AMAZING! Ferrofluid + Glow Sticks
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- čas přidán 25. 08. 2024
- Ferrofluid is a liquid that displays unusual properties in the presence of a magnetic field. Watch what happens when we mix ferrofluid with the liquid from a glow stick!
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This is why I love Science, even when you think you know everything about 2 separate things you can always find a way to mix them together and create something new.
Brilliant!
Ça fait plaisir de te voir ici ! ;)
Ferrofluid lava lamps now!
+Lucas Balaminut It's been done. www.kickstarter.com/projects/1880422811/ferrofluid-a-symbol-of-the-future/description
Inspired Designs OH HOW AWESOME! Thanks so much.
+Inspired Designs That design is somewhat..... crap and short sighted. If you have what is basically a lava lamp setup then why force folks to mess about holding magnets to get a result. Why not simply run a rod up inside it and have it activate as an electromagnet. Hook it to something like an arduino with a program and you can have pulses and patters of magnetic waves causing the basic lava lamp to take an evolutionary leap in what it does.
I have a ferrosand hourglass
+Bean Sprugget that would be awesome!!
This channel is easily among my top 5.
Your videos are awesome
Just wanted to say thank you this is so cool for my 7yr old daughter, when I have her for my visitation I think she will really like this again thank you and God Bless
Why a finite number of discrete spikes? Aren't fields supposedly continuous?
+David Battle It's the Feynmans Double slit made visible in Makro Scale. This is Nobel price stuff!
+David Battle You recently see the detected scan render of the field rings coming out of earth? they're not continuous. quantum hax i think is your answer.
+David Battle
I like you, you look like Mr Potato Head.
+Kaironex Cryziz Can you send a link to this? It sounds very interesting!
+David Battle First things first: There is no way that any quantum effects are visible at that temperature and without vacuum, it is a purely classical effect. Moreover we have a static phenomenon, so any explanation using waves (which are not static) cannot be the answer.
I've found a likely explanation further down in the comments*. The magnetic field is not homogeneous, which means that the fieldlines point away from each other, so the liquid is pulled apart. When liquid is pulled apart you see effects from the surface tension (e.g. water building drops) which cause it to cluster.
So in a sense the spikes are drops pulled from the liquid. This is a simplified model for the forces that act on the liquid, but I think it gets the general point across.
*credit to +alcaz0r1
You should get a Patrion account.
So far I haven't seen a vid of yours I haven't liked.
My daughter's response to the warning at 0:24 - "I want to try this at home!"
That looks so cool!! Love your videos, always so interesting and easy to understand. Thank you for your work Dianna!
This is too cool. I could watch this all day!
+CZcams Aneesh Me too! This is one of those videos where I actually enjoyed watching all of the extra footage while editing. It's so pretty!
+Physics Girl Awesome Video ! Thank you Physics Girl ! Do you plan on Going to France someday like for a convention or anything ? Or switzerland ? CERN maybe ?
I love seeing the reaction-diffusion pattern that forms after the field's removed.
Last time a girl told me to meet her in a garage I woke up in a bathtub full of ice with a missing kidney.
"There's so much physics happening here!" ... Really, can you think of a single situation where there ISN'T a bunch of physics happening?
I love your examples and experiments of concepts in physics. I have a degree in physics, yet often I wasn't sure how the concepts I learned could be reflected in the physical world. I really appreciate your videos for that reason. :)
My favorite parts of your videos are when you discover some new interesting and unexpected phenomenon! Keep up the great work :)
I've seen some really cool sculptures with ferro fluid.endless posibilties with this stuff.
Last part with the dry ice was really cool. Could it bee that when you held it there it melted a spike pattern into it, making it's most comfortable position on those spikes that fits. And then the rest of the spikes around it works similar to a Leidenfrost effect to push it upwards?
