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SiO 2 hollow nanostructured fibers with hierarchical walls have been fabricated by the sol–gel combined two-capillary spinneret co-electrospinning technique using triblock copolymer as the porous directing agent. The as-prepared SiO 2 hollow nanostructured fibers were as long as 10 cm with the outer diameter of 400–600 nm and shell thickness of 50–200 nm, and their walls contained...
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