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首页> 外文期刊>Journal of Hazardous Materials >Visualization and analysis of nanoparticle transport and ageing in reactive porous media
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Visualization and analysis of nanoparticle transport and ageing in reactive porous media

机译：反应性多孔介质中纳米颗粒传输和老化的可视化和分析

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摘要

We present quasi-3D visualization and analysis of engineered nanoparticle (ENP) transport behavior in an experimental setup that uses a transmitted light imaging technique. A flow cell was packed with specially adapted, water-transparent, spherical polyacrylamide beads, which carry a negative surface charge representative of many natural environments. Ubiquitous, oppositely-charged ENPs - Au and Ag NPs - were synthesized and introduced into a flow cell subjected to a macroscopically uniform flow field via point source pulse injection, at three different flow rates. The negatively-charged ENPs behaved like a conservative tracer, in terms of spatio-temporal plume evolution. The positive AgNPs, however, displayed a decrease in their initially strong tendency to attach to the oppositely-charged porous medium. As a result, immobilization of the positive AgNPs was spatially and temporally limited to the vicinity of the point of injection; beyond this region, the AgNPs were mobile and effluent contained AgNPs with hydrodynamic diameters significantly larger than those of the injected AgNPs. This behavior is understood by dynamic light scattering and potential measurements, which showed aggregation processes and inversion in particle surface charge to occur during transport of the positive ENPs. These findings have broad implications for ENP mobility and reactivity in the environment. (C) 2015 Elsevier B.V. All rights reserved.
机译：我们在使用透射光成像技术的实验装置中，对准3D可视化和工程纳米颗粒（ENP）传输行为进行分析。流通池中装有经过特殊改造的透明水球形聚丙烯酰胺珠，这些珠带有负表面电荷，代表许多自然环境。合成了无处不在的，带相反电荷的ENP-Au和Ag NPs，并通过点源脉冲注入以三种不同的流速将其引入到经受宏观均匀流场的流通池中。带负电荷的ENP在时空羽流演化方面表现得像保守的示踪剂。但是，阳性AgNPs最初附着在带相反电荷的多孔介质上的强烈趋势有所降低。结果，阳性AgNPs的固定在空间和时间上都限于注射点附近。在该区域以外，AgNPs是可移动的，流出物中所含的AgNPs的流体力学直径明显大于注入的AgNPs。通过动态光散射和电势测量可以了解此行为，这表明聚集过程和正ENP传输过程中发生的颗粒表面电荷反转。这些发现对环境中的ENP流动性和反应性具有广泛的意义。 （C）2015 Elsevier B.V.保留所有权利。

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