h a l f b a k e r yWe have a low common denominator: 2
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This is a material made entirely out of modules that are attached
to each other only through magnetism.
Each module would be one of the group of space-filling
polyhedra.
This material would be self-healing.
Halteres Wear
Halteres_20Wear
[JesusHChrist, Jan 28 2017]
Time crystals, atoms that can't stay still even at absolute zero
http://www.sciencea...atter-time-crystals
... a bit like five year olds, but smaller, and less likely to have chocolate around their mouths [not_morrison_rm, Jan 28 2017]
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Annotation:
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If homogenous, the material would have to very cold. |
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What would give it it's shape? For instance, I can form a cube out of little cubical magnets, but if I bash it out of shape it won't return to the original shape. |
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Also, what would the material be used for? |
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For healing one's self, I assumed |
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Impossible: Earnshaw's theorem. |
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Wouldn't shape return be totally on how strong the magnets are. All materials would bounce back ever so slightly after deformation. |
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As for Earnshaw, the bottom line is static. A slightly dynamic structure could be stable. So some of the modules need to move and require energy of some sort. |
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I imagine this idea would be in the relm of more intricate EM field engineering. |
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Build it, and clever minds will use it. |
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Combine this with Halteres Wear (link) for energy. |
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I may be being dumb, but I still don't understand this. How big are the magnetic polyhedra? If they're radically displaced by an impact, what ensures that they go back together in the same arrangement (as opposed to some other, magnetically-stable arrangement)? |
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Maybe the magnets are encoded pair-matched (like QR codes of N and S poles) so only a specific pair will latch together, or at least so a specific pair has a stronger attraction than other possible pairings. |
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That might possibly work. On the other hand, the structure is not going to be either stiff or (in tension) strong. For example, a rod made of end-to-end magnets will not support its own weight (as a horizontal cantilever) over more than about 15 diameters. If you factor in specific pairing, the strength will necessarily be less (since each magnetic bond must be weaker than that between simple magnets with the same contact area). |
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So, I am still curious as to [JHC]'s application for this material/structure. |
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I wondered if the //suspended// thing was refering to magnetic levitation |
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Perhaps it's time to explore the magnetic properties of cheese...Gouda vs Cheddar etc |
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NB just found the time crystals news on reddit - see link |
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Isn't Bose-Einstein condensate just a some modules(atoms) locked in a paterned structure due to a pure collective EM field not having any disturbing energies to fight? |
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True, The pattern of the EM field of this material is going to have to be something abhorent to nature if it going to have any strength or healing ability. |
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I keep picturing a chain mail made from interlocking horseshoe magnets.
When torn or ripped apart the material would separate the magnets. Since the ends of the half-links in individual rows would need to be + / - / + / - etc... the individual half-links themselves would stay attracted to their torn neighbours and remain in place. When brought back within proximity the two halves of the tear would reattach like a zipper, but could also reattach out of order. |
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[2fries] You have morphed your idea away from leviating magnets -/- and -/+ complexity, back to a straight +/- attraction which can be bought at the local toy or department store. |
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If the module had another dimension so not quite levitating, it could form a solid structure. Maybe the module has surfaces for resting against other modules to help position in the overall push push terrain. It almost has to be a tied knot of magnet push. |
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Think Magnetix but the magnet poles are in the centre of the link and the neutral ends rest on each other. The ultimate puzzle, place one wrong piece and the thing falls apart. |
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Would it be possible to do this with
superconductors (which wjt alluded to with "very
cold") combined with permanent magnets? I'm not
sure how you'd do it, but it's not proven impossible
like with just the permanent magnets. |
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Actually I can almost see how to do this except the
self healing part. |
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Say the shapes are cubes.
Pick three faces, say top, left, and front. These
have a magnet with North Pole facing out.
The opposite three have South Pole facing out. |
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This will make them stick together in a cubic
pattern, but we want a gap between them. So
place a superconductive or diamagnetic material
either between the magnets, or opposing extra
magnets, on each face. If these get close enough,
they will repel the magnets, enough to overpower
the force between the permanent magnets. |
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If you use diamagnetic materials they could only
have a small gap from the magnets as they aren't
very strong. Better may be to use permanent
magnets for both attraction and repulsion between
the adjacent faces, and diamagnetic materials
only to resist turning (if this is possible). (Edited to
add: the diamagnetic material would also need to
stabilise against any sideways sliding force, in case
there aren't more cubes beside it) |
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I saw a levitating lightbulb product; the lightbulb lit up
and
levitated with a computer controlled EM field powering
the
internal magnetic coils. |
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So, do the same thing, but levitate a rubik's cube, and
have
little motors inside it that can rotate the cubettes to give
it
interlocking capability with other rubik's cubes. |
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Then do it with something more interesting than rubik's
cubes. |
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If the plane the assemblage of multiple cubes is floating
has
enough EM energy you could do some variety of "healing" |
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