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Novel magnetic tubular carbon nanofibers (MTCFs) are prepared through the combination technique of hypercrosslinking, control extraction, and carbonization. The diameter of MTCFs is mainly concentrated between 90 and 120 nm, and the average tube diameter is about 30 nm. A trace amount of Fe3O4 exists inside the MTCFs with a particle size of 3 nm, which is formed by in situ conversion of the catalyst...
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