Brady, your filmmaking equipment and technique have come a long way since these videos from the early days. It'd be cool to visit this lab again with a better camera!
@88Kamikaze69 the resistance caused by the water isn't due to friction but more to the fact that the water absorbs the kinetic energy of the boat, causing it to slow down. So it would slightly increase the speed of the boat, but only very slightly.
he means that if you look at the water drop from the side, on the glass it looks like half a drop, but on the copper the drop is almost round. when he says it is about 90°, he is talking about the angle between the edge of the and the plane of the glass.
If you look at the drop of water while it's resting on the glass, then it's not a spherical ball of water, but like a dome/hemisphere of water, laying heavily on the glass surface. When water sits on the black surface, it forms a sphere, because it's being repelled more. That's the circle/half-circle comparison. The angle is the angle at which the drop of water meets the surface, at the edges of the drop.
@thekid i believe the angles hes refering to is the shape of the droplet on the surface of the two matterials. it sits flater and more abruptly on the glass. so it has more of an angle. the treated copper has more water resistance so the water beads more and has almost no angle of interaction because its not touching it.
I believe shark skin is of a similar design which helps them swim more efficiently through water and is being considered for use in coating submarines.
Yes it would reduce the resistance, and therefore make many boats undrivable. Boats have a pointed front to allow it to cut through water in a straight line, reduce the resistance, and suddenly, you have no control over how your boat moves in the water.
@AfroNinja720 Nobody claimed that it did. But it does create friction which reduces speed and increases fuel consumption. Gliding along on a "cushion of air" as it was would undoubtedly produce a lot less friction if for no other reason than the density difference between air and water.
good point. But still, you need about 1 mm and it isnt very dense, so youcan cover a large area. You could probably use less pure PFTE. But none the less, i'll check out the prices. I thought i saw PFTE, but i'll doublecheck.
no, it would stay floating due to a fenomanin called displacement. Putting an object with weight x in water will cause it to sink untill it displaces x kg(or lb) of water. So if you make sure that the weight of the boat is less then the volume water displaced by the boat in weight, then it will stay floating. What would happen is that you would get a surface that water cant attach to and therefore reduce drag. It gives the ship a kind of smooth film around it the water cant adhear too.
Very informative Neil Shirtcliffe thank you very much for explaining that in detail it's a wonderful thing to inform the human community. also thanks to the uploader whom I have no current knowledge of besides this video. It's also interesting to see the UK comming out with science stuff consistantly.. I wish america had taken this route.
it wouldn't prevent water from going into the fractures, because it's more like a lubricant than a putty. think about it. it doesn't actually seal any holes, it just makes water 'slide around' more easily. so if you were to cut a hole in a material and coat it with a hydrophobic solution, it would be more susceptible to leaks and such. it would help, however if you coated the inside of the boat. this way it makes it easier to remove water from the boat, preventing sinking.
A boat can still sink even if this was on the bottom, but that does raise a good point. If this was on the bottom of a boat, it could prevent water from going into micro-fractures in the hull, and make the boat last longer under general use.
That substance likes water just about as much as I like having a stranger take a dump in my toilet, overflow it, and climb out the window, running away without telling me.
Whether or not it would be touching water, it would still meet the resistance of dispersing the water around it, with the only difference being the fact that there is a thin layer of air separating the bottom of the boat and the water, as opposed to (relatively) direct contact and wetting. Therefore coating the bottom portion of a ship with a super hydrophobic matter would likely make little to no difference. But don't take what I'm saying like it's proven fact, as I could have missed something.
Would the boat have trouble balancing (think of opposite poles with magnets)? Or would it be the exact opposite and act like a shock absorber against rough currents?
i wouldn't know either, but i now that Horatio Nelson (a british naval admiral) coated his war ships in copper because it prevented algea and barnical growth and made his ships more effeciant and therefore faster. So it is doable, but like you said, i have no clue to how much it would cost.
There would be SO much less drag. I don't know how much pressure that thin film of air would take before the water touched the surface, but hypothetically, the hull of the ship would be going through air, and the air would be going through the water. Ship -> water lots of drag. Ship -> air much less, water -> air even less. The only problem I can see is the bow wave from the ship. Massive water pressure at the front might collapse the air film.
what would happen if this is put on a submarine? how would that affect the pressure? would that cause it not to float as well since it is no longer in contact with the water?
