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Comparison of diffusion charging and mobility-based methods for measurement of aerosol agglomerate surface area

机译：基于扩散充电的比较和基于迁移率的气溶胶凝聚表面积的方法

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We compare different approaches to measure surface area of aerosol agglomerates. The objective was to compare field methods, such as mobility and diffusion charging based approaches, with laboratory approach, such as Brunauer, Emmett, Teller (BET) method used for bulk powder samples. To allow intercomparison of various surface area measurements, we defined ‘geometric surface area’ of agglomerates (assuming agglomerates are made up of ideal spheres), and compared various surface area measurements to the geometric surface area. Four different approaches for measuring surface area of agglomerate particles in the size range of 60–350 nm were compared using (i) diffusion charging-based sensors from three different manufacturers, (ii) mobility diameter of an agglomerate, (iii) mobility diameter of an agglomerate assuming a linear chain morphology with uniform primary particle size, and (iv) surface area estimation based on tandem mobility–mass measurement and microscopy. Our results indicate that the tandem mobility–mass measurement, which can be applied directly to airborne particles unlike the BET method, agrees well with the BET method. It was also shown that the three diffusion charging-based surface area measurements of silver agglomerates were similar within a factor of 2 and were lower than those obtained from the tandem mobility–mass and microscopy method by a factor of 3–10 in the size range studied. Surface area estimated using the mobility diameter depended on the structure or morphology of the agglomerate with significant underestimation at high fractal dimensions approaching 3.
机译：我们比较不同的方法来测量气溶胶附聚表面积。该目的是比较现场方法，例如基于移动性和扩散充电的方法，具有实验室方法，例如Br​​unauer，Emmett，Teller（Bet）方法，用于散装粉末样品。为了允许各种表面积测量的相互作用，我们定义了附聚物的“几何表面积”（假设附聚物由理想的球体构成），并将各种表面积测量与几何表面积进行比较。使用来自三种不同制造商的三种不同制造商的扩散充电的传感器进行比较尺寸范围为60-350nm的尺寸范围的四种不同方法，（ii）聚集的迁移率直径，（iii）迁移率直径一种基于串联迁移率质量测量和显微镜的均匀初级粒度的线性链形态和（IV）表面积估计，凝聚。我们的结果表明，与BET方法不同，可以直接施加到空气中颗粒的串联迁移率测量，与BET方法一致。还表明，银凝聚的三个扩散充电的表面积测量在2倍的倍数下相似并且低于从串联迁移率和显微镜方法获得的那些，在尺寸范围内为3-10倍研究过。使用迁移率直径估计的表面积取决于聚集的结构或形态，在接近3的高分分形尺寸下具有显着低估的凝聚。

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