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arXiv 2107.06247cond-mat.mes-hall
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单粒子质量光度法测量溶液中金纳米粒子的粒径分布

Size distributions of gold nanoparticles in solution measured by single-particle mass photometry

Luke Melo, Angus Hui, Matt Kowal, Eric Boateng, Zahra Poursorkh, Edène Rocheron, Jake Wong, Ashton Christy, Edward Grant

摘要:

纳米粒子的特殊应用通常需要溶液中特定的、良好表征的粒度分布。但是,这种特性很难测量。高通量方法,如动态光散射,检测溶液中的纳米颗粒,其效率与直径的六次方成比例。这降低了必须跨越一定范围的颗粒尺寸的任何测定的准确度。因此,广泛分布的系统的准确分类需要非常大量的测量。质量过滤颗粒感测技术提供更好的动态范围,但劳动密集型,因此具有低吞吐量。在纳米技术的许多领域的进步需要更快,更低成本,更准确的测量粒度分布,特别是直径小于20纳米。在这里,我们提出了一个量身定制的干涉显微镜系统,结合高速图像处理策略,优化了实时颗粒跟踪,确定准确的尺寸分布在标称5,10和15纳米胶体金纳米颗粒系统,通过自动检测和分类数以千计的单颗粒从溶液中采样的速率高达4,000颗粒每分钟。我们证明了这种方法通过感测的不可逆结合的金纳米粒子的聚-D-赖氨酸功能化盖玻片。作为时间和质量的函数,TEM校准的单粒子信号的变化,显示出明显的证据扩散限制运输的存在,最影响较大的颗粒在溶液中。

英文摘要:

Specialized applications of nanoparticles often call for particular, well-characterized particle size distributions in solution. But, this property can prove difficult to measure. High-throughput methods, such as dynamic light scattering, detect nanoparticles in solution with an efficiency that scales with diameter to the sixth power. This diminishes the accuracy of any determination that must span a range of particle sizes. The accurate classification of broadly distributed systems thus requires very large numbers of measurements. Mass-filtered particle-sensing techniques offer a better dynamic range, but are labor-intensive and so have low throughput. Progress in many areas of nanotechnology requires a faster, lower-cost, and more accurate measure of particle size distributions, particularly for diameters smaller than 20 nm. Here, we present a tailored interferometric microscope system, combined with a high-speed image-processing strategy, optimized for real-time particle tracking that determines accurate size distributions in nominal 5, 10, and 15 nm colloidal gold nanoparticle systems by automatically sensing and classifying thousands of single particles sampled from solution at rates as high as 4,000 particles per minute. We demonstrate this method by sensing the irreversible binding of gold nanoparticles to poly-D-lysine functionalized coverslips. Variations in the single-particle signal as a function of time and mass, calibrated by TEM, show clear evidence for the presence of diffusion-limited transport that most affects larger particles in solution.

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