Added: Jul 26, 2008
From: elratanegra
Duration: 3:0
A fluorocarbon-based ferrofluid, with about 400-G saturation magnetization and low field magnetic susceptibility of 3, is placed within a glass Hele-Shaw cell of 1.1-mm gap. Magnetic fields are applied that have in-plane clockwise rotating and dc axial magnetic fields. The ferrofluid is surrounded by a 50/50 mixture of isopropyl alcohol and deionized water, which prevents ferrofluid wetting of the glass plates. In all cases, the rotational field strength is 20 G rms, and the frequency is 25 Hz. The dc magnetic field will be increased from 0 to 100 to 200 G.The first experiment uses a 50-µl drop of ferrofluid. The dc axial field is first increased to 100 G, and then the clockwise rotating field is turned on. The ferrofluid drop is circular before the magnetic field is applied. When the dc magnetic field is applied, the ferrofluid drop forms a spiking labyrinth pattern. Then the clockwise rotating field is applied, and the spikes begin to curl in on themselves, forming a smooth spiral pattern after some of the spikes are absorbed into the larger structure. The smooth spirals form from viscous shear as the clockwise rotating magnetic field causes counterclockwise flow on the outside ferrofluid surfaces, which return on the inside surfaces.The second experiment uses a 200-µl drop of ferrofluid. First, the clockwise rotating field is applied, which causes a counterclockwise flow that holds the circular fluid drop together without spikes. Then a 100-G dc axial field is gradually applied. This results in the ferrofluid drop appearing to expand before a phaselike transition at a critical dc magnetic field strength around 100 G. Careful observations show that the pattern forms at slightly less than 100-G dc field under a thin ferrofluid coating on the top glass plate, which then abruptly peels away at slightly increased dc axial magnetic field. The magnetic field is then increased from 100 to 200 G to form an intricate internal pattern surrounded by a circle of ferrofluid with spiraled arms. The second experiment is repeated again three more times under essentially identical conditions, with common features but it appears that the fine features are different each time.Acknowledgments: This research is supported by National Science Foundation Grant No. CTS-0084070. We gratefully thank Ferrofluidics Corp., now FerroTec Corp., for contributing the ferrofluid used in these experiments.
Channel: Howto
Tags: science
Rating: 4.66 (770 ratings) Views: 457614' favoriteCount='2391 Comments: 708
karisbella Says:
Jul 26, 2008 - fake or not, it's cool
gwapa001 Says:
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rippemies Says:
Jul 26, 2008 - Whoa. To be sure, the science behind this is beyond my grasp, but it's beautiful.
jeffgooloolie Says:
Jul 26, 2008 - The Flying Spaghetti Monster is Born!
peter1114222 Says:
Jul 26, 2008 - if any of you think this is fake just check out some cymatic videos they might blow your mind.
shawnmking Says:
Jul 26, 2008 - is it just me could the gravitation feilds of our planet effect the build of a mirco organism, cuz they look alike
fericire7 Says:
Jul 26, 2008 - this is truly incredible, the forms just make me think of hidden meanings and philosophy of life, spiraling from low to high, death-life cycle so it has wave form, some say in spiral... and all the forms just look like some ancient drawings
randomae Says:
Jul 26, 2008 - it doesn't even look real. thats so cool
thorpe31 Says:
Jul 26, 2008 - WOW THAT IS COOOOL
leee9393 Says:
Jul 26, 2008 - This is a cool video but I dont have a clue what the hell is going on in it lol
Kilajula Says:
Jul 26, 2008 - So, pretty much ferro fluid in an MRI scanner, right?This explains a lot of the odd feelings I get during my scans. O_O
whoiscatnow Says:
Jul 26, 2008 - obvius cgi
gmoliveira814 Says:
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pauljs75 Says:
Jul 26, 2008 - For some reason part b strikes this scenario in my imagination, provided it scales to the microscopic level: A primordial chemical soup above a vein of natural magnetite. In the chemcial soup, there are aminos and other compounds diamagnetic or polar in nature. Then there's a natural weathering process to agitate the chemical soup above the magnetite. Thus the chaotic patterns from the fields imprint themselves upon the chemicals as the blueprint. *Now cue playing of: Also Sprach Zarathrustra*
FEARTTX Says:
Jul 26, 2008 - AHHH FIBANOCI SEQUENCE IN ACTION!! WE'RE ALL GONNA DIE... No, Srsly, that's cool. GJ.~FEARTTX
lusulpher Says:
Jul 26, 2008 - Yeah...magnetic fields may have influenced the shape of smallscale organic life and possibly Evolution. Like how you stated that so simply.]D-
4ce619 Says:
Jul 26, 2008 - Uhhh.. wtf was that? Cropcircles?Anyways, it was kinda cool.
KingNast Says:
Jul 26, 2008 - 200 gauss isn't much. This looks like they just pulled the rotor out of an AC motor and put the ferrofluid in the middle of the stator coil
KingNast Says:
Jul 26, 2008 - idiot
KingNast Says:
Jul 26, 2008 - how can you make that determination if you don't know what it is?
KingNast Says:
Jul 26, 2008 - it's MIT
psytheriatsunami Says:
Jul 26, 2008 - OMG its the image of God itself! the mighty spaggeti monster!
03cammd79 Says:
Jul 26, 2008 - well i know what it is now, i looked into it afterwards cus i'd heard about the thing where you put sand on a metal plate and play a note through it, its not as if i ever thought this was fake...I just cant belive you read though 20 pages of comments on this video just to find mine so you could complain at me without thinking that what i said was 5 months old...
TheFerruccio Says:
Jul 26, 2008 - This experiment has been touched by His Noodly Appendage
jesseinsouthflorida Says:
Jul 26, 2008 - GEEKS!!!