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(Color online) Process flow for the fabrication of partially embedded VACNFs inside a polyurethane elastomer: (a) PECVD grown VACNFs on a silicon substrate is glued to a Petri dish with the fibers facing up. (b) The liquid polyurethane is poured onto the sample under vacuum. (c) The polyurethane is peeled off from the silicon substrate upon curing, transferring the VACNFs inside the polyurethane. (d) Around thick polyurethane is selectively etched away from the surface using oxygen plasma leaving the VACNFs partially released.
(Color online) (a) Photo and (b) scanning electron microscope images of the partially embedded (around length of nanofibers is released outside) vertically aligned carbon nanofibers ( length and diameter) with a flexible polyurethane backing.
(Color online) Experimental friction and effective friction coefficient results obtained from the partially embedded vertically aligned carbon nanofiber sample: (a) for varying preloads at three different nanofiber locations on the same sample and (b) for varying cycles on the same nanofiber location for each preload at 5 and preloads. All experiments were performed with a diameter glass hemisphere at a constant speed of .
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