. ▁ ▁S cal ing - up ▁possibilities ▁ ▁Mult ip lying ▁the ▁need les ▁ ▁Rot ating ▁roll er ▁electro sp in ning ▁ ▁W ire ▁electro sp in ning ▁ ▁B ubble ▁electro sp in ning ▁ ▁Ball ▁electro sp in ning ▁ ▁High ▁speed ▁electro sp in ning ▁ ▁Pl ate ▁edge ▁electro sp in ning ▁ ▁Bowl ▁electro sp in ning ▁ ▁H ollow ▁t ube ▁electro sp in ning ▁ ▁Rot ary ▁cone ▁electro sp in ning ▁ ▁Sp iral ▁co il ▁electro sp in ning ▁ ▁Elect rob low ing ▁ ▁Need le less ▁electro sp in ning ▁▁ ▁Altern ating ▁current ▁electro sp in ning ▁ ▁Other ▁techniques ▁Mod ification ▁of ▁the ▁sp inner et ▁and / or ▁the ▁type ▁of ▁solution ▁can ▁allow ▁for ▁the ▁creation ▁of ▁fib ers ▁with ▁unique ▁structures ▁and ▁properties . ▁Elect ro sp un ▁fib ers ▁can ▁adopt ▁a ▁por ous ▁or ▁core – shell ▁morph ology ▁depending ▁on ▁the ▁type ▁of ▁materials ▁being ▁sp un ▁as ▁well ▁as ▁the ▁ev ap oration ▁rates ▁and ▁mis ci b ility ▁for ▁the ▁sol vent s ▁involved . ▁For ▁techniques ▁which ▁involve ▁multiple ▁spin ning ▁flu ids , ▁the ▁general ▁criteria ▁for ▁the ▁creation ▁of ▁fib ers ▁depends ▁upon ▁the ▁sp inn ability ▁of ▁the ▁outer ▁solution . ▁This ▁opens ▁up ▁the ▁possibility ▁of ▁creating ▁composite ▁fib ers ▁which ▁can ▁function ▁as ▁drug ▁delivery ▁systems ▁or ▁possess ▁the ▁ability ▁to ▁self - he al ▁upon ▁failure . ▁ ▁Co ax ial ▁electro