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Graphene-The more you bend, the softer it becomes

wallpapers Tech 2021-01-06
The latest research by engineers at the University of Illinois combines atomic-scale experiments with computer modeling to determine the energy required to bend multilayer graphene. Researchers say that graphene-a single layer of carbon atoms arranged in a lattice-is the strongest material in the world, and it is so thin that it is flexible. It is considered one of the key elements of future technology.
 
Most current research on graphene is aimed at the development of nanoscale electronic devices. However, the researchers say that many technologies-from stretchable electronic devices to miniature robots so small that they cannot be seen with the naked eye-need to understand the mechanics of graphene, especially how graphene bends and bends in order to release Its potential.
 
"The bending stiffness of a material is one of its most basic mechanical properties," said Edmund Han, a graduate student and research co-author of materials science and engineering. "Although we have been studying graphene for two decades, we have not yet solved this very basic property. The reason is that different research groups have come up with different answers that span orders of magnitude."
 
Around van der Zand, the co-author of Mechanical Science and Engineering and Research, said: "The exciting thing about this work is that it shows that even if everyone disagrees, they are actually correct." "Everyone The team is measuring different things. What we found is a model that explains all the differences by showing how they are related to each other through varying degrees of bending."
 
To make curved graphene, Yu processed a single atomic layer of hexagonal boron nitride, another 2D material, into atomic steps, and then pressed the graphene on top. Han cut a piece of material with a focused ion beam and imaged the atomic structure with an electron microscope to see the position of each graphene layer.
 
Huang Pingshan, professor of materials science and engineering and research co-author, said: “In this simple structure, bending graphene involves two forces.” “Adhesion or the attraction of atoms to the surface tries to pull the material down. The harder it is, the more it will bounce back and resist the pull of adhesion. The shape of the graphene occupying the atomic steps encodes all the information about the stiffness of the material.".
 
Elif Ertekin, Professor of Mechanical Science and Engineering, said: "Since we have studied the different bending amounts of graphene, we can see the transition from one state to another, from rigid to flexible, and from plate to plate. Behavior." Research. "We built an atomic-scale model to show that this happens because the layers can slide against each other. Once we have this idea, we can use an electron microscope to confirm the sliding between the layers."
 
"Cells can change their shape and respond to their environment. If we want to move towards a micro-robot or system with biological system functions, we need to have a very flexible electronic system that can change its shape," Van der Zande said. For interlayer slip, we have shown that graphene can be orders of magnitude softer than traditional materials of the same thickness. "

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