Researchers at the University of Wisconsin-Madison have developed a lightweight foam made from carbon nanotubes that can absorb the kinetic energy caused by an impact nearly 30 times better than current helmet liners used in the US military. The foam has the potential to significantly reduce the likelihood of concussions in military personnel and sportspeople. Traumatic brain injury (TBI) is a major cause of disability and death among sportspeople and military vets, and the majority of TBIs are associated with oblique impacts that subject the brain to both linear and rotational kinetic energy forces. The unique deformation mechanism of the foam allows it to accommodate large shear strains and manage rotational kinetic energy, making it suitable for use in modern protective helmets. The foam also exhibits outstanding thermal conductivity and diffusivity, making it suitable for use in electronic packaging and systems. Published in the journal Experimental Mechanics.
https://newatlas.com/medical/carbon-nanotube-foam-helmet-liner-concussion/