Penn Engineers Develop Ultrathin, Ultralight 'Nanocardboard'
[A] team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square centimeter of nanocardboard weighs less than a thousandth of a gram and can spring back into shape after being bent in half.
Nanocardboard is made out of an aluminum oxide film with a thickness of tens of nanometers, forming a hollow plate with a height of tens of microns. Its sandwich structure, similar to that of corrugated cardboard, makes it more than ten thousand times as stiff as a solid plate of the same mass.
Nanocardboard's stiffness-to-weight ratio makes it ideal for aerospace and microrobotic applications, where every gram counts. In addition to unprecedented mechanical properties, nanocardboard is a supreme thermal insulator, as it mostly consists of empty space.
Future work will explore an intriguing phenomenon that results from a combination of properties: shining a light on a piece of nanocardboard allows it to levitate. Heat from the light creates a difference in temperatures between the two sides of the plate, which pushes a current of air molecules out through the bottom.
Nanocardboard as a nanoscale analog of hollow sandwich plates (open, DOI: 10.1038/s41467-018-06818-6) (DX)
(Score: 0) by Anonymous Coward on Friday November 09 2018, @06:35PM
Appearance on 'Ancient Aliens' and/or 'Alien Files' and/or 'UFO Hunters' in 3...2...1...
Nah, Aliens mate, Aliens....secret reverse engineered Roswell Tech finally revealed...with lame cover story..
(Beer, I need beer, lots of beer.....)