming liquid ?..
Men are the same as women, just inside out !
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Hey, that's a great idea. I have a good one too. If you've ever read Ender's Game you'll appreciate this. You could make a flash suit with little hinges in the joints filled with a magnetorheological fluid and an electromagnet. When you got hit with the laser a photoelectric material could transfer the current to a generator that would turn on the electromagnet and freeze you in whatever position you are in!!! I have already begun research on these fluids in my chemistry class and it prove quite promising[:D]!!!!!!!
Oh man, I'm so excited just thinking about it!!!
"His mind is the ultimate weapon!"-MacGyver television series
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A magnetorheological fluids, when pured onto a cup, if you put a magnet near it, it gets hard like a rock. when you remove the magnet it goes back to its liquid form. It can go from liquid to solid in less then .1 second (milisecond)-(10% of a second).
Or if you looking for a shear thickening fluid, when force is active fluid turns to solid. It means if you stab a ice pick right in the cup, before you get quarter of you way in the fluid it stops you right in your tracks.(shear thickening fluid), or if your turn the ice pick slowly in a circle motion, then instantly start turn rapidly. It will stop you instantly.
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Oh man, that sounds interesting.
Shear thickening liquids, could you use it to make a liquid floor? The floor can flow (and look really cool) but when you step on it it becomes solid! I love magnets!!![:D]
"His mind is the ultimate weapon!"-MacGyver television series
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Shear thickening liquids doesntt deal with any thing about magnet.
only magnetorheological do.
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No kidding, I was remarking on the original topic of the thread. It was the liquid magnet topic that brought us to the topic of sheer thinckening liquids anyway.
"His mind is the ultimate weapon!"-MacGyver television series
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US Army are using it to make liquid body armors
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I jsut did soem research:
http://flux.aps.org/meetings/YR97/BAPSMAR97/abs/S5460.html
there is a version of this that reacts to an electric current like magnetorheoulogical ones to to magnetic fields.
This is very intresting...
Now what if you had a powerful magnetic field in the shape of a dome?
Then from a helicopter dropped magnetorheuoulogical fluid on it...
Would it build the dome? Actually..i think youd have to apply the bottum parts first...or else it woudl jsut fall down lol
Idk...it seems you could use it for something like that, like portable fluid buildings or something...
You could use the electric one in robotics, as long as an electric current flows through it its hard, but when it stops, it becomes liquid, or soft at least...i can see multiple applicaitons, from grasping hands, to joints that dont need many moving parts, just electrical curents...
or you could make a floor that was on off liquid, just apply eletrical current or magnets or pressure from teh bottum (depending on what it is made of) and you get a solid floor! Take it away, it goes to liquid!
It seems so cool!.
you could use it as a way to protect things, place it in a special container of this, and then you apply pressure, the liquid solidifies to a solid, completly protecting what ever is inside!
Or you could perhaps make a wheel that turned itself sort of (idk just thinking of aplications)
YOu have a large blob of perhaps magnetorheulogical fluid with a sphere in the middle, that has pwerful, horse shoe shaped (to make sure they face the same direction) magnets. By turning these electro magnets off, you could melt and resolidfy areas of the sphere, melt the front area, it becomes liquid and the whole thing rolls forward, then solidify it when it gets under it. I wonder if that would work...
To stop the fluid from being completley lost, you could turn the magnetic field off somewhat, resulting in a soft but not entirely liquid portion of the tire thing.
How hard does this stuff get? You perhaps could use it for bomb containment. Just roll one of these things over the bomb, and harden it!
Im sure if it were big enough, it would contain it!
I wonder what other "Smart fluids" are out there...
Are there any that contract or expand on the applicaiton of electric or magnetic fields/current?
This stuff seems so scifi!
I wonder if it is possible to mix the properties of these?
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Those are all great ideas, and very plausible...if only you could cheaply produce a strong enough magnetic field for that dome thing.
Also, the iron would possible rust, weakening the structure, but if you used steel, I wonder what would happen? Is steel still ferrous? How would metal objects inside the building respond? What if you could make a sort of solid that was malleable but would become rigid in a magnetic field? Sort of like play-doh but could be used to construct reshapable buildings. There seems to be endless possibilities![:D] I see a completely new field of science evolving here.
"His mind is the ultimate weapon!"-MacGyver television series
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it already exists, i just was doing more research, its called rheology.
Its basically a study of things that change viscosity like these fluids, and also non newtonian fluids, like the shear-thickening fluid we talked about.
Im surprised we dont see more aplications of this stuff...it seems very useful...
Maybe ill have to make some cool usages of it!
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While we're talking about magnets, I did some research and found out that people have used strong magnets to levitate objects like water and a frog! Every molecule in the frog is polarized to make it diamagnetic. Pretty neat stuff there too. Hover cars?![:)]
"His mind is the ultimate weapon!"-MacGyver television series
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quote:
Originally posted by Mr Andrew
While we're talking about magnets, I did some research and found out that people have used strong magnets to levitate objects like water and a frog! Every molecule in the frog is polarized to make it diamagnetic. Pretty neat stuff there too. Hover cars?![:)]
"His mind is the ultimate weapon!"-MacGyver television series
SO COULD THEY LEVITATE ME, WOULD THERE BE ANY HARMFUL EFFECTS
Michael
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It is theoretically possible to levitate a human but you would need quite a magnetic field. It's something to work towards.
"His mind is the ultimate weapon!"-MacGyver television series
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quote:
Originally posted by ukmicky
SO COULD THEY LEVITATE ME, WOULD THERE BE ANY HARMFUL EFFECTS
I would have thought that if this was achievable, that some parts of your body would be more susceptible to magnetic fields than other parts, so while some parts are being dragged up by the magnetic fields, other parts are being dragged down by gravity. May be, at very least, a somewhat uncomfortable experience (the exact effect I would guess would depend upon which parts get dragged up and which are still trying to fall down under gravity).
