Researching are using sound waves to levitate and move hovering cells, DNA, toothpicks, water droplets, and other small bits of material in different directions. Eventually, the technique could be used for a "lab on a chip" or to transport hazardous or sensitive chemicals or biological materials in the laboratory. Watch the explosion above when sodium and a water droplet collide! ETH Zurich mechanical engineer Dimos Poulikakos and his colleagues reported their results in the new Proceedings of the National Academy of Sciences. From Science News:
To achieve levitation, Poulikakos and colleagues vibrate aluminum blocks about the size of postage stamps up and down, like tiny jackhammers. The rapid buzz kicks up sound waves that sail upward until they hit a Plexiglas reflector and then bounce back down to the blocks.
When these falling waves run into the climbing ones, they can cancel out, creating a low-pressure pocket that can support an object’s weight.
By adjusting vibration rates to control the position of the pocket, the researchers could float particles across a chessboard of the aluminum blocks.
"Sound waves put levitation on the move
When Zoe Stavri woke up with a yeast infection, she had a strange and intriguing idea: what about adding some of her vaginal candida to sourdough starter?
Nick Sousanis, who delivered his doctoral dissertation in comic book form, has a new comic in the current Nature magazine, explaining the last 25 years’ worth of climate talks, as a primer in advance of the Paris climate talks next week.
Randall “XKCD” Munroe’s Thing Explainer: Complicated Stuff in Simple Words arrives in stores today: it combines technical diagrams and wordplay in pure display of everything that makes XKCD brilliant and wonderful in every way.
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