▁method ▁ens ures ▁that ▁no ▁sol vent ▁can ▁be ▁carried ▁over ▁into ▁the ▁final ▁product . ▁ ▁Process ▁When ▁a ▁sufficiently ▁high ▁voltage ▁is ▁applied ▁to ▁a ▁liquid ▁dro ple t , ▁the ▁body ▁of ▁the ▁liquid ▁becomes ▁charged , ▁and ▁electro static ▁rep ulsion ▁counter act s ▁the ▁surface ▁t ension ▁and ▁the ▁dro ple t ▁is ▁stretch ed ; ▁at ▁a ▁critical ▁point ▁a ▁stream ▁of ▁liquid ▁er u pts ▁from ▁the ▁surface . ▁This ▁point ▁of ▁er u ption ▁is ▁known ▁as ▁the ▁Taylor ▁cone . ▁If ▁the ▁mole cular ▁coh es ion ▁of ▁the ▁liquid ▁is ▁sufficiently ▁high , ▁stream ▁break up ▁does ▁not ▁occur ▁( if ▁it ▁does , ▁dro ple ts ▁are ▁electro sp rayed ) ▁and ▁a ▁charged ▁liquid ▁jet ▁is ▁formed . ▁ ▁As ▁the ▁jet ▁d ries ▁in ▁flight , ▁the ▁mode ▁of ▁current ▁flow ▁changes ▁from ▁o hm ic ▁to ▁con ve ct ive ▁as ▁the ▁charge ▁migr ates ▁to ▁the ▁surface ▁of ▁the ▁fi ber . ▁The ▁jet ▁is ▁then ▁el ong ated ▁by ▁a ▁wh ipping ▁process ▁caused ▁by ▁electro static ▁rep ulsion ▁initi ated ▁at ▁small ▁b ends ▁in ▁the ▁fi ber , ▁until ▁it ▁is ▁finally ▁depos ited ▁on ▁the ▁ground ed ▁collect or . ▁The ▁el ong ation ▁and ▁thin ning ▁of ▁the ▁fi ber ▁resulting ▁from ▁this ▁b ending ▁inst ability ▁leads ▁to ▁the ▁formation ▁of ▁uniform ▁fib ers ▁with ▁nan ometer - scale ▁diam eters . ▁ ▁Param eters ▁ ▁M ole cular ▁weight , ▁mole