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2/11/10 Scientists freeze water with heat

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  • 2/11/10 Scientists freeze water with heat

    Imagine water freezing solid even as it's heating up. Such are the bizarre tricks scientists now find water is capable of.

    Popular belief contends that water freezes at 32 degrees Fahrenheit (0 degrees Celsius). Surprisingly, if water lies in a smooth bottle and is free of any dust, it can stay liquid down to minus 40 degrees F (minus 40 degrees C) in what's called "supercooled" form. The dust and rough surfaces that water is normally found in contact with in nature can serve as the kernels around which ice crystals form.

    Now researcher Igor Lubomirsky at the Weizmann Institute of Science in Rehovot, Israel, and his colleagues have discovered another way to control the freezing point of water via what are called quasi-amorphous pyroelectric thin films. These surfaces change their electrical charge depending on their temperature.

    When pyroelectic surfaces are positively charged, water becomes easier to freeze, and when they have a negative charge, it becomes harder to freeze.

    The researchers saw that supercooled water could freeze as it's being heated, as long as the temperature changes the surface charge as well. For instance, when supercooled water is on a negatively charged lithium tantalate surface, it will freeze solid immediately when the surface is heated to 17.6 degrees F (minus 8 degrees C) and its charge switches to positive.

    Curiously, positively charged surfaces inspire supercooled water to freeze from the bottom up, while negatively charged surfaces cause it to freeze from the top down. This likely has to do with how water molecules orient themselves the negatively charged oxygen atoms in water molecules naturally point toward positively charged surfaces, while the reverse is true with hydrogen atoms.

    "The difference between the positive and negative charge was unexpected," Lubomirsky said.

    The ability to better control the freezing temperature of supercooled water could be critical for a variety of applications, including the survival of cold-blooded animals, the cryo-preservation of cells and tissues, the protection of crops from freezing, and the ability to understand and trigger cloud formation.

    The scientists detailed their findings in the Feb. 5 issue of the journal Science.

    Source: http://www.msnbc.msn.com/id/35351575...nce/?gt1=43001
    ~*And to the fans, I'll never let you down again, I'm back I promise to never go back on that promise*~

  • #2
    So I guess I can't tell people anymore "ya...I'll do that.... When he'll freezes over".... Now that it's actually possible
    -Da homies n dat ILL Overnight Bank$ Clique(OBC)-
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    • #3
      Science, huh?

      Comment


      • #4
        science blows....my mind!
        ima do me.

        Comment


        • #5
          we're fucked

          Comment


          • #6
            warm water freezes faster than cold, so i see this possible
            04
            best class of rb...end of discussion
            Tanner, Otto, Slyk, Dirty F, Magnum, Italian Em, Noid 4 Vet
            XBL: Passed0utAwake
            ^thats a zero not an O

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            • #7
              Wow.. That's fucking crazy shit!

              Comment


              • #8
                does that mean global warming is over?? lol


                as it gets hotter the ice caps will reform...that would be an interesting thing

                im not being serious.. ;P
                If you can't think of anything to say, attack the spelling

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                • #9
                  vintage scientists
                  Originally posted by FunkySuicideGirl
                  Ima sucker when some suck my lip or bite in it
                  Originally posted by Syko Squidge
                  ^
                  fuck off you gay piece of cunt
                  Originally posted by Otto
                  That shit is fuck,

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                  • #10
                    Originally posted by Stick137 View Post
                    and the ability to understand and trigger cloud formation. http://www.msnbc.msn.com/id/35351575...nce/?gt1=43001
                    why the fuck would they wanna do that?
                    punk me! ill kill u, get my knife an peel u,
                    keep a piece of ya skin wit me just to say that i feel u!

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                    • #11
                      Now that shit was so fuck.

                      Comment


                      • #12
                        "The researchers saw that supercooled water could freeze as it's being heated, as long as the temperature changes the surface charge as well. For instance, when supercooled water is on a negatively charged lithium tantalate surface, it will freeze solid immediately when the surface is heated to 17.6 degrees F (minus 8 degrees C) and its charge switches to positive."

                        im no scientist so i could be missing the principle somewhere but 17 degrees F isnt really warm at all.. when they started talking about particle charges it turned german to me but from what i understand its not so much warming the liquid but the liquid being freezing at two different temps (one being warmer than the other)
                        R.I.P.
                        MICHAEL
                        "KING OF POP"
                        JACKSON

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