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E.g., 07/23/2019
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Your search has returned 957 articles:
  • News

    Permanent liquid magnets have now been created in the lab

    The rules about what makes a good magnet may not be as rigid as scientists thought. Using a mixture containing magnetic nanoparticles, researchers have now created liquid droplets that behave like tiny bar magnets.  

    Magnets that generate persistent magnetic fields typically are composed of solids like iron, where the magnetic poles of densely packed atoms are all locked in the same...

    07/18/2019 - 14:00 Materials, Physics
  • News

    Latest claim of turning hydrogen into a metal may be the most solid yet

    Physicists are crushing it — hydrogen, that is. Squeezing the chemical element to extremely high pressure transforms it into a metal, a trio of researchers claims.

    The purported metallic hydrogen appeared at a pressure more than 4 million times that of Earth’s atmosphere, the scientists report June 13 at arXiv.org. If confirmed, the achievement would fulfill a long-standing quest to...

    06/28/2019 - 08:00 Materials, Condensed Matter
  • 50 years ago, bulletproof armor was getting light enough to wear

    Lighter bulletproof vest —

    A new, lighter bulletproof armor ... composed of boron carbide fibers ... [is] capable of stopping a .30-caliber bullet.... The armor weighs about six pounds per square foot, compared to previous boron carbide armor of seven pounds per square foot.... Until now boron carbide armor has been used mainly to protect vital helicopter parts, but the lighter...

    06/20/2019 - 07:00 Materials
  • Feature

    How seafood shells could help solve the plastic waste problem

    Lobster bisque and shrimp cocktail make for scrumptious meals, but at a price. The food industry generates 6 million to 8 million metric tons of crab, shrimp and lobster shell waste every year. Depending on the country, those claws and legs largely get dumped back into the ocean or into landfills.

    In many of those same landfills, plastic trash relentlessly accumulates. Humans have...

    06/19/2019 - 11:00 Chemistry, Materials, Sustainability
  • News in Brief

    A new graphene foam stays squishy at the coldest temperatures

    A new graphene-based foam is the first material to remain soft and squishy even at deep cryogenic temperatures.

    Most materials become stiff and brittle in extreme cold. But the new foam stays superelastic even when it’s subjected to the temperature of liquid helium: –269.15° Celsius. A material that remains pliable at such low temperatures could be used to build devices for use in space...

    04/12/2019 - 14:00 Materials
  • News in Brief

    Bacteria can be coaxed into making the toughest kind of spider silk

    Bacteria are helping to make engineered silk that rivals the strength and stretchiness of a spider’s stiff dragline silk, the type from which the arachnids dangle. 

    Pound for pound, dragline silk is stronger and tougher than steel. Engineers have tried for decades to create a synthetic mimic from genetically modified bacteria, yeast and even goat milk, but have always fallen short. 

    ...
    04/02/2019 - 17:17 Materials, Chemistry
  • Science Visualized

    How droplets of oil or water can glow vibrant colors

    Oil and water may not mix, but the two have now revealed a new example of structural color, in which an object’s hue arises from its shape.

    Studying droplets made of two layers of clear oil, researchers discovered that, depending on a viewer’s perspective, the tiny blobs glowed a variety of vibrant colors under white light. In a petri dish, same-sized droplets changed color as the dish...

    03/08/2019 - 14:00 Physics, Materials
  • News

    A new insulation material is practically weightless yet still durable

    A new, nearly weightless insulation material can withstand extreme heat that would destroy other materials.

    The porous aerogel is at least 99 percent open space, with the rest made up of an atomically thin ceramic called hexagonal boron nitride. The design proves extremely durable under high temperatures and rapid temperature shifts of over 1,000 degrees Celsius, researchers report in...

    02/14/2019 - 14:00 Materials, Technology
  • Teaser

    A new fabric becomes more breathable as you work up a sweat

    Someday, the same shirt could be part of your summer and winter wardrobe, using fabric that alternates between breathable and insulating.

    Unlike other heat-accommodating cloth, which has to be flipped inside out to switch from warm to cool (SN: 2/17/18, p. 5), the new dual-use fabric adapts to how much the wearer is sweating. This material may be useful for making sportswear or clothing...

    02/08/2019 - 11:05 Materials