@TheUnivers101 There's no telling what someone's going to put in a spray can, there can be any kind of metallic or acrylic bases in the paint, and it dries very quickly and is spayed in an even caoting fine mist, so it wont come off the surface of it's own accord
Will superhydrophobic substances repel oil based paint e.g. the one used for making graffit. And if so, is it possible to create a coating that would prevent graffit from adhering to a surface? Thanks
The video made me wonder what happens when electro wetting meets a super hydrophobic surface does it not work or would it allow you to switch between a thin film and a bead of water, id like to see a video of that being tried.
No, because it only increases buoyancy. It won't cause a lead ball to float on water. Think of it as increasing the water displacement volume, without increasing the weight by much.
He never mentioned "surface tension" that's the whole reason water doesn't touch it. The super-spread is reasonable as well, on a regular surface a given amount of liquid will spread into area A, but on a rough surface, the spikes cover an area a, so the liquid spreads into area A+a.
I heard about these urinals that don't require any flushing. I bet most of the water we use goes down the toilet. What a fantastic water saving idea. Nice comment bro.
i was wondering... because if you put a lotus leaf long enough in the water( which is also hydrophobic surface) it'll get wet somehow... b'coz i tried it lot's of time...(i have lot's of lotus in my house) and i just wonder will this things ok if u dip it in the water for a long time?...
@lhrmeonom Well... unless the material itself gets broken/flattened or whatever I'm thinking it should provide some odd glide and bounch which ought to give enough time above water for new air to collect in the surface if it gets pushed out, no? Nano tube technology ought to be strong enough, so I'm thinking it might reduce drag, speed and fuel consumption quite considerably in theory.
@88Kamikaze69 Well. It would probably in a sense make water slippery. This also means less control on boats, boards, machines of war, etc. But until someone test these suggestions we won't be for sure about what would happen.
+paulspydar He most likely works for a person/company, if it's a proprietary substance and it's leaked it may cost his funder to lose money. He may also want to patent whatever "it" is later if it's something he discovered to make money off of.
I wonder what role surface tension has on that material? Or if surface tension is what makes the water float on the surface of the material (besides the chemical makeup) ?
I'll make a guess that UA-cam has transcoded the video several times over the course of years, which introduced the banding. Brady's work was probably fine: after all a video from 2007 has been aired on the BBC. UA-cam is like the lowest possible common denominator to everything, and throws away half of "HD". It's a shame they don't provide the means to repost the video in the same "thread", preserving all the comments, and the original date.
Boats sink when there is a break in the hull. A hydrophobic surface makes no difference to that, though the bottom of your boat would be shiny most of the time :D
Brady, your filmmaking equipment and technique have come a long way since these videos from the early days. It'd be cool to visit this lab again with a better camera!
6:40 He doesn't ~sound excited :p
This video is awesome and has inspired me to start an independent research project using hydrophobic surfaces.
There's also an interesting phenomenon called electro-wetting, I've worked with that in the past.
The snag historically with super hydrophobic surfaces for industrial applications, is they show little abrasion resistance, and are very delicate.
@88Kamikaze69 the resistance caused by the water isn't due to friction but more to the fact that the water absorbs the kinetic energy of the boat, causing it to slow down. So it would slightly increase the speed of the boat, but only very slightly.
he means that if you look at the water drop from the side, on the glass it looks like half a drop, but on the copper the drop is almost round. when he says it is about 90°, he is talking about the angle between the edge of the and the plane of the glass.
If you look at the drop of water while it's resting on the glass, then it's not a spherical ball of water, but like a dome/hemisphere of water, laying heavily on the glass surface. When water sits on the black surface, it forms a sphere, because it's being repelled more. That's the circle/half-circle comparison. The angle is the angle at which the drop of water meets the surface, at the edges of the drop.
@thekid
i believe the angles hes refering to is the shape of the droplet on the surface of the two matterials. it sits flater and more abruptly on the glass. so it has more of an angle.
the treated copper has more water resistance so the water beads more and has almost no angle of interaction because its not touching it.
I believe shark skin is of a similar design which helps them swim more efficiently through water and is being considered for use in coating submarines.
Yes it would reduce the resistance, and therefore make many boats undrivable. Boats have a pointed front to allow it to cut through water in a straight line, reduce the resistance, and suddenly, you have no control over how your boat moves in the water.
yeah,... no. Goretex, when coated, seals its pores and ruins it as a vapor-passable barrier.
that is a very interesting concept
@AfroNinja720
Nobody claimed that it did.
But it does create friction which reduces speed and increases fuel consumption.
Gliding along on a "cushion of air" as it was would undoubtedly produce a lot less friction if for no other reason than the density difference between air and water.
Wow, this guy have such a deep voice! I wonder if he's in University Choir or something!
good point. But still, you need about 1 mm and it isnt very dense, so youcan cover a large area. You could probably use less pure PFTE. But none the less, i'll check out the prices. I thought i saw PFTE, but i'll doublecheck.
