A Nano-Cheese-Cutter to Directly Measure Interfacial Adhesion of
Freestanding Nano-Fibers   A novel nano-cheese-cutter is
fabricated to directly measure the adhesion between two
freestanding nano-fibers. A single electrospun fiber is attached
to the free end of an atomic force microscope (AFM) cantilever,
while a similar fiber is similarly prepared on a mica substrate
in an orthogonal direction. External load is applied to deform
the two fibers into complementary V-shapes, and the force
measurement allows the elastic modulus to be determined. At a
critical tensile load,