Bioactive fibers have become increasingly prevalent for applications in optical sensing and as reinforcement in fully biodegradable devices. However, the typical bioactive glass fibers drawn from silicate glasses have poor mechanical properties. Here, we present our latest study on the development of new bioactive single‐core (SC) borophosphate fiber with the composition (in mol%) 47.5P₂O₅‐20CaO‐20SrO‐10Na₂O‐2.5B₂O₃ and of core‐clad (CC) borophosphate fiber, the composition (in mol%) of the clad and the core being 47.5P₂O₅‐20CaO‐20SrO‐10Na₂O‐2.5B₂O₃ and 0.025CeO₂‐0.975(47.5P₂O₅‐20CaO‐20SrO‐10Na₂O‐2.5B₂O₃), respectively. We show that the immersion in aqueous solutions such as Tris(hydroxymethyl)aminomethane (TRIS) increases first the mechanical properties of the fibers due to the early congruent glass dissolution and so due to the reduction in the density of surface flaws. However, for long immersion in TRIS or in Simulated Body Fluid (SBF), the mechanical properties decrease due to the precipitation of a reactive calcium‐phosphate layer at the surface of the fibers. Especially when immersed for a long time in SBF, the fibers become too fragile to allow one to measure their mechanical properties. Nonetheless, we clearly show in this study that the newly developed fibers are promising materials for reinforcing composite and/or as biosensors as these fibers still possess sufficiently high mechanical properties after immersion for significant time in SBF and/or TRIS.

中文翻译：

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浸入水溶液中时，生物活性硼磷酸盐纤维的机械性能变化

生物活性纤维已越来越普遍地用于光学传感以及作为可完全生物降解的设备中的增强材料。然而，由硅酸盐玻璃制成的典型的生物活性玻璃纤维的机械性能较差。这里，我们提出我们的最新研究的新的生物活性的单核（SC）的硼纤维的发展与组合物（以摩尔％）47.5P ₂ ø ₅ -20CaO-20SrO-10nA的₂ -O-2.5B ₂ ö ₃和包层的芯-包层（CC）的硼纤维，该组合物（以摩尔％）和芯体47.5P ₂ ö ₅ -20CaO-20SrO-10nA的₂ -O-2.5B ₂ ö ₃和0.025CeO ₂‐0.975（47.5P ₂ O ₅ ‐20CaO‐20SrO‐10Na ₂ O‐2.5B ₂ O ₃）， 分别。我们表明，浸入水溶液中（如Tris（羟甲基）氨基甲烷（TRIS））首先会增加纤维的机械性能，这是由于早期的全玻璃溶解所致，以及表面缺陷密度的降低所致。但是，如果长时间浸泡在TRIS或模拟体液（SBF）中，则由于纤维表面上的反应性磷酸钙层的沉淀，机械性能会下降。特别是当长时间浸泡在SBF中时，纤维变得太脆弱，无法测量其机械性能。尽管如此，