This is the kind of exciting news that’s going to change science for the ages: Researchers have invented a new type of granular material that doesn’t flow downhill like sand but instead flows uphill, climbing stairs and walls.
What’s more, it has a negative coefficient of friction.
Why?
Because when you have a negative angle of repose, you end up with less cohesion .
The team at Lehigh University makes some changes to the granular flow equations to see if this new material can climb obstacles.
They also use a magnetic field to increase the strength of the particles, so they can climb tiny staircases.
The work is published in the journal Nature Communications.
From an hourglass to the dunes on a beach, we know that sand flows downhill.
That’s just what granular materials do.
However, scientists have now found a way to make granular substances that don’t just flow downhill but actually flow uphill.
This new stuff is called microrollers
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