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首页> 外文期刊>Materials science & engineering >Phosphate-based glass fiber vs. bulk glass: Change in fiber optical response to probe in vitro glass reactivity
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Phosphate-based glass fiber vs. bulk glass: Change in fiber optical response to probe in vitro glass reactivity

机译：磷酸盐基玻璃纤维与散装玻璃的关系：改变光纤光学响应以探测体外玻璃反应性

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摘要

This paper investigates the effect of fiber drawing on the thermal and structural properties as well as on the glass reactivity of a phosphate glass in tris(hydroxymethyl)aminomethane-buffered (TRIS) solution and simulated body fluid (SBF). The changes induced in the thermal properties suggest that the fiber drawing process leads to a weakening and probable re-orientation of the P- O - P bonds. Whereas the fiber drawing did not significantly impact the release of P and Ca, an increase in the release of Na into the solution was noticed. This was probably due to small structural reorientations occurring during the fiber drawing process and to a slight diffusion of Na to the fiber surface. Both the powders from the bulk and the glass fibers formed a Ca-P surface layer when immersed in SBF and TRIS. The layer thickness was higher in the calcium and phosphate supersaturated SBF than in TRIS. This paper for the first time presents the in vitro reactivity and optical response of a phosphate-based bio-active glass (PBG) fiber when immersed in SBF. The light intensity remained constant for the first 48 h after which a decrease with three distinct slopes was observed: the first decrease between 48 and 200 h of immersion could be correlated to the formation of the Ca-P layer at the fiber surface. After this a faster decrease in light transmission was observed from 200 to ～425 h in SBF. SEM analysis suggested that after 200 h, the surface of the fiber was fully covered by a thin Ca-P layer which is likely to scatter light For immersion times longer than ～425 h, the thickness of the Ca-P layer increased and thus acted as a barrier to the dissolution process limiting further reduction in light transmission. The tracking of light transmission through the PBG fiber allowed monitoring of the fiber dissolution in vitro. These results are essential in developing new bioactive fiber sensors that can be used to monitor bioresponse in situ.
机译：本文研究了纤维拉伸对三（羟甲基）氨基甲烷缓冲（TRIS）溶液和模拟体液（SBF）中磷酸盐玻璃的热和结构性能以及玻璃反应性的影响。热性能中引起的变化表明，纤维拉伸过程会导致P-O-P键的弱化和可能的重新取向。尽管纤维拉伸对P和Ca的释放没有显着影响，但注意到Na向溶液中的释放增加。这可能是由于在纤维拉伸过程中发生了较小的结构重新定向，以及Na轻微扩散至纤维表面。当浸入SBF和TRIS中时，来自散装粉末和玻璃纤维的粉末均形成Ca-P表面层。钙和磷酸盐过饱和的SBF中的层厚比TRIS中的高。本文首次介绍了浸入SBF中的磷酸盐基生物活性玻璃（PBG）纤维的体外反应性和光学响应。在开始的48小时内，光强度保持恒定，此后观察到以三个不同的斜率降低：浸入48至200 h之间的首次降低可能与在纤维表面形成Ca-P层有关。此后，在SBF中观察到光透射从200到425h更快地下降。扫描电镜分析表明，在200 h后，纤维表面被一层薄薄的Ca-P层完全覆盖，该层很可能会散射光。浸泡时间长于〜425 h时，Ca-P层的厚度增加并起作用。作为溶解过程的障碍，限制了透光率的进一步降低。跟踪通过PBG光纤的光传输可以在体外监视光纤的溶解情况。这些结果对于开发可用于现场监测生物反应的新型生物活性纤维传感器至关重要。

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  • 来源
    《Materials science & engineering》 |2014年第4期|251-257|共7页
  • 作者

    J. Massera; I. Ahmed; L. Petit; V. Aallos; L. Hupa;

  • 作者单位

    Process Chemistry Centre, Abo Akademi University, Biskopsgatan 8, FI-20500 Turku, Finland;

    Division of Materials, Mechanics and Structures, Faculty of Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, UK;

    nLIGHT Corporation, Sorronrinne 9, FI-08500 Lohja, Finland;

    nLIGHT Corporation, Sorronrinne 9, FI-08500 Lohja, Finland;

    Process Chemistry Centre, Abo Akademi University, Biskopsgatan 8, FI-20500 Turku, Finland;

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  • 正文语种 eng
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  • 关键词

    Phosphate-based glass; Fiber; Bioactive glass; Optical properties;

    机译：磷酸盐基玻璃;纤维;生物活性玻璃光学性质;

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