This combines MBE growth, focused ion beam lithography, and hydrogen radical cleaning within one complete ultra high vacuum system.
Polypropylene can be made auxetic by compacting ultra high molecular weight PP powder, with a particle size of 30 to 120 microns.
The fibers are made from ultra high molecular weight polyethylene with an extremely high molecular mass.
The sample preparation and the measurements were done in ultra high vacuum.
Pumps with Ultra-High Heel - You might have to practice walking in them for awhile first, but everyone is wearing pumps with the highest heel they can stand and walk around in.