© Copyright AM 2022. All rights reserved.In nature the phenomenon of friction can be an enemy or a blessing.In general "friction" is the name given to the force that opposes displacement between two surfaces.If this phenomenon did not exist, the brakes of cars, trains and bicycles would not work and it would be impossible to drive.Also the tires of the cars would not adhere to the ground and it would be impossible to turn or brake.In reality, friction is a serious enemy in mechanical elements and is a source of failures, as well as a decrease in the life of many machinery, from skateboards and airplanes to entire assembly lines.Many readers will remember high school physics classes where, to determine the coefficient of static friction between two objects (say, a wooden board and a cardboard box), the box is placed on the board and one side of the box is slowly raised. the board until the cardboard box begins to slide.The tangent of the angle of the board at that instant gives us the coefficient of friction between the wood and the cardboard.Oh!… Obtaining this result excites any student!Researchers from the University of Pittsburgh in the United States have just reported an interesting article (see: X. Wang, et al., “Atomic-scale friction between single-asperity contacts unveiled through in situ transmission electron microscopy”. Nature Nanotechnology, 2022; 17 (7): 737) in which they study the phenomenon of friction at the atomic level, which is where it really originates, where they show the friction in real time using an electron microscope.In an interview about their work, the authors commented as follows: “Until now, no one had been able to really see the friction process on an atomic scale with a clear interface, therefore, the relationship between the friction mechanisms and the interface had not been well understood. fully understood.Whereas in our study we are able to see the atomic displacement and dynamical strain that has only previously been calculated using computational simulations."For the first time, there is a visualization of the phenomenon of friction on an atomic scale.Using the electron microscope it was possible to see the movement of atoms across surfaces making contact as they moved.The experimental results were compared with the computational simulations determining precisely the forces that come into play.Tungsten surfaces were used in this experiment.One of the most important conclusions is that no matter how smooth or clean a surface is, friction at the atomic level is unavoidable.However, this study also provides keys that will allow the design of better lubricants necessary to minimize friction and wear between mechanical parts, which will increase the useful life of various mechanisms.It is interesting that since ancient Greece the phenomenon of friction had caused a lot of interest, in fact, Themistio in the year 350 AD, discovered that "it is easier to maintain the movement of a body than to start its movement from rest".This is the difference between the so-called static friction and dynamic friction, which they already knew.Tomorrow and Sunday, 150 morenistas from Guanajuato will not be able to make a "bridge", since they will travel to Mexico City to have their National Congress in which the national councilors and some portfolios for the National Executive Committee headed by Mario Delgado Carrillo will be defined.True sovereignty is achieved with prosperity and this requires open markets.Those who defended Alejandro Moreno were left as a joke, Marko Cortés and Jesús Zambrano ended up being seen as a resounding failure among their militancy.Enter the Circle to get exclusive benefits© Copyright AM 2022. All rights reserved.