ABSTRACT Porous polyurethane foam was evaluated to replace the eight nylon meshes used as a substrate to collect nanoparticles in the Nanoparticle Respiratory Deposition (NRD) sampler. Cylindrical (25 mm diameter by 40 mm deep) foam with 100 pores per inch was housed in a 25-mm-diameter conductive polypropylene cassette cowl compatible with the NRD sampler. Pristine foam and nylon meshes were evaluated for metals content via elemental analysis. The size-selective collection efficiency of the foam was evaluated using salt (NaCl) and metal fume aerosols in independent tests. Collection efficiencies were compared to the nanoparticulate matter (NPM) criterion and a semi-empirical model for foam. Changes in collection efficiency and pressure drop of the foam and nylon meshes were measured after loading with metal fume particles as measures of substrate performance. Substantially less titanium was found in the foam (0.173 µg sampler−1) compared to the nylon mesh (125 µg sampler−1), improving the detection capabilities of the NRD sampler for titanium dioxide particles. The foam collection efficiency was similar to that of the nylon meshes and the NPM criterion (R2 = 0.98, for NaCl), although the semi-empirical model underestimated the experimental efficiency (R2 = 0.38). The pressure drop across the foam was 8% that of the nylon meshes when pristine and changed minimally with metal fume loading (∼19 mg). In contrast, the pores of the nylon meshes clogged after loading with ∼1 mg metal fume. These results indicate that foam is a suitable substrate to collect metal (except for cadmium) nanoparticles in the NRD sampler. Copyright © 2016 American Association for Aerosol Research

中文翻译：

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多孔聚氨酯泡沫用作纳米粒子呼吸沉积采样器中的粒子收集基底


摘要：对多孔聚氨酯泡沫进行了评估，以取代用作基材的八个尼龙网，以在纳米颗粒呼吸沉积（NRD）采样器中收集纳米颗粒。每英寸有 100 个孔的圆柱形（直径 25 毫米，深 40 毫米）泡沫被安置在与 NRD 采样器兼容的 25 毫米直径导电聚丙烯盒式罩中。通过元素分析评估原始泡沫和尼龙网的金属含量。在独立测试中使用盐 (NaCl) 和金属烟雾气溶胶评估了泡沫的尺寸选择性收集效率。将收集效率与纳米颗粒物质 (NPM) 标准和泡沫的半经验模型进行比较。在加载金属烟雾颗粒后，测量泡沫和尼龙网的收集效率和压降的变化，作为基材性能的测量。与尼龙网 (125 µg 采样器−1) 相比，泡沫 (0.173 µg 采样器−1) 中的钛含量明显减少，从而提高了 NRD 采样器对二氧化钛颗粒的检测能力。尽管半经验模型低估了实验效率（R2 = 0.38），但泡沫收集效率与尼龙网和 NPM 标准（R2 = 0.98，对于 NaCl）相似。当原始状态下，泡沫上的压降是尼龙网的 8%，并且随着金属烟雾负载（约 19 毫克）的变化最小。相比之下，尼龙网的孔在加载约 1 毫克金属烟雾后被堵塞。这些结果表明泡沫是 NRD 采样器中收集金属（镉除外）纳米颗粒的合适基材。版权所有 © 2016 美国气溶胶研究协会