The rough type could be placed on boat bottoms to make less friction.
no, it would stay floating due to a fenomanin called displacement. Putting an object with weight x in water will cause it to sink untill it displaces x kg(or lb) of water. So if you make sure that the weight of the boat is less then the volume water displaced by the boat in weight, then it will stay floating.
What would happen is that you would get a surface that water cant attach to and therefore reduce drag. It gives the ship a kind of smooth film around it the water cant adhear too.
Very informative Neil Shirtcliffe thank you very much for explaining that in detail it's a wonderful thing to inform the human community.
also thanks to the uploader whom I have no current knowledge of besides this video.
It's also interesting to see the UK comming out with science stuff consistantly.. I wish america had taken this route.
If you coated the hull of a sub with this would it reduce friction/ increase speed?
what would happen to the layer of air at great depths?
Good answer!
it wouldn't prevent water from going into the fractures, because it's more like a lubricant than a putty. think about it. it doesn't actually seal any holes, it just makes water 'slide around' more easily. so if you were to cut a hole in a material and coat it with a hydrophobic solution, it would be more susceptible to leaks and such. it would help, however if you coated the inside of the boat. this way it makes it easier to remove water from the boat, preventing sinking.
Brady, come back! with high def and slow-mo cams!
could you but this on car brake disks so they dont get wet when you drvie through a puddle?
A boat can still sink even if this was on the bottom, but that does raise a good point. If this was on the bottom of a boat, it could prevent water from going into micro-fractures in the hull, and make the boat last longer under general use.
@88Kamikaze69 Because the speed boat will not be affected as much of the waters resistance.
i'd like to make home made water reppelent for motorcycle visor.what should i use?
That substance likes water just about as much as I like having a stranger take a dump in my toilet, overflow it, and climb out the window, running away without telling me.
Whether or not it would be touching water, it would still meet the resistance of dispersing the water around it, with the only difference being the fact that there is a thin layer of air separating the bottom of the boat and the water, as opposed to (relatively) direct contact and wetting. Therefore coating the bottom portion of a ship with a super hydrophobic matter would likely make little to no difference. But don't take what I'm saying like it's proven fact, as I could have missed something.
I demand HD, lighting, and better close ups. Please make a sphere coated with it and have the water trapped inside.
Actually it's not that he won't tell you, it's that he can't tell you because it's a very heavily guarded trade secret.
It would also increase fuel efficiency by decreasing the friction between the haul and the water.
Would the boat have trouble balancing (think of opposite poles with magnets)? Or would it be the exact opposite and act like a shock absorber against rough currents?
but will it blend?
i wouldn't know either, but i now that Horatio Nelson (a british naval admiral) coated his war ships in copper because it prevented algea and barnical growth and made his ships more effeciant and therefore faster. So it is doable, but like you said, i have no clue to how much it would cost.
There would be SO much less drag. I don't know how much pressure that thin film of air would take before the water touched the surface, but hypothetically, the hull of the ship would be going through air, and the air would be going through the water. Ship -> water lots of drag. Ship -> air much less, water -> air even less. The only problem I can see is the bow wave from the ship. Massive water pressure at the front might collapse the air film.
Could you make plumbing more efficient with the lack of friction? Aqueducts? Hydro-Electric Generation? Getting the last drop of syrup out?
whats the voltage between the water and copper coated surface?
with a sticky bit on the molecule yes.
Oh, I didn't think of that!
A related question. Would this reduce resistance if put on the ships?
what would happen if you put dry ice in there?
what if you coat a pool with it or a glass?
@FelipeZucchetti It doesn't work that way. This surface isn't reducing the water resistance either
how would that work?
no its also got something else as part of the molecule (rewatch and listen to what he says carefully)
Well, if the boat was covered both inside and out and there was a hole... Would it sink faster or slower?
yes partly but i think the gortex stuff and the prickly copper have something to do with it
very nice video
Would there be less friction on an aquatic vessel if the outside of it's hull was prepared this way?
Isn't that the stuff in canned duster that makes you high if inhaled?
since it would reduce the interaction between the surface and the water, i bet yes
wats with the angle stuff?
i dont understand it could someone explain?
Nope. It just means that there is a strongly convex meniscus where the hull meets the water. Hydrophobic =/= *cannot* touch water, as the video shows.
what would happen if this is put on a submarine? how would that affect the pressure? would that cause it not to float as well since it is no longer in contact with the water?
Is it just me or does this guy look like he could pass for Freddy Mercury?