Would love some in depth explanation of this though =)
My explanation for the appearance of spikes: - The ferromagnetic particles become tiny magnets and align themselves in the direction of the field. This means that at say, the magnet's North pole, they stack up with each particle's North pole joined to the next particle's South pole, in a chain aligned with the field, pointing away from the pole. However, this means that at the end of a bundle of chains, at the ferrofluid surface, there are many North poles next to each other with no attached South poles. Since North repels North, the bundles of chains are driven to repel each other, while surface tension draws the surface inbetween them, and they split into spikes, rather than terminating in a smooth dome over the pole.
thank u physics girl. I set that Oefner's art work as my desktop background. so one day that I had a presentation, my prof. asked me about it. and I couldn't explain the hydrophobicity correctly and he mocked me for it.
Now I have a good explanation! tnx
+Physics Girl My dad is a highschool physics teacher and I had him as my physics teacher when I was in highschool... and my older sister was in the same class as me as well!^.^
Very nice video... The observation with the dry ice is really a curious case. It reminds so much of the Meissner effect, but the puzzle is that carbon dioxide is not a superconductor at its freezing point. I gotta do this experiment.
Why can't we try this at home?
I don't know how hazardous nanoparticles of metal are for you. But mainly, it's the chemicals in the glow sticks that are not good for you, especially not for kids who often watch my channel!
+Physics Girl And is it messy or what!!
+Physics Girl yep. Most glow stick chemicals will cause rashes and irritate skin. Also, not a good idea to try to make glowing lipstick with it for a female friend.... I wouldn't know though....
+Physics Girl And break the glowstick from they suvivalist parents...And then blame YOU!!!
+kcthewanderer you can try this at home i have, make sure you have the proper setup (i.e. snorkel for poison gas removal and a solution concentrate to dilute the solution you make)
I'm just happy to hear you pronounce the word "experiment" correctly. That might sound strange, but you would be surprised at the number of hosts of "science" channels which get it wrong, including Hank from SciShow.
+Skeletor Jopko I watched 4 times trying to find her pronounce "experiment" but I can't find a single instance. I'm going to have to watch all her videos now!
Katie Gilligan 3:29 in this video.
+Skeletor Jopko You mean when people say "expeeeriment"?
Matthew Henderson Or, as Hank Green pronounces it, "ex-spearmint".
Anyone got an explanation for the observation with the dry ice? That was really cool!
+FartingNinjaFrog I'd like to hear one too!
+Physics Girl so the magnetite particles are suspended in a fluid medium maybe that medium crystallises and binds with the dry ice suspending the magnetite in a crystalline medium forced in a pattern that corresponds with the magnetic field lines and that might be why it reverts back to position it was in before
+FartingNinjaFrog
Hypothesis: When you hold the dry ice on the ferro fluid the nano particles are frozen into a particular magnetic arrangement against the surface of the dry ice. If this is done long enough for a large number of particles to accumulate in alignment with each other they will create their own magnetic field (just like how molten iron can harden into a magnet when allowed to solidify slowly in a strong magnetic field). These frozen particles then interact with the field of the magnet below the tray and drag the dry ice (which they are frozen to) back into alignment with the magnet.
To test this, after this effect establishes itself you should try removing the dry ice and see how much ferro fluid is sticking. Next flip the magnet over and test weather it now repels the CO2/ferrofluid combination. Likewise you should be able to stick the CO2 (with the ferrofluid ice magnet side) onto the permanent magnet. You might get ferrofluid on the magnet but such is the price of science.
...Maybe put the magnet in a plastic bag before trying this.
+Physics Girl The dry ice likely only repels the ferrofluid due to out-gassing. Ferrofluid sticks to surfaces notoriously well. It likely began to stick to the dry ice as you left it in place and one the ferrofluid began to embed itself in the material it will make it attract to the center of the magnet.
By the way, we are experts in making ferrofluid displays and would love to collaborate on something with you if your open to it! Or just donate some stuff for you to experiment with.
+Inspired Designs send me an email! dianna at physics girl dot org
Do we know how ferrofluids behave around magnets in microgravity?
+Jennifer Serene i don't think that gravity play a big role in this experiment. Ferrofluid particles just align with the field lines.
