Placeholder Image

字幕列表 影片播放

  • Scientists have discovered a new form of ice using diamonds, x-rays, and a bunch of ultra-powerful

  • lasers, and this new ice could tell us more about the inside of planets.

  • I know that sounded like science-themed mad libs, but I promise you it’s true.

  • The first thing you should know is there are way more known iterations of ice than you

  • probably expected.

  • The kind you’d find in your freezer or in your drink is called ice I.

  • Actually, there are two forms of Ice one, that kind is called ice Ih, the h stands for

  • hexagonalafter the hexagon shape the frozen water molecules form which differentiates

  • it from the more cuboidal shape of ice Ic.

  • Wow, two forms of ice?

  • Ice, ice, baby.

  • Can it get any crazier?

  • Oh, yes it can.

  • It can get crazy 17 more times, because including this newly discovered form of ice, were

  • up to 19 total crystalline arrangements of H2O.

  • Water can form so many different lattice structures in part because of the molecule’s bent shape

  • plus its hydrogen bonds to other water molecules which can lead to complex arrangements.

  • But our newest confirmed form of ice, called ice XVIII, is something altogether different.

  • Instead of being like the ice in your fridge, white and cold, it’s black and hot.

  • It was first predicted by a computer model from 1988.

  • The simulation suggested a new form of ice occurs at high temperatures and pressures,

  • above 2000 kelvin and above 100 gigapascals.

  • For reference, water at the deepest point on the ocean floor is under about 1000 times

  • less pressure.

  • These conditions rip the hydrogen atoms off their oxygen partners, losing their electrons

  • and essentially becoming positively charged protons.

  • The oxygen atoms are packed into a cubic lattice, while the freed protons flow around them like

  • a liquid.

  • This high concentration of flowing ions should actually conduct electricity about as well

  • as other semimetals like arsenic or graphite, just using freely moving protons instead of

  • electrons.

  • Predicting this superionic form of ice on an old computer is one thing, but observing

  • it is quite another.

  • In order to create this form of ice, scientists compressed water between diamonds to build

  • up the pressure.

  • Then they blasted it with lasers, 6 of them in fact.

  • They couldn’t hit it with one big blast because that would put it over ice XVIII’s

  • predicted melting point.

  • Instead, they used timed pulses which explosively vaporized the diamond containing the water

  • and caused a massive spike in temperature and pressure.

  • In order to see what was happening inside the water at the exact moment pressure peaked,

  • scientists shot 16 more laser beams at an adjacent piece of iron, which vaporized and

  • sent X-rays through the water.

  • Basically, it was a flippin' laser jamboree up in there.

  • Based on the diffraction of the X-rays, the scientists confirmed the oxygen atoms formed

  • the nanometer sized cubic lattices predicted by computer models.

  • All of this is very interesting to planetary scientists, because the conditions for ice

  • XVIII are probably right inside ice giant planets like Uranus and Neptune.

  • Ice XVIII’s structure and properties could explain some odd phenomena of these planets,

  • like the shape of their magnetic fields.

  • Earth and most planets in the solar system have a magnetic field like a bar magnet with

  • two poles, and the magnetic poles line up well with the axis of rotation.

  • This is likely due to conductive fluids inside the planet swirling with the planet’s rotation.

  • But ice giants have magnetic fields that are more lumpy, with multiple poles and no correlation

  • with how the planet spins.

  • An interior made up of ice XVIII would mean the planets have a solid-ish core that wouldn’t

  • really churn, with a thin shell of flowing ionic water above it that could account for

  • the odd magnetic field.

  • There’s still plenty more research to do though, because ice giants probably have other

  • molecules like methane and ammonia in the mix that could change how the water behaves

  • deep below the surface.

  • And technology has advanced enough to take a snapshot of the oxygen atom lattice, but

  • we still haven’t seen the flowing hydrogen ions.

  • I guess that means we gotta shoot more lasers.

  • Sweet.

  • Thanks for watching, if you liked this video subscribe and check out another I did on a

  • new phase of matter that’s solid and liquid at the same time.

  • For you Vonnegut fans out there, yes there is an Ice IX, but good news, it will not destroy

  • the planet.

  • That’s all for now, see you next time on Seeker.

Scientists have discovered a new form of ice using diamonds, x-rays, and a bunch of ultra-powerful

字幕與單字

單字即點即查 點擊單字可以查詢單字解釋

B2 中高級

最新形式的水是熱的、黑的,等等什麼? (The Newest Form of Water Is Hot and Black, Wait What?)

  • 6 1
    林宜悉 發佈於 2021 年 01 月 14 日
影片單字