***** I was thinking a Steve-O/Jude Law combo, but damn now I see a lot of Freddie
***** I was going to say that in a comment, but I came down here and you said it first. If he had the stache he'd look like him for sure.
What happens if this stuff is sprayed on a surfboard or boat?
@deth84 He mentions lots of other applications.
@TheUnivers101 There's no telling what someone's going to put in a spray can, there can be any kind of metallic or acrylic bases in the paint, and it dries very quickly and is spayed in an even caoting fine mist, so it wont come off the surface of it's own accord
Will superhydrophobic substances repel oil based paint e.g. the one used for making graffit. And if so, is it possible to create a coating that would prevent graffit from adhering to a surface?
Thanks
Is it possible to manufacture flat shoes with this substance to walk on water?
would it work as a wind shield? for a car?
If you made a body suit out of it and jumped into a pool would you just fall to the bottom?
what happens if you pour water on them in a vacume?
The video made me wonder what happens when electro wetting meets a super hydrophobic surface does it not work or would it allow you to switch between a thin film and a bead of water, id like to see a video of that being tried.
No, because it only increases buoyancy.
It won't cause a lead ball to float on water.
Think of it as increasing the water displacement volume, without increasing the weight by much.
@NexIuguolo : what happens if the copper(alloy) is finished to a mirror (0.05micron) prior application of the "teflon"
will it slide better??
If it couldn't touch water what would it float on...?
so basically if you spray yourself completely with this stuff you won't be sweaty ever again?
He never mentioned "surface tension" that's the whole reason water doesn't touch it.
The super-spread is reasonable as well, on a regular surface a given amount of liquid will spread into area A, but on a rough surface, the spikes cover an area a, so the liquid spreads into area A+a.
I heard about these urinals that don't require any flushing. I bet most of the water we use goes down the toilet. What a fantastic water saving idea. Nice comment bro.
what is you had a super hydrophobic shamwow?
i was wondering... because if you put a lotus leaf long enough in the water( which is also hydrophobic surface) it'll get wet somehow... b'coz i tried it lot's of time...(i have lot's of lotus in my house) and i just wonder will this things ok if u dip it in the water for a long time?...
@marcusbondi I'm sure you're right.
Do you know at all what is friction?
Would a boat sink if you put this on the bottom?
@lhrmeonom
Well... unless the material itself gets broken/flattened or whatever I'm thinking it should provide some odd glide and bounch which ought to give enough time above water for new air to collect in the surface if it gets pushed out, no?
Nano tube technology ought to be strong enough, so I'm thinking it might reduce drag, speed and fuel consumption quite considerably in theory.
where do you get this stuff and how expensive is it? looked around on their site and didn't see where to buy it
Windshields/screens made of this glass?
What if we could hover by putting water at the bottom of an enclosed glass hull of some vehicle and a piece of oxidized copper like that as a surface?
ok...
but will it blend?
If you coat an egg in soot (hold it over a smoky candle), you can hold it in a glass of water and it will shine like a mirror!
@88Kamikaze69 Well. It would probably in a sense make water slippery. This also means less control on boats, boards, machines of war, etc. But until someone test these suggestions we won't be for sure about what would happen.
why wouldn't he say whats on the other end of the bond? (like Teflon) @ about 0:31
+paulspydar He most likely works for a person/company, if it's a proprietary substance and it's leaked it may cost his funder to lose money. He may also want to patent whatever "it" is later if it's something he discovered to make money off of.
what i want to know is, is it flamable?
It'd probably float even higher. Or flop onto the side.
is this a way to make bullets ceep their energy up when fired under water?
What if you coat an entire room with this stuff, furniture and everything and just starting squirting water in?
chack wikipedia with wordphrase "hydrophobe". the article has diagrams with the contact angle explanations.
i dint get it did people search Super hydrophobic substances just to dislike it
for 240p, this is really good quality
I wonder what role surface tension has on that material? Or if surface tension is what makes the water float on the surface of the material (besides the chemical makeup) ?
He said that it's PTFE with something else attached.
substitute for world cup ski and snowboard bases as well as surfboards, wake/kiteboards etc... perhaps. super fast!
I'll make a guess that UA-cam has transcoded the video several times over the course of years, which introduced the banding. Brady's work was probably fine: after all a video from 2007 has been aired on the BBC. UA-cam is like the lowest possible common denominator to everything, and throws away half of "HD". It's a shame they don't provide the means to repost the video in the same "thread", preserving all the comments, and the original date.
Boats sink when there is a break in the hull. A hydrophobic surface makes no difference to that, though the bottom of your boat would be shiny most of the time :D
How would it save fuel?
Why we no use this on car windows.
This is a great video 😁