Removing snow piled high in parking lots and along roadsides could soon be a far less tedious task. In a study appearing in ACS' journal Langmuir, scientists report that they have tested sunlight-absorbing thermal blankets capable of melting snow three times faster than it would on its own.

They say the blankets could slash snow-removal costs and reduce the risk of environmental contamination caused by soot and other products used to melt the white stuff.

Fresh snow reflects most of the sunlight shining on it, as well as much of the heat from those rays, back into the air. As a result, huge heaps of plowed snow can linger for weeks, even when the air is above freezing. Most cities in snow-prone regions either haul it to disposal sites or use gas-powered heaters to melt it.

Both of these approaches are labor-intensive, time-consuming and costly. Depositing soot on fallen snow is an ancient, but effective way to increase sunlight absorption and speed up melting.

However, soot, antifreeze and other commercial melting products can contaminate water and soil. Jonathan B. Boreyko and colleagues sought to find a more environmentally friendly way to melt snow using a new type of thin, conductive and thermally absorbent metal blanket.

The researchers created three types of these blankets made with an aluminum alloy. Two were coated with black enamel or black silicon-based spray paint that readily absorbed sunlight.

The third blanket was bare aluminum, which reflected sunlight about as well as snow. In laboratory experiments, each of the blankets was draped over a pile of man-made snow stored in a refrigerated container.

Then, the blanketed piles plus a pile of uncovered snow were exposed to a high-intensity lamp, which simulated sunlight. Snow under the bare aluminum blanket melted at about the same rate as uncovered snow.

However, both of the blankets coated in black paint accelerated melting by about 300 percent, as measured by water runoff. The researchers conclude that these absorptive blankets could be used to quickly melt snowbanks in parking lots, driveways or roadsides without using heaters, soot or chemicals.

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Skiers take to Paris streets as snow prompts travel chaos
Paris (AFP) Feb 7, 2018
Skiers swished down the hilly streets of Montmartre in Paris on Wednesday, taking advantage of heavy snowfall that otherwise spelled misery for thousands of travellers. Nearly 2,000 people in the Paris region had to spend Tuesday night in their cars, according to police, after the snow caused traffic jams that stretched a record 740 kilometres (460 miles) and left hundreds of others stuck at airports and train stations. The icy roads of Paris were unusually quiet after 12 centimetres (nearly fiv ... read more