Magnetic fluids

[Ethereally Luminous]

Are there any known fluids that generate their own magnetic field?

[Mr Skeptic]

Unlikely. It would have to have some way of keeping some form of rigidity, otherwise parts would rotate to minimize their energy and cancel out the magnetic field. But maybe something like a liquid crystal might work?

[TonyMcC]

Apparently the motion of molten iron rich material in the earth's core is reponsible for the earth's magnetic field. I suppose molten iron counts as a liquid.

[Mr Skeptic]

Apparently the motion of molten iron rich material in the earth's core is reponsible for the earth's magnetic field. I suppose molten iron counts as a liquid.

 

That's an electromagnet though. I got the impression he was talking about permanent magnets.

[alpha2cen]

When water flow in the water pipe, water flow makes electric current perpendicular to the flow.

By using this current we can measure the flow rate.

[TonyMcC]

When water flow in the water pipe, water flow makes electric current perpendicular to the flow.

By using this current we can measure the flow rate.

An interesting application - although this is another electromagnetic application.

[alpha2cen]

This is old technology.

Before 1980 the technology had been commercialized.

Difficult problem is a measuring of very low voltage electric current.

[TonyMcC]

This is old technology.

Before 1980 the technology had been commercialized.

Difficult problem is a measuring of very low voltage electric current.

I have a fairly wide experience of electronic applications but this one was new to me. Always interested in different ways to use electricity/electronics/magnetism etc..

[steevey]

Are there any known fluids that generate their own magnetic field?

 

Yes, Ferro Fluid is magnetic and responds to magnetic fields. Otherwise in planets like Jupiter, you have liquid metallic hydrogen, which is a liquid and for some reason is highly magnetic and is one of the reasons Jupiter has such a powerful magnetic field.

 

 

http://www.youtube.c...h?v=me5Zzm2TXh4

 

 

http://www.youtube.c...h?v=zpBxCnHU8Ao

Edited December 19, 2010 by steevey

[imatfaal]

Ferrofluid is a colloidal suspension - ie there are nano-particles of magnetic solid within a fluid.

[steevey]

Ferrofluid is a colloidal suspension - ie there are nano-particles of magnetic solid within a fluid.

 

What about molten iron then? It would have a weak magnetic field, but I bet if the temperature was low enough, it could have some type of structure to sustain it as a liquid.

Edited December 20, 2010 by steevey

[Mr Skeptic]

Well before its melting point, iron is no longer magnetic. (as a conductor it can still be used to make an electromagnet though).

[Ethereally Luminous]

Yes, Ferro Fluid is magnetic and responds to magnetic fields. Otherwise in planets like Jupiter, you have liquid metallic hydrogen, which is a liquid and for some reason is highly magnetic and is one of the reasons Jupiter has such a powerful magnetic field.

 

 

http://www.youtube.c...h?v=me5Zzm2TXh4

 

 

http://www.youtube.c...h?v=zpBxCnHU8Ao

 

 

I've read about Ferro Fluids but I didnt think they created their own magnetic field

Edited January 4, 2011 by Ethereally Luminous

[trane]

How rigid can a ferro fluid shape be made? I'm sure it depends on the EM strength.... but has anyone tried to make a really rigid shape?

 

....And can a em field be controlled to make primitive shapes; cube, cylinder, cone, etc? Is there a study on em field manipulation and the effects on ferro fluid? seems like a flexible bladder filled with ferrofluid could be made to take on a variety of shapes.... your thoughts?

 

I'm eager to learn about EM field manipulation and ferro fluids! I've got a science project in mind... I'd like to come up with a way to measure the "RIGIDITY" of ferro fluid under the influence of an EM field. But I'd like to see if it's possible to inject ferro fluid into a balloon, bag, or bladder, filling it with no air pockets... then applying a magnetic field from OUTSIDE the bladder in hopes to manipulate the bladder's shape. I want to measure how rigid the fluid in the bag gets.

 

Does anyone have any suggestions as to how I can scientifically measure the rigidity? I'd like to come out with some kind of pounds per square inch model.... but I'm not sure how to set up that kind of measurement.

 

Any suggestions?

 

My goal is to see if it's possible to create primitive shapes like cubes, globes, and cones out of the baggie filled with ferro fluid. And to see how solid they can become.

 

Any help on this would be greatly appreciated!