Nano-sized Fe3O4 particles with single grain domain can exhibit superparamagnetic behavior at temperature higher than the blocking temperature. By introducing magnetic properties of Fe3O4 nanoparticles into polymer fibers, magnetic composite fibers with light-weight and ease-of-use can be realized. Using dry-jet-wet fiber spinning technology, we have successfully fabricated iron oxide/polyacrylonitrile (Fe3O4/PAN) composite fibers with 10wt% nanoparticle in the polymer matrix. Composite fiber with a diameter as small as 15 �m can achieve tensile strength and tensile modulus values as high as 630 MPa and 16 GPa, respectively. Superparamagnetic properties of Fe3O4 nanoparticles were preserved in the composite fibers with saturation magnetization at 80 emu/g and coercivity of 165 gauss. These new magnetic fibers can bring promising application such as actuator, inductor, microwave-absorption, ferromagnetic resonance heating, and electromagnetic interference shielding.

High-strength superparamagnetic composite fibers

247th National Meeting (2014)

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