Abstract Silicon oxycarbide (SiOC) fibers with different sub-micron-scaled sizes were fabricated through a spinning-aid-free electrospinning/sol-gel method. By controlling the acidity of the sol-gel system, precursor solutions with different viscosities were prepared and directly used for electrospinning. The effects of pH value on the molecular configuration of sol-gel derived precursors have been analyzed by solid-state nuclear magnetic resonances (SSNMR) test. The influence of precursors' configuration on the morphology of resulted fibers has also been investigated. Polysiloxane (PSO) precursors derived from a mild acidity (pH = 4) presented the optimal crosslinked configuration and yielded the finest bead-free SiOC fibers with an average diameter of 257 ± 3 nm. This spinning-aid-free electrospinning/sol-gel method could be potentially adapted to other metal alkoxide systems to fabricate a broader range of ceramic fibers.

中文翻译：

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通过无纺丝助剂静电纺丝/溶胶-凝胶法制备的坚固超细碳化硅纤维垫

摘要 通过无纺丝/溶胶-凝胶法制备了不同亚微米级尺寸的碳氧化硅（SiOC）纤维。通过控制溶胶-凝胶体系的酸度，制备了不同粘度的前驱体溶液并直接用于静电纺丝。已通过固态核磁共振 (SSNMR) 测试分析了 pH 值对溶胶-凝胶衍生前体分子构型的影响。还研究了前体配置对所得纤维形态的影响。源自弱酸性 (pH = 4) 的聚硅氧烷 (PSO) 前体呈现最佳交联构型，并产生平均直径为 257 ± 3 nm 的最好的无珠SiOC 纤维。