+Jennifer Serene Am not sure, but i think ferrofluids react to magnets just because the fluid has iron in it.
+Baptiste PARIS so do you thing that in microgravity ferrofluid would just form an orb around a magnet, or would you see it streaming out following the magnetic field lines?
+Jennifer Serene i think the surface tension of the fluid would prevent the spikes from streaming out and follow an entire field line. We would see just what we see in this video.
But this is the theory! A real experiment could make us say "hey, that's cool! That wasn't expected at all!"
+Jennifer Serene It has been tested in space on the ISS, for some reason it was just a suspended blob with no spikes. The magnet just moved the blob around slowly.
I was at the MIT museum this past weekend with a few students.. and there was a photograph taken of ferrofluid on the microscopic level.. i let my mind wander and remember thinking: maybe there is a field that binds all matter together in a similar way and that if you were able to remove the field.. all matter would lose its attraction to one another and turn into an unrecognizable goo just like this ferrofluid.. that there is something inherent within matter that reacts with the field in a particular way that gives rise to protons and neutrons and molecules and all the rest..
and then you post a video of ferrofluid a few days later.. very nice! :D
in the late 80's and 90's it was used in tweeters and mid range speakers to keep voice coils cool and to increase power handling
it was cool to see how the magnetic field changed as the magnet got closer. it seemed to change the ferrofluid from something resembling a brain to looking like a fingerprint to finally spikes.
I'm so glad I found this channel. Thanks for the video.
I've already done some projects with this fluid. they're very cool.
I'm being the 2nd. Hey, Diane, just to thank you for making such awesome videos of physics. I myself am a great fan of physics and its supercool awesomeness, so thanks again for making such beautiful videos.
I was already the favourite Uncle .. cannot wait to blow out a candle with an "empty" glass & watch the wow in their eyes ..
Thanks :)
I want to elaborate a bit because I see some people are still confused as to why the ferrofluid spikes the way it does. She said they point along the direction of the magnetic field lines, not that they align to them. I think that's the source of confusion. The magnetic field is continuous. The distance between the spikes is determined by both the magnetic field and the surface tension (as well as some properties within the ferrofluid itself such as magnetic susceptibility.) It's a balancing act between many forces and the spikes are energetically favorable. It is not the manifestation of randomness. I can perform an experiment to demonstrate this if there is interest.
Amazing shots, i will pick up this idea on my macro channel:) Thx and Cheers from AnotherPerspective
You explained ferrofluid so much better than most channels
F = q(v x B) and T(surface tension)=(h*rho*r*g)/2 put into F=ma
Holy crap that's a lot of physics. I love it!
Just for the record, magnetite is not a metal. It is an oxide with the formula Fe3O4. And what really disturbs me is that no one seems to have noticed it.
I have a hypothesis for the dry ice suddenly switching direction.
I think it's happening because the ferroliquid freezes and then sticks onto the dry ice, which means the whole underside functions as a magnet that is then attracted to center
we got to play with metal filings + magnetic fields in school. That was cool, don't get me wrong, but it was 2D -- the metal filings are on paper. The 3D aspect of this really adds to it. Let alone mixing in the glowstick stuff. Good job!
When the magnet is too close, filings tend to clump around the edges of that magnet and may fall flat due to gravity and mixing with fields on the sides. Pull the magnet away a bit (add a board under the paper, if necessary,) and the inner fields will be more prominent, allowing a more compact crown of filings to stand up better against gravity. The ferrofluid shows this because its surface tension and thickness usually keep it from thinning out and clumping around the edge the same way.
You might also have had too much iron mass for the size of your magnet, to be able to see the spiking effect. A little sprinkle is generally enough to play with, but fun stuff can be done with more, too.
I'm totally trying this at home...
Your videos are the best on youtube
I liked this video mostly because I thought the last few comments on dry ice behaviour were cool as.. Thanks for your work! :D
I dont know why but seeing that gave me chills!!!!
if you have a powerful enough magnet and some ferrofluid, could you make spikes that could potentially pierce skin? That'd be pretty sweet for SO many applications....... like the T-1000....
