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In situ chemical and physical reduction of copper on bioactive glass surface

机译：原位化学和物理还原生物活性玻璃表面上的铜

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In this work silica-based bioactive glass powders were doped with Cu++ ions by means of ion-exchange process and subsequently they were exposed to different chemical (tannic acid, ascorbic acid and NaOH) and physical processes (UV irradiation, thermal treatment in air or argon atmosphere) to promote the in situ reduction of Cu++ ions to Cu+ or Cu-0. The obtained glasses were investigated by means of structural (X-Ray diffraction - XRD), morphological and compositional analyses (scanning-transmission electron microscopy equipped with energy dispersive spectroscopy (FESEM/STEM-EDS); moreover, glasses were subjected to in vitro bioactivity test in simulated body fluid up to 14 days to investigate the influence of the performed chemical and physical treatments on glass bioactivity. At the end of incubation time glasses were analyzed by means of FESEM-EDS and Fourier transformation infrared spectroscopy (FT-IR). The obtained results evidenced that, in general, the chemical treatments are useful to induce the formation of Cu-0, while thermal treatment induce the nucleation of CuO (in air) or Cu2O (in argon). All samples maintained a bioactive behavior. M least, preliminary antibacterial effect evaluation by inhibition halo WA evidenced that samples containing free Cu++ ions or Cu-0 nanoparticles possess the best antibacterial effect.
机译：在这项工作中，基于硅的生物活性玻璃粉通过离子交换工艺掺杂了Cu ++离子，随后将其暴露于不同的化学物质（鞣酸，抗坏血酸和NaOH）和物理过程（紫外线照射，空气中热处理或氩气气氛）以促进将Cu ++离子原位还原为Cu +或Cu-0。通过结构（X射线衍射-XRD），形态和组成分析（配备能谱的扫描透射电子显微镜（FESEM / STEM-EDS））研究所得玻璃；此外，使玻璃具有体外生物活性。实验在长达14天的模拟体液中进行，以研究所进行的化学和物理处理对玻璃生物活性的影响；在培养结束时，通过FESEM-EDS和傅立叶变换红外光谱（FT-IR）分析玻璃。所得结果表明，一般而言，化学处理可用于诱导Cu-0的形成，而热处理可诱导CuO（在空气中）或Cu2O（在氩气中）成核，所有样品均保持生物活性。至少，通过抑制卤素WA进行的初步抗菌效果评估表明，含有游离Cu ++离子或Cu-0纳米颗粒的样品具有最佳的抗菌效果。

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