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C@FeNi3 core/shellstructuredmicrochainswerepreparedbya
simplehydrothermalmethod.Typically,1mmolFeCl2  4H2O, 3mmol
NiCl2  6H2O and1gpolyvinylalcohol(PVA)weredissolvedin75ml
ethyleneglycol.Then5mlN2H4 H2O (80%(v/v)) wasadded.The
mixedsolutionwasvigorouslystirredfor30min,andtransferredinto
a 100mlTeflon cupandsealedinastainlessautoclave.Theautoclave
wasputintoanovenandmaintainedat200 1C for12h,andthenwas
allowedtocooldownnaturallytoroomtemperature.Black fluffy
powderswereobtainedatthebottomofTeflon cup.The final products
weremagneticallyseparatedandwashedwithdistilledwaterand
ethanol forthreetimes,respectively.Theproductsweredriedinan
ovenat80 1C for12h.
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