Need to melt ice? Try high voltage metal
As winter approaches, many in the United States are eagerly anticipating the first snowfall of the season, which brings with it the joy of sledding and hot cocoa. However, the beauty of a snowy landscape often gives way to the burdensome task of dealing with ice. From scraping frost off car windshields to maintaining heat pumps, the icy aftermath can be a hassle. Traditional deicing methods, often involving costly chemicals and energy-intensive heaters, are not always effective. However, researchers at Virginia Tech have developed a groundbreaking method known as electrostatic defrosting (EDF), which could revolutionize how we approach ice removal.
The EDF technique utilizes an electrically charged copper plate positioned above frost-covered surfaces. Through a process that exploits the molecular structure of frost, negatively charged ions in the frost are attracted to the positively charged plate, while the frost’s positive charges are repelled downwards. This interaction causes frost particles to “jump” towards the plate, allowing for significant mass removal. In their experiments, the team successfully removed up to 75% of the frost’s mass by gradually increasing the voltage applied to the copper plate. Their findings, published in the journal *Small Methods*, highlight a novel approach to ice removal that could potentially replace traditional methods, making it both cost-effective and energy-efficient.
Building on previous research that involved a thin layer of water above artificially grown frost, the Virginia Tech team discovered that the misalignment of ionic charges in frost molecules creates an opportunity for manipulation. Their initial tests with the copper plate showed promising results, with frost removal rates increasing with voltage until a point of diminishing returns was reached. Ultimately, by addressing issues of charge leakage with improved insulation techniques, the researchers were able to achieve their best results yet. While the current method does not eliminate frost completely, it holds promise for various applications, from cars to airplanes, suggesting a future where deicing is simpler and more efficient. As winter descends, this innovative technique could change the way we contend with ice, making snowy days a little less burdensome.
As winter approaches, large swaths of the United States are eagerly awaiting their first big
snowfalls
of the season. As the snowflakes fall, many will dig out old, rusted sleds, toil over shaping the perfect snowball, and relish an evening brought back to life by a
warm cup of hot cocoa
. But then
comes the ice
.
Picturesque snow days are often replaced by long hours spent hand-scraping frosted ice off car windshields, heat pumps, and other areas around the house. On an industrial level, businesses wheel out giant heaters and use
chemicals to expedite the melting process
, which can be both costly and energy-intensive. But researchers at Virginia Tech think they may have discovered a fundamentally different deicing method, one made possible by essentially tricking ice at its molecular level.
The team calls their new melting technique electrostatic defrosting (EDF). It involves hovering an electrically charged copper plate over frost-covered surfaces. The negatively charged ions in the frost are attracted to the positively charged plate overhead, while the frost’s positive charges are repelled downward. This attraction is strong enough to cause frost particles to “jump” toward the plate. By gradually increasing the voltage, the researchers were eventually able to remove up to 75 percent of the frost’s mass. The team
detailed their findings in a study recently published in
Small Methods
.
Fighting frost with water molecules
This new copper plate research
builds on earlier work conducted by the same team
, involving a suspended water film. In that experiment, the engineers artificially grew frost on several surfaces and used filter paper to hold a thin layer of water just above it. The negative charges at the top of the frost layer were attracted to the positive ions in the water film. Together, they formed a small electromagnetic field. The force exerted on the frost was strong enough to “detach” small frost bits, causing them to move towards the water. Researchers were actually able to capture the exact moment the frost particles jumped off using a high-speed camera.
CREDIT: Virgina Tech.
This whole chemical process is a byproduct of the way that frost naturally forms at the molecular level. As ice grows, the molecules arrange themselves like pieces of a puzzle. But it isn’t always perfect. Sometimes certain pieces, in this case positively and negatively charged hydrogen ions, are missing. That misalignment in charges results in what scientists call ionic defects. In the water-film experiment, negative ionic defects in the ice migrated toward the top of the frost layer, while positive ionic defects moved toward the bottom.
Ice is no match for high voltage
Understanding that basic scientific concept of frost’s misaligned molecules, the Virginia Tech team believed an externally charged copper plate should be able to essentially replicate the effect of the water film but even more powerfully. It turns out, they were right.
They started their first test by hovering the copper plate above frost without any applied voltage. This setup removed 15 percent of the frost after just a few minutes. When they added 120 volts to the plate, it removed 40 percent of the frost. At 550 volts, it removed 50 percent. During testing, the charges were strong enough to gradually reveal a hidden Virginia Tech logo that had previously been buried beneath the frosty surface.
Proof-of-concept for electrostatic defrosting (EDF).
Image: Yashasvi Lolla et al.
Small Methods
, 2025
One might assume that adding even more voltage would lead to continued increases in frost removal—but that didn’t happen. When the researchers ticked the power to 1,100 volts, the frost mass was reduced by only 30 percent. At an even higher 5,500 volts, just 20 percent was removed. Somehow, the charge was “leaking.”
“We really thought we were onto something here,” study co-author and Virginia Tech mechanical engineer Jonathan Boreyko
said in a statement
. “Keep turning up the voltage and more frost will jump away, right? What was unexpected was when the opposite happened.”
The team eventually resolved the charge leakage issue by growing the artificial frost on a highly insulated, air-trapping superhydrophobic surface. With the leakage eliminated, they were able to remove 75 percent of the frost.
Associate Professor Jonathan Boreyko introduces voltage to a layer of frost in his lab, moving his defrosting research forward with a new approach.
Image: Photo by Alex Parrish for Virginia Tech.
However, the engineers caution that the findings are still early and limited, they were never able to remove 100 percent of the frost in their experiments. And as newbies to icy sidewalks know, even a thin layer of leftover ice is enough to send legs flailing.
Still they remain hopeful. With more research, this electrostatic defrosting technique could lead to an affordable and energy-efficient method of deicing everything from cars and airplane wings to residential heat pumps.
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Need to melt ice? Try high voltage metal
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