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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Thermoluminescence as a probe in bioactivity studies; The case of 58S sol-gel bioactive glass
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Thermoluminescence as a probe in bioactivity studies; The case of 58S sol-gel bioactive glass

机译：热发光作为生物活性研究的探针; 58S溶胶-凝胶生物活性玻璃的情况

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摘要

The formation of a carbonated hydroxyapatite (HCAp) layer on the surface of bioactive materials is the main reaction that takes place upon their immersion in physiological fluids. To date, all techniques used for the identification of this HCAp formation are rather time consuming and not well suited to detailed and rapid monitoring of changes in the bioactivity response of the material. The aim of this work is to explore the possibility of using thermoluminescence (TL) for the discrimination between different bioactive responses in the case of the 58S bioactive glass. Results provided strong indications that the 110 °C TL peak of quartz can be used effectively in the study of the bioactive behaviour of 58S bioactive glass, since it is unambiguously present in all samples and does not require deconvolution analysis. Furthermore, the intensity of the 110 °C TL peak is proven to be very sensitive to the different bioactive responses, identifying the loss of silica which takes place at the first stages of the sequence. The discontinuities of the 110 °C TL peak intensity plot versus immersion time at 8 and 1440 min provide experimental indications regarding the timescale for both the beginning of amorphous CaP formation as well as the end of crystalline hydroxyl-apatite formation respectively, while the spike in the sensitization of the 110 °C TL peak, which was observed for immersion times ranging between 20 and 40 min, could be an experimental feature indicating the beginning of the crystalline HCAp formation.
机译：在生物活性材料表面上形成碳酸羟基磷灰石（HCAp）层是将其浸入生理液后发生的主要反应。迄今为止，用于鉴定这种HCAp形成的所有技术都相当耗时，并且不适合于详细而快速地监测材料的生物活性反应的变化。这项工作的目的是探索在58S生物活性玻璃的情况下使用热致发光（TL）区分不同生物活性反应的可能性。结果提供了有力的证据，表明石英的110°C TL峰可以有效地用于58S生物活性玻璃的生物活性研究，因为它明确存在于所有样品中，并且不需要进行去卷积分析。此外，已证明110°C TL峰的强度对不同的生物活性反应非常敏感，从而确定了在序列第一阶段发生的二氧化硅损失。 110°C TL峰强度图相对于8分钟和1440分钟浸入时间的不连续性提供了实验指示，分别涉及非晶CaP形成开始和结晶羟基磷灰石形成结束的时标，而浸泡时间在20至40分钟之间观察到的110°C TL峰的敏化可能是表明结晶HCAp形成开始的实验特征。

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