The real cool-looking action starts at 1:10, and 2:25 is teh awesome.
YT description:
The first two parts of the video show the impact dynamic of 30 microliters water
droplet at different impact velocity. At low impact velocity of 1.03 m/s, the water droplet deforms upon impact and eventually bounces off completely of the surface of the array. At higher impact velocity of 2.21 m/s, the droplet breaks up into many smaller droplets and eventually bounces off completely
of the surface of the array.
The coefficient of restitution of water droplet at very low impact velocity can be seen clearly by dropping a water droplet on a slightly tilted carbon nanotube array. At tilt angle of 2.5 degrees the droplet skips off of the surface of
the array multiple times without showing any sign of pinning on the surface
of the array, as demonstrated in the third part of the video. The fourth
part of the video shows the sliding/rolling behavior of the droplet along the
surface of a U-shaped carbon nanotube array. The fifth part of the video
shows the impact of two identical 14 microliters water droplets to one another on a U-shaped carbon nanotube arrays. Upon impact, these two water droplets, which come from the opposite direction, merge to form one larger droplet.
All parts of the video were captured by high speed camera operated at
various frame rates. The droplet was illuminated from behind with a diffuse
halogen light. The droplet was dropped on the surface by at-tipped needle
and the volume of the droplet was controlled precisely by syringe pump.
Video from the paper "Bouncing Water Droplet on a Superhydrophobic Carbon Nanotube Array," authored by Adrianus I. Aria, Morteza Gharib:
http://arxiv.org/abs/1010.1351 This work was supported by The Charyk Foundation and The Fletcher Jones Foundation.
22 Comments
BoneRemake*water
triumphtigercubReally?!
JiggaJonsonIf I didn't know better I'd swear they were conducting this in zero gravity.
thegrimsleeperYou had me at superhydrophobic.
also *timeshift
siftbotAdding video to channels (Timeshift) - requested by thegrimsleeper.
RyjkyjHow many droplets have to merge before they become one drop?
Drachen_Jagersays...When they get a process going that can make carbon nanotubes at industrial volumes it will be as significant (if not more) than the development of steel. This is THE materials science breakthrough of our generation.
A 1 mm thick nanotube wire could hold 6,000 KG of weight. It is thirty times stronger than Kevlar and nearly a hundred times stronger than the finest steel.
EDD>> ^Drachen_Jager:
When they get a process going that can make carbon nanotubes at industrial volumes it will be as significant (if not more) than the development of steel. This is THE materials science breakthrough of our generation.
A 1 mm thick nanotube wire could hold 6,000 KG of weight. It is thirty times stronger than Kevlar and nearly a hundred times stronger than the finest steel.
gnarly. you seem to know your carbon nanotubes, so care to explain how the potential projected practical applications of graphene stack up to them?
Drachen_Jagersays...Graphene is essentially the same thing, you could say that nanotubes are tubes made out of graphene. Graphene and nanotubes require the same kind of manufacturing. AFAIK they're farther ahead on developing nanotubes on a large scale than graphene, but any advancements on nanotubes will likely result in a boost to graphene development as well.
>> ^EDD:
>> ^Drachen_Jager:
When they get a process going that can make carbon nanotubes at industrial volumes it will be as significant (if not more) than the development of steel. This is THE materials science breakthrough of our generation.
A 1 mm thick nanotube wire could hold 6,000 KG of weight. It is thirty times stronger than Kevlar and nearly a hundred times stronger than the finest steel.
gnarly. you seem to know your carbon nanotubes, so care to explain how the potential projected practical applications of graphene stack up to them?
deathcowWhew, I'm not a scientist so I was really happy they put arrows on the movie to show exactly when the two droplets merged to form one droplet. I was all like "But I still see two droplets!" and then it turned out it was once the two droplets collided that it happened.
WKBTony Hawk is about 60% water so it makes sense water will naturally master the half pipe.
COriolanuswhat was the air pressure?
residueI didn't realize things could be SUPERhydrophobic, I thought they were just hydrophobic. Hurry up nanotubes, make me a damn space elevator already
I also would like to see these tests at regular speed
PaybackWho else said "boing... boing... boing..." at 1:15?
Psychologic>> ^COriolanus:
what was the air pressure?
I'm guessing this took place at a relatively normal air pressure. If it were a vacuum then they would need to cool the water below ~0C to keep it from boiling (depending on purity).
Now I want to see what happens when the nanotubes are cold enough to form ice crystals within the droplets.
Boise_LibI say, "boing...boing...boing..." everytime I see your avitar.
>> ^Payback:
Who else said "boing... boing... boing..." at 1:15?
robbersdog49I am not a number, I am a free man!
GeeSussFreeKA visual representation of his explanation of one being akin to the other.
http://vimeo.com/groups/3114/videos/8069853
>> ^EDD:
gnarly. you seem to know your carbon nanotubes, so care to explain how the potential projected practical applications of graphene stack up to them?
Lowensays...My mind, it is blown!
juliovega914says...>> ^Drachen_Jager:
When they get a process going that can make carbon nanotubes at industrial volumes it will be as significant (if not more) than the development of steel. This is THE materials science breakthrough of our generation.
A 1 mm thick nanotube wire could hold 6,000 KG of weight. It is thirty times stronger than Kevlar and nearly a hundred times stronger than the finest steel.
This is without even bringing to light their electrical properties. They have a chirality induced band gap, so they can be either semiconductive or metallic based on structure. They are absurdly thermally and (in the case of metallic tubes) electrically conductive, due to ballistic conductivity. Electrical current densities are theorized to be more than 1000 times greater than copper. They truly are a miracle material. Biggest problem is the safety issues and cost of production.
shuacSo... carbon nanotubes are the ultimate ScotchGuard?
swedishfriendsays...Best Scene Demo Ever!
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