MorganL4 said:
Yay, shameless plug at the end
But on a more serious note... This actually seems really cool... could they make it into a cloth? If so that could be great for the military, having bullet proof sleeves and pants, and not just something that will protect the torso. Fingers crossed on that front...
The problem with that idea is that even if a bullet can't pass through something, it still imparts a huge amount of force on impact. There are already soft body armors that exist, but while they're very good at stopping bullets, they aren't very good at protecting people from the blunt force from the bullet, because when the bullet hits the soft surface most of the bullet's energy is absorbed in a very small area of the vest, and therefore still goes directly into the body, very often causing broken bones and internal bleeding. That's why when people wear soft body armor they almost always wear what's known as a "trauma plate" (which is a rectangular plate made of metal or ceramic) over the soft body armor, in order to reduce the blunt force trauma caused by the bullet hitting their body armor.
So if you imagine bullet proof clothing made out of nanofibers, people would still be heavily injured by the bullets. Sure, the bullets wouldn't actually enter the person's body, but all of the force of the bullet would still be imparted to that body causing heavy blunt force trauma, breaking bones and causing internal bleeding. To have effective body armor you need the bullet to hit a hard surface to more evenly distribute the force.
Basically the use of these kinds of nano-fibers in creating body armor wouldn't be creating body armor that has more coverage, but rather creating body armor that is lighter and easier to move in.