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首页> 外文期刊>Applied optics >Experimental study of nonequilibrium fluctuations during free diffusion in nanocolloids using microscopic techniques
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Experimental study of nonequilibrium fluctuations during free diffusion in nanocolloids using microscopic techniques

机译：纳米技术在纳米胶体自由扩散过程中非平衡波动的实验研究

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摘要

We report quantitative experimental results regarding concentration fluctuations based on a small-angle light-scattering setup. A shadowgraph technique was used to record concentration fluctuations in a free-diffusion cell filled with colloids. Our experimental setup includes an objective attached to the CCD camera to increase the field of view. We performed two separate experiments, one with 20 nm gold and the other with 200 nm silica colloids, and extracted both the structure factors and the correlation time during the early stages of concentration fluctuations. The temporal evolution of fluctuations was also qualitatively investigated using recursive plots and spatial-temporal sections of fluctuating images. We found that the correlation time versus wavenumber for gold nanocolloids is concave shaped, whereas, for silica colloids, it is convex shaped. The difference in correlation time behavior is not only due to the size of the particle, but also to possible plasmonic interactions in gold colloids.
机译：我们报告基于小角度光散射设置有关浓度波动的定量实验结果。使用阴影图技术记录充满胶体的自由扩散池中的浓度波动。我们的实验装置包括一个连接到CCD摄像机的物镜，以增加视野。我们进行了两个单独的实验，一个实验用20 nm金，另一个实验用200 nm硅胶，提取了浓度波动早期的结构因子和相关时间。还使用递归图和波动图像的时空剖面定性研究了波动的时间演变。我们发现金纳米胶体的时间与波数的相关时间是凹形的，而对于二氧化硅胶体，它是凸形的。相关时间行为的差异不仅是由于粒子的大小，还在于金胶体中可能的等离子体相互作用。

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