George
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Yeah, you would flop around a lot (the frog did), but you wouldn't be torn apart...unless it was a strong enough magnetic field to overcome the molecular bonding in your tissues!! That's really strong though, so you don't need to worry about that.
Maybe somekind of stabilizing magnets on the heavy parts of your body, so that they are repelled equally as much as the lighter parts? It would probably cost more than it would be worth.[:(] It'd still be really cool though![:D]
"His mind is the ultimate weapon!"-MacGyver television series
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Perhaps if you wrapped yourself in a suit made out of very diamegnetic substance...like bismuth(or however you spell that) Then you could apply a powerful magnetic field underneath you...and up you go! Much easier than relying on your own diamagneticism..
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Lol, bismuth is heavier than lead and pretty rare.
"His mind is the ultimate weapon!"-MacGyver television series
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but it is the most diamagnetic substance...
and it cant be that rare, they use it in shot guns now, as a replacement for lead.
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Would you want to wear a suit filled with bismuth? I don't think you'd be able to move. Good luck with that!![:D]
"His mind is the ultimate weapon!"-MacGyver television series
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well if there was a magnetic field underneath, it would be enough to cancel out gravity and then some.
and a nother question...
do you think there is the inverse of this?
A usbstance that is solid until a magnetic field hits it? then ti becomes soft or liquid until the field is removed?
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If it did exist, I don't think that that substance would work on the same principle. When the liquid becomes solid, it is because the particles align with the magnetic field and thus making the fluid more rigid.
I still like my idea of a sort of clay that would harden in an EM field. There are so many applications...[:)]
"His mind is the ultimate weapon!"-MacGyver television series
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quote:
Originally posted by Mr Andrew
Would you want to wear a suit filled with bismuth? I don't think you'd be able to move. Good luck with that!![:D]
http://www.sciencentral.com/articles/view.php3?type=article&article_id=218392807
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Its kind of sad that we should even need that kind of technology...
E=MC2... m=deg/360 X C... C= PiD
therefore E=deg/360 X 2(PiD)
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The bismuth sutit discussion was not refering to the sear tickening fluid kevlar suits already discussed in this thread but to the possibility of using a suit made out of a higly diamagnetic material, such as bismuth, to allow for the levitation of a person with a strong magnet underneath them, puerly hypothetical.
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hi.... im Charls I dont know what im doing..... Ummmm i love science and im 14 years old... I thought i had an advanced accelarated knowledge about science but reading about the forums you guys were talking about, screwed my mind.... I now realize that im dumb and stupid becase i never, never understand what you guys are doing i just feel so stupid.. IM SO SO SO SORRY... I want to go to yale but i cant anymore because im stupid Yale is too advance for me i even had a B twice in P.E> leading me with a yearly GPA of 3.917 yeah i know stupid P.E. i hate my self now... Well for any advised e mail me ihatemyself_windsor92@hotmail.com
charls Pasion
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hey yalefreak92, i'm only 15. All you have to do is read a lot and use your head, and you can understand what we're talking about. do some searches on google for information.
Oh, and the bismuth suit wasn't even for armor purposes, but for levitation. It would be even worse than the full body suits of armor the medieval knights wore. I would make a very effective tank barrier though!![:p] What if you could mount a levitation (by diamagnetic principles) device on the bottom of a car? Could you make a hover craft? You could use jets of air to steer/move/brake.
Could you make shelves (book/tool/what have you) that had a levitation device on the bottom shelf and amplifiers on mounted on the sides where the shelves would be? Maybe, I'm not entirely sure how this would work, but you could then put things on shelves that "weren't there." The magnetic fields would keep the objects from falling and it would look really cool. What about tables or...WALLS!! The walls could have a levitation field and would stop things from going through but it would look like there was nothing there. You could make elevators too!! Oh man!
"His mind is the ultimate weapon!"-MacGyver television series
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It works in a different way but a superconductor is the most diamagnetic substance - it will expell all field. They have sort of levitated people using superconductors:
http://www.hfml.ru.nl/levitate.html
but it would be nowhere near as fun as being levitated like the frog.
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quote:
Originally posted by realmswalker
OMG that is perfect
i can do what i was hoping i can!
If you had a ring with VERY powerful magnets pointing towards the center of the ring, all the same pole (yeh theyd repel each other alot, but you can fight that) and you put that ferroliquid into it, if you had the magnets set right (slightly stronger ones on the top) you could have a wall of fluid that you could pass through, but wouldnt be visible through....i think. The very center would have influences of all the magnets (the way the feilds are shaped) and therefore you could make it so that it was equally attractive as the area closer to the magnets, if not more attractive.
This might not seem like much, but if it is a Magnetorheological fluid, which gets harder as more magnetic feild is applied, you could make a wall that could be turned on and off quite easily, or made semi permeable!
Doing more research i found there are the same type of thing, only with electrical current, and ones that are both....
I know my idea would work...
and It would be really cool....
ima design one, ill post what i design!
Thank you so much
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greetings I am new to this forum. hmmmmmm Magnets... I am here to learn much about magnetic containment fields. The stronger the better, what difficulties I am experiencing is the heat disapation is going to be a hinderance. Magnetic fields are an energy that is gravity relatively speaking. It is the flow of particles, (energy) in a circular motion. the reason why magnets are not emitting heat while stagnant is because the particles are small enough that they fly through and between the molecules. There are significantly smaller particles than what we are already aware of.
The magnetic containment field will be able to compress air only because of the quantity of smaller particles outweigh that of the compressed air inside the field.
Is there anyone who can direct me to the proper information site that can help me with my search.
this will be used for new propulsion I am currently working on.