This video was so informative. I liked the explanation for how the ferrofluid worked.
honestly i have learnt more interesting stuff and better in the 3 weeks ive watched of your vids than my whole physics unit about certain liquids and their behaviours... and for this i thank you, alot. I have an avid interest in physics and chemistry and im just about to start my A-levels studying them. :-)
also there is a 2018 CERN trip, I can't wait!!
Wow. You just made Feynmans double slit pattern visible in makro-scale!
I just love learning ❤️
How am i supposed not to do it RIGHT NOW!? that was beautiful
Questions:
What if you touch it?
What do the spikes feel like: Solid or liquid?
What if you ate it?
How is this found?
What if you mixed it with lead?
Can you make slime with it?
I saw this done with what seemed to be a cone with a long strip of electromagnetic wound across it, to the end. The result was like nothing I'd ever seen without the aid of a CGI.
This is very similar to the Messiner Effect.
The dry ice and its cold temperature was expelling the magnetic field but not the magnetic fluid and it was riding an induced electric field generated by its own cold temperature. This acted as an electric conduction motor of sorts and the ice moved on its own to the center. This is very educational if you want to teach about electromagnetic fields.
If the ice was any colder it would have started levitating at the center where the magnetic field lines are most numerous and therefore strongest.
So alien / awesome! Thanks for the great explanation.
A wild guess as to the ferrofluid observation: I think some of the ferrofluid froze onto the dry ice, making a dry-ice-cum-metal lump. The metal end of the lump wanted to stay near the magnet, at the top of the mound, so it was attracted there. It stayed on top due to the relative density.
I've seen something similar done with dish soap and pulverized iron filings.
That's how it should be shown in schools :3 Awesome!
I don't understand the science but this is cool af, same as pretty much all the other videos I can't understand physics well apparently but it's still cool
This is really amazing!
Do you have more Photos like this??
THIS IS SO COOL! I adore you so much!! :)
That would be such a cool sci-fi effect in a video game !
That was absolutely awesome. :) I'm really tempted to break out my ferrofluid goop and try this.
+The Gentleman Physicist Your ferrofluid/superconductor video was pretty cool too. :)
Glad you liked it. I'm hoping I can finally get back to making videos now that I've landed gainful employment again. :P
You rock! Subscribed.
Brains and beauty :)
Quality. Diana Cowern on a mission to get girls I to Physics. And us guys too. Her videos breath fresh air. Just proves your enthusiasm will rub off on your viewers
the dry ice could induce a higher conductivity in the magnetite, strengthening the field and locking it in place.
BE WARNED!!
There is a jumpscare at 1:17
i was gonna say those would make awesome wallpapers, but looks like oefner has already done it
That is so interesting and cool! When the spikes form, are they hard like a nail or pliable!?
Es maravillosa tu página🏅🏅 FELICIDADES
Awesome stuff! Would it be possible to make a magnetic gas if enough particles were airborne?
3:20 There's a misconception that ferromagnetic powder and ferrofluid tend to group into the magnetic lines. There is no discrete number of lines to be "grouped into", instead there are infinitely many lines and the ferrofluid only aligns with them. I don't fully understand how it works, though. It would be awesome if she made a video about it.
So... Totally... Awesome!!!
I wanna try that.
OMG that's so amazing!
now i have to reasurch vander walls force haha sweet vid!
Imagine this being a screen saver :D also I found your channel not that long ago and I love it keep making awesome physics videos !!!
Wow that looks awesome!
What's the song that starts at 0:34 ??
Great video btw, would really like to understand the dry ice behavior.
This looks so cool!
That dry ice experiment immediately made me think of super-cooled superconductors. I wonder if there is a connection.
+TheToeminator Same here. But superconductors (that we know of) are much colder.
