cular - weight ▁distribution ▁and ▁architecture ▁( branch ed , ▁linear ▁etc .) ▁of ▁the ▁polym er ▁ ▁Solution ▁properties ▁( vis cos ity , ▁conduct ivity ▁and ▁surface ▁t ension ) ▁ ▁Electric ▁potential , ▁flow ▁rate ▁and ▁concentration ▁▁ ▁Dist ance ▁between ▁the ▁cap ill ary ▁and ▁collection ▁screen ▁ ▁Amb ient ▁parameters ▁( temper ature , ▁hum id ity ▁and ▁air ▁velocity ▁in ▁the ▁chamber ) ▁▁ ▁Mot ion ▁and ▁size ▁of ▁target ▁screen ▁( collect or ) ▁ ▁Need le ▁gauge ▁ ▁Appar atus ▁and ▁range ▁The ▁standard ▁labor atory ▁setup ▁for ▁electro sp in ning ▁consists ▁of ▁a ▁sp inner et ▁( typ ically ▁a ▁hyp od erm ic ▁s yr inge ▁need le ) ▁connected ▁to ▁a ▁high - vol t age ▁( 5 ▁to ▁ 5 0   k V ) ▁direct ▁current ▁power ▁supply , ▁a ▁s yr inge ▁p ump , ▁and ▁a ▁ground ed ▁collect or . ▁ ▁A ▁polym er ▁solution , ▁sol - gel , ▁partic ulate ▁susp ension ▁or ▁m elt ▁is ▁loaded ▁into ▁the ▁s yr inge ▁and ▁this ▁liquid ▁is ▁extr ud ed ▁from ▁the ▁need le ▁tip ▁at ▁a ▁constant ▁rate ▁by ▁a ▁s yr inge ▁p ump . ▁Alternatively , ▁the ▁dro ple t ▁at ▁the ▁tip ▁of ▁the ▁sp inner et ▁can ▁be ▁re pl en ished ▁by ▁feed ing ▁from ▁a ▁header ▁tank ▁providing ▁a ▁constant ▁feed ▁pressure . ▁This ▁constant ▁pressure ▁type ▁feed ▁works ▁better ▁for ▁lower ▁vis cos ity ▁feed stock s