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Initial jet usually has a large primary droplet hanging at flying end before the onset of effective electrospinning.
The primary droplet is undesired as its diameter is several orders of magnitude higher than that of electrospun nanofibres.
A new method is used to derive micro-scaled initial jet and fine primary droplet under applied small-aperture needle by
utilizing low solution flow rate and pre-applied electric potential before the extrusion of polymeric solution out of the
needle. Small-aperture needle reduces the base of conical pendant, while low solution flow rate prevents a fluidic inrush
into conical pendant. The pre-applied electric potential preforms a miniature liquid cone, as an origin of initial jet, within
the needle. The conic preformation reduces the formation time of Taylor cone in order to escape from a swollen Taylor
cone under a continuous inflow of polymeric solution. The miniature conical pendant grows so acute that it emits fine
primary droplet rapidly from its tip with accumulated ions. Carrying primary droplet, thin initial jet experiences axial
elongation and circumferential rotation in the space.