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The organic gel-thermal reduction process was successfully used for the preparation of magnetic metal Ni,Fe,Fe-Ni fine fibers from raw materials of citric acid or lactic acid and metal salts.Ni, Fe and Fe-Ni fine fibers synthesized were featured with diameters of arotuld 1μm and lengths of as long as 2 m for Ni fibers,0.5 m for iron fibers,1 m for Fe-Ni fibers.The structure,thermal decomposition process and morphologies of the gel precursors and fibers derived from thermal reduction of these gel precursors were characterized by FTIR,XRD,TG/DSC and SEM,respectively.The gel spinnability largely depends on molecular structures of metal-carboxylate complexes formed in the gel.It is reasoned that these gels consist of linear-type structural molecules[(C_6H_6O_7)Ni]_n or[(C_6H_5O_7)_2Ni_3]for the nickel citrate gel,[(C_3H_6O_3)_3Fe]for the ferric lactate gel,[(C_6H_5O_7)_5(NiFe)_3]for the iron-nickel citrate gel respectively and the gels obtain showed a good spinning performance.
The organic gel-thermal reduction process was successfully used for the preparation of magnetic metal Ni, Fe, Fe-Ni fine fibers from raw materials of citric acid or lactic acid and metal salts. Ni, Fe and Fe-Ni fine- with diameters of 1 μm and lengths of as long as 2 m for Ni fibers, 0.5 m for iron fibers, 1 m for Fe-Ni fibers. The structure, thermal decomposition process and morphologies of the gel precursors and fibers derived from thermal reduction of These gel precursors were characterized by FTIR, XRD, TG / DSC and SEM, respectively. The gel spinnability largely depends on molecular structures of metal-carboxylate complexes formed in the gel. It is reasoned that these gels consist of linear-type structural molecules [ (C_6H_6O_7) Ni] _n or [(C_6H_5O_7) _2Ni_3] for the nickel citrate gel, [(C_3H_6O_3) _3Fe] for the ferric lactate gel, [(C_6H_5O_7) _5 (NiFe) _3] the gels obtain showed a good spinning performance.