The U.S. Department of Energy announced up to $35 million in funding to support a new program to enable zero-process-emission ironmaking and ultra-low life cycle emissions steelmaking.
Continue readingGraphene is extremely strong and good at conducting heat and electrical currents, making it an exceptionally versatile material. Yet, many properties of the material are still poorly understood – for the simple reason that the atoms they are made up of are very difficult to observe. A team of researchers from the University of Amsterdam (UvA) and New York University have now found a surprising way to solve this issue.
Continue reading
The speed at which an atomic force microscope moves across the surface of certain materials is influenced by the frictional properties of the substrate. One such example is graphene, which consists of a single layer of carbon atoms in a honeycomb arrangement. It is being examined with a view to potential use as a lubricating layer. Applications where a reduction of friction is desired include hard disks or moving components for satellites or space telescopes.
Previous studies have shown that a graphene ribbon can be moved across a gold surface with almost no friction. But if graphene is applied to a platinum surface, it has a significant impact on the measurable friction forces. Now, physicists from the University of Basel and Tel Aviv University have reported in the journal Nano Letters (“Velocity Dependence of Moiré Friction”) that, in this instance, the friction depends on the speed at which the tip of an atomic force microscope (AFM) is moved across the surface.
This finding is surprising because friction does not depend on speed according to Coulomb’s law, which applies in the macro world.
In conjunction with the platinum substrate, graphene no longer forms only the hexagonal honeycomb pattern of carbon atoms and instead forms superstructures known as Moiré superlattices. The surface is then no longer completely flat and exhibits a certain degree of roughness.
“If we move the AFM tip across this slightly corrugated surface at low speed, we measure a weak and almost constant frictional force,” explains Professor Ernst Meyer from the Swiss Nanoscience Institute and the Department of Physics at Basel University. “Above a certain threshold, however, the friction then increases with the speed of the AFM tip,” adds first author Dr. Yiming Song. “The larger the Moiré superstructure, the lower the threshold at which the friction becomes speed-dependent.”
The researchers found that there is greater resistance at the ridges of the Moiré superstructures during the movement of the tip. These ridges undergo elastic deformation due to the pushing tip before relaxing again when the pressure is sufficiently high. This effect results in greater frictional forces that increase with the speed of the tip. Simulations and an analytical model confirm the experimental findings obtained by this international team of researchers.
Image – The friction between the tip of an atomic force microscope and the Moiré superstructures depends on the speed at which the tip is moved across the surface. Courtesy of University of Basel.
************
For more information:
