The synthesis and the characterization of three kinds of labeled silica nanoparticles were performed. Three different labeling strategies were investigated: fluorescent organic molecule (FITC) embedded in silica matrix, heavy metal core (Ag(0)) and radioactive core ((110m)Ag) surrounded by a silica shell. The main properties and the suitability of each kind of labeled nanoparticle in terms of size, surface properties, stability, detection limits, and cost were determined and compared regarding its use for transport studies. Fluorescent labeling was found the most convenient and the cheapest, but the best detection limits were reached with chemical (Ag(0)) and radio-labeled ((110m)Ag) nanoparticles, which also allowed nondestructive quantifications. This work showed that the choice of labeled nanoparticles as surrogates of natural colloids or manufactured nanoparticles strongly depends on the experimental conditions, especially the concentration and amount required, the composition of the effluent, and the timescale of the experiment.

译文

进行了三种标记二氧化硅纳米颗粒的合成和表征。研究了三种不同的标记策略: 嵌入二氧化硅基质中的荧光有机分子 (FITC),被二氧化硅壳包围的重金属核 (Ag(0)) 和放射性核 ((110m)Ag)。每种标记的纳米颗粒在尺寸方面的主要性质和适用性,确定了表面性质、稳定性、检测限和成本,并比较了其在运输研究中的用途。荧光标记被发现是最方便和最便宜的,但化学 (Ag(0)) 和放射性标记 ((110m)Ag) 纳米颗粒达到了最佳检测限,这也允许非破坏性定量。这项工作表明,选择标记的纳米颗粒作为天然胶体或制造的纳米颗粒的替代物在很大程度上取决于实验条件,尤其是所需的浓度和量,流出物的组成以及实验的时间尺度。

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