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Long α-Fe 2 O 3 hollow fibers have been prepared through a facile sol–gel combined co-electrospinning technique using ferric citrate as precursor, and α-Fe and γ-Fe 2 O 3 hollow fibers have been obtained by reduction and reoxidation at different conditions. The outer diameter of the as-prepared hollow fibers is 0.5–5 μm with wall thickness of 200–800 nm. The obtained...
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