Solving another mystery of an amazing water walker

Dec 10, 2007
Solving another mystery of an amazing water walker
Scientists have found a new explanation for the water strider's "miraculous" ability to lead onto a liquid surface without sinking. Credit: Ho-Young Kim, Seoul National University, Korea

Walking on water may seem like a miracle to humans, but it is a ho-hum for the water strider and scientists who already solved the mystery of that amazing ability. Now researchers in Korea are reporting a long-sought explanation for the water strider’s baffling ability to leap onto a liquid surface without sinking. The study is scheduled for the Dec. 18 issue of ACS’ Langmuir.

In the new study, Ho-Young Kim and Duck-Gyu Lee note that scientists already have discovered the hydrophobic, or water-repellent, structure of the water strider’s legs and how they allowed the creatures to scoot along ponds and placid lakes. However, their ability to jump onto or “bounce” off liquid surfaces remained a lingering scientific mystery.

Kim and Lee solved it by dropping a highly water-repellent sphere onto the surface of water at different speeds, carefully tracking its motion with high-speed cameras. They found that the ball must be traveling within a narrow velocity range in order to bounce off the water’s surface. The sphere may sink if it goes too fast and won’t bounce back if too slow.

“The highly improved ability of heavy hydrophobic solids to keep afloat on water even after impacting upon water with a high velocity appears to explain partially why water striders have superhydrophobic legs,” say the authors. “Application of our study can be extended to developing semi-aquatic robots that mimic such insects having the surprising mobility on water.”

Source: American Chemical Society

Explore further: 'Treasure in saliva' may reveal deadly diseases early enough to treat them

add to favorites email to friend print save as pdf

Related Stories

$58 million effort to study potential new energy source

Oct 22, 2014

A research team led by The University of Texas at Austin has been awarded approximately $58 million to analyze deposits of frozen methane under the Gulf of Mexico that hold enormous potential to increase ...

Recommended for you

Water purification at the molecular level

4 hours ago

(Phys.org) —Fracking for oil and gas is a dirty business. The process uses millions of gallons of water laced with chemicals and sand. Most of the contaminated water is trucked to treatment plants to be ...

Why plants don't get sunburn

Oct 29, 2014

Plants rely on sunlight to make their food, but they also need protection from its harmful rays, just like humans do. Recently, scientists discovered a group of molecules in plants that shields them from ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.