Video Of A Magic Knife Cutting A Water Droplet In Half

October 3, 2012


This is a short video of a magic knife slicing a water droplet in half. Except it's not really magic, because scientists had to go and ruin all the fun for us. You could have lied to us, you know. The government does it all the f***ing time.

The core of the blade is two 0.020-inch thick zinc and copper sheets. After forging it, it was cleaned with acetone, ethanol, deionized water and then air-dried with nitrogen. Then the researchers dipped it in "a 10 nanomolar aqueous solution of silver nitrate for approximately 20 seconds." Finally, they added the magic element, dipping it in a 1 nanomolar solution of substance called HDFT.

This seemingly magic material and manufacturing method can revolutionize biomedicine, allowing the separation of proteins in biological fluids "without troubling satellite drop formation."

Hey, I'm all for revolutionizing biomedicine and all, but I'm also all for cutting water balloons perfectly in half with a ninja sword. Think about how cool that'll look in slow motion! "I think you're missing the big picture here, GW." A MOVIE?! We could totally make it a movie!

Hit the jump for the video.

Thanks to Rev Dr Dom, who's never cut water with a knife but has cracked the crust on the top of crème brûlée before with a spoon. Equally impressive!

  • ZomBBombeR

    Wonder how it works on blood??

  • Adibobea9

    But can it cut through a shoe?

  • AdvancePlays

    If a water droplet is small enough, surely any knife could cut it thanks to all that fancy spangly surface-tension stuff :P Pretty cool, but does the world really need to be able to cut a water droplet in half? :P

  • Jon Jusjohn

    I've worked in the water droplet cutting industry for nigh on 30 years now and this is a huge step forward. I don't appreciate you putting my livelihood down.

  • AdvancePlays

    I thought that with you obviously being smart enough to get a job in what's most likely chemistry based, that you'd have noticed that there ':P', which denotes the satire in that last sentence.

  • Ragnogroth

    That's just as impressive as if a superarachnophobic person stabbed a spider.

  • GreyGanado

    Nice one.

  • Patrick Caldwell


  • Patrick Caldwell

    Using a hydrophobic knife to cut water. OH BOY!

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