  Direct near field electrospinning is used to produce very long helical
polystyrene microfibers in water. The pitch length of helices can be controlled
by changing the applied voltage, allowing to produce both micro springs and
microchannels. Using a novel high frequency variable voltage electrospinning
method we found the helix formation speed and compared the experimental
buckling frequency to theoretical expressions for viscous and elastic buckling.
Finally we showed that the newmethod can be used to produce new periodic micro
and nano structures.
