Scientists Gain Understanding of Key Nanoscale Force

Researchers offer method for overcoming atomic forces on the surface of materials that cause friction

2 min read
Scientists Gain Understanding of Key Nanoscale Force

When we get down to the nanoscale the world of macroscale physical phenomena we are familiar with is replaced in large part by a new set of phenomena. Among the key forces in this strange new world are Brownian motion and van der Waal forces. One of the great challenges of working on the nanoscale is finding ways to engineer things (move them around and generally get things to do what we want) with atomic forces such as these governing the nanoscale universe.

In a recent article here on the pages of Spectrum online the work of researchers Professor Robert Carpick at the University of Pennsylvania and Professor James Hone at Columbia University, in New York City has given us some better insight into how friction occurs at the atomic scale and how to engineer around atomic forces like the van der Waal force.

According to the Spectrum article, the researchers, who did much of their research with graphene, discovered that the thinner the sheets of the material the greater the friction.

The researchers observed that the atomic forces such as van der Waal forces would cause the sheets of graphene to be attracted to the tip of the atomic-force microscope as it drew closer thus bending the graphene and creating a “puckering effect” on the surface of the graphene. This puckering is what caused the friction.

To overcome this puckering effect the researchers also observed that the thicker the sheets the less they would bend when subjected to the atomic forces. 

By gaining a better understanding of the surface phenomenon at the atomic level, the researchers believe this will help in the engineering for microelectromechanical systems (MEMS) devices and ultimately nanoelectromechanical systems (NEMS) devices. Meanwhile the researchers note that other work is going on now to figure out the best number of sheets of a material to combat this type of friction.

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Two Startups Are Bringing Fiber to the Processor

Avicena’s blue microLEDs are the dark horse in a race with Ayar Labs’ laser-based system

5 min read
Diffuse blue light shines from a patterned surface through a ring. A blue cable leads away from it.

Avicena’s microLED chiplets could one day link all the CPUs in a computer cluster together.

Avicena

If a CPU in Seoul sends a byte of data to a processor in Prague, the information covers most of the distance as light, zipping along with no resistance. But put both those processors on the same motherboard, and they’ll need to communicate over energy-sapping copper, which slow the communication speeds possible within computers. Two Silicon Valley startups, Avicena and Ayar Labs, are doing something about that longstanding limit. If they succeed in their attempts to finally bring optical fiber all the way to the processor, it might not just accelerate computing—it might also remake it.

Both companies are developing fiber-connected chiplets, small chips meant to share a high-bandwidth connection with CPUs and other data-hungry silicon in a shared package. They are each ramping up production in 2023, though it may be a couple of years before we see a computer on the market with either product.

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