This video is so much better than the one from CrazyRussianHacker, amazing macro shots and actual information
I really feel like some kind of electromagnet array thing should be put together, put under the ferrofluid (with the glowstick goo). Then you could feed a music track into software controlling an array, and have a physical music visualizer. Should do that...
The magnetic field lines drawn at 1:32 are confusing. They seem to be going both counter-clock-wise and clock-wise. The center lines are going down, so wouldn't the right-hand rule indicate that the side lines should only be going clock-wise? Are the lines correct and my understanding of magnetic field lines incorrect, or is something else going on?
MORE ! I want MORE videos ^^
On a serious note, these videos are really great. Congrats ! Ferromag fluids have a lot of interesting properties, and we still don't know/understand many of them. I'm sure applications will be found with it.
+Ezor There are many applications. The list below is from ferrofluid.today/pages/what-is-ferrofluid
Cooling in loudspeakers for better sound, Liquid O-rings for making computer chips, Magnetic hyperthermia for better chemotherapy, Targeted drug delivery for cancer treatment, Shape shifting mirrors, Space craft propulsion, Keeping you curious
Rave fluid! Love it
Why have I never seen your channel before?! Omg. This is awesome ! Subbed. :D
My guess is that it rolled back to the top because it had ferrofluid on it, so if it was on top of what is more or less a friction-less surface { suspended on points } the ferrofluid on top of the chunk of dry ice would be enough to pull it to the top to follow the field lines
The question I have is: How does the magnet get so cold when conduction is limited to the surface contact between the dry ice and the ferrofluid { essentially just a few points } ?
Nice explanation!
Rather than using a chemiluminescent material that will soon fade, how about some sort of fluorescent fluid(s) and an ultraviolet light?
resembles the organic behavior similar to cell growth in time laps.
Interesting... the tendency of the dry ice to move back to the position in which it was held is very similar to superconductor "flux pinning." If I were to hazard a guess, I would say that the dry ice cools the ferrofluid surrounding it, fixing it in place on the dry ice surface and locking in the magnetic moment of these particles. Because the magnetic moments are aligned with the external magnetic field at this position, if the dry ice moves, it will bring some of the particles out of their desired alignment, creating a torque that would resist this movement.
+James Endres Unlikely. The ferrofluid is not nearly cool enough for superconducting behavior.
+Mod MINI I agree. I was not trying to say that the ferrofluid is becoming superconducting. I was trying to say that this may be similar to "flux pinning". With a superconductor, flux pinning occurs because eddie currents in the superconductor generate magnetic moments that align with the external magnetic field.This then causes the superconductor to resist a change in orientation with respect to the external magnetic field. In the case of the ferrofluid, the magnetic particles within the fluid, would align their magnetic moments with the external field and then the dry ice physically freezes them in place, where they then resist a change in orientation. It is the same idea as flux pinning in a superconductor, but it would be caused by a different mechanism.
+Mod MINI Not cold enough for certain old style super conductors, however they keep discovering materials that work at higher and higher temperatures. Also theoretically there can be room temperature super conductors, and lots of scientists have spent much time and effort searching for them...
Very informative, thanks.
Nice to see you're still going strong!
Looks awesome!
Wait a minute, that's actually very interesting! Why does the dry ice go up the mound of ferrofluid? That's almost like Flux Pinning with superconductors!
I think holding it onto the fluid creates a smooth shallow cavity at the bottom of the chunk. And it's just geometry from there. No?
You can try this at home. You can buy ferrofluid and glowsticks online for cheaply and as long as you don't eat the stuff you'll be fine.
That's amazing! and beautiful as well
I wonder if the dry ice incorporated (froze) some of the ferrofluid, which caused it to eventually "roll up hill"?
Why shouldn't I try this at home? It's fantastic! :)
This is my new favorite channel.
Dianna, does the dry ice "going up hill" have anything to do with Flux pinning? en.wikipedia.org/wiki/Flux_pinning
Kinda like that lexus hoverboard that uses liquid nitrogen?
I remember doing that back in 2006!
i use to approach this effect with less toxic materials in the µg range :D