When the particle diameter reaches the nanometer level, they will have some strange or abnormal physical and chemical characteristics that traditional materials do not have, such as: copper that was originally conductive will not be conductive when it reaches a certain nanometer limit; the original insulating two Silicon oxide, etc., begins to conduct electricity at a certain nanometer limit. Recently, researchers at the Massachusetts Institute of Technology have discovered a new phenomenon of nano-silver particles: these silver particles are shaped like water droplets and can change their shape arbitrarily, but the interior can always maintain a perfect and stable crystal form.
The pure silver particles used in the experiments were less than 10 nanometers in diameter, less than one thousandth of human hair. The researchers observed through transmission electron microscopy that although the appearance of these metal nanoparticles seemed to be fluid, only the outermost part was moving at all times, and this part was only one or two atoms thick. These atoms move on the surface of the nanoparticle, and then fade away, while inside the nanoparticle, the atoms are arranged neatly and linearly.
This phenomenon of silver nanoparticles can be observed at normal temperature, and this deformation is still elastic. When the pressure is released, the material will return to its original shape.