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Impact of temperature on the physicochemical, structural and biological features of copper-silica nanocomposites

机译：温度对铜硅纳米复合材料理化，结构和生物学特性的影响

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Classical wet chemical synthesis was used to fabricate a hybrid composite that contained copper nanoparticles (average size similar to 1 nm), which were embedded into a silicon oxide carrier. The structural and chemical alternations in the copper-functionalized silica were investigated in systems that were sintered at 573 K, 873 K, 1173 K, and 1473 K. A general trend, which was associated with the transformation of metallic copper with a cubic structure into copper(II) oxide with a monoclinic structure in the heat-treated systems, was found. XPS and FTIR spectroscopies also revealed the presence of copper(I) oxide, which formed a shell around the CuO. SEM and TEM showed gradual densification of the hybrid system at ever higher sintering temperatures, which corresponded with the gradual copper agglomeration. A temperature of 873 K was determined to be the temperature at which amorphous silica was transformed into cristoballite and tridymite, as well as the formation of a bulk-like copper structure. In relation to the physicochemical and structural data, high antimicrobial features that had a relatively low toxicity effect on the normal human fibroblasts (NHDF) below 250 mg/L was found for the initial copper-silica composite and the samples that were sintered at 573 K. In turn, a significant decrease in the biological impact was observed in the samples that were sintered at temperatures above 573 K. As a result, the paper discusses the model of structural modifications in copper-silica nanocomposite concerning their biological impact that was developed.
机译：经典的湿化学合成用于制造杂化复合材料，其中包含铜纳米颗粒（平均尺寸类似于1 nm），这些纳米颗粒被嵌入到氧化硅载体中。在以573 K，873 K，1173 K和1473 K烧结的系统中，研究了铜官能化二氧化硅的结构和化学变化。总体趋势是与具有立方结构的金属铜向发现在热处理系统中具有单斜晶结构的氧化铜（II）。 XPS和FTIR光谱仪还显示存在氧化铜（I），氧化铜在CuO周围形成壳。 SEM和TEM显示，在更高的烧结温度下，杂化体系逐渐致密化，这与逐渐的铜团聚相对应。 873 K的温度被确定为无定形硅石转变为方石英和鳞石英以及形成块状铜结构的温度。关于理化和结构数据，对于初始铜-二氧化硅复合材料和在573 K烧结的样品，发现对250 mg / L以下的正常人成纤维细胞（NHDF）毒性较低的高抗菌特性反过来，在高于573 K的温度下烧结的样品中观察到了生物学影响的显着降低。结果，本文讨论了铜-二氧化硅纳米复合材料中结构修饰的模型，并探讨了它们的生物学影响。

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