Evaluation of airborne particle emissions from commercial products containing carbon nanotubes
Evaluation of airborne particle emissions from commercial products containing carbon nanotubes
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DOI：
10.1007/s11051-012-1231-8
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发表时间：
2012-11-01
影响因子：
2.5
通讯作者：
Peters, Thomas M.
中科院分区：
文献类型：
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作者：
Huang, Guannan;Park, Jae Hong;Peters, Thomas M.
在使用三种砂粒尺寸和三种盘式砂磨机速度进行砂磨时，对具有不同碳纳米管 (CNT) 负载量的环氧树脂测试棒和两种商业产品的空气中颗粒的排放进行了表征。使用冷凝粒子计数器、光学粒子计数器和扫描迁移率粒度仪测量发射粒子的总数浓度、可呼吸质量浓度和粒子尺寸数/质量分布。在聚碳酸酯过滤器上对发射的颗粒进行采样并使用电子显微镜进行分析。使用粗砂纸、2%（重量比）CNT 测试棒和中等盘式砂磨机速度产生最高的数量浓度（算术平均值 = 4,670 个颗粒/cm(3)），而使用中型砂纸、2% CNT 测试棒和慢速盘式砂磨机速度产生最低数量浓度（算术平均值 = 92 个颗粒/cm(3)）。细砂纸、2% CNT 测试棒和中盘砂磨机速度的可吸入质量浓度最高（算术平均值 = 1.01 mg/m(3)），而中砂纸、0% CNT 测试棒和中盘砂磨机速度的可吸入质量浓度最低（算术平均值 = 0.20 mg/m(3)）。对于 CNT-环氧树脂样品，空气中的颗粒主要是带有 CNT 突出物的微米尺寸的环氧树脂核心。除了使用 4% CNT-环氧树脂进行的测试外，空气中的样品中未观察到游离 CNT。打磨含有碳纳米管的产品时产生的空气颗粒的数量浓度、质量浓度和尺寸分布取决于打磨条件和被打磨材料的特性。
The emission of the airborne particles from epoxy resin test sticks with different carbon nanotube (CNT) loadings and two commercial products were characterized while sanding with three grit sizes and three disk sander speeds. The total number concentrations, respirable mass concentrations, and particle size number/mass distributions of the emitted particles were measured using a condensation particle counter, an optical particle counter, and a scanningmobility particle sizer. The emitted particles were sampled on a polycarbonate filter and analyzed using electron microscopy. The highest number concentrations (arithmetic mean = 4,670 particles/cm(3)) were produced with coarse sandpaper, 2 % (by weight) CNT test sticks and medium disk sander speed, whereas the lowest number concentrations (arithmetic mean = 92 particles/cm(3)) were produced with medium sandpaper, 2 % CNT test sticks and slow disk sander speed. Respirable mass concentrations were the highest (arithmetic mean = 1.01 mg/m(3)) for fine sandpaper, 2 % CNT test sticks and medium disk sander speed and the lowest (arithmetic mean = 0.20 mg/m(3)) for medium sandpaper, 0 % CNT test sticks andmediumdisk sander speed. For CNT-epoxy samples, airborne particles were primarily micrometer-sized epoxy cores with CNT protrusions. No free CNTs were observed in airborne samples, except for tests conducted with 4 % CNT-epoxy. The number concentration, mass concentration, and size distribution of airborne particles generated when products containing CNTs are sanded depends on the conditions of sanding and the characteristics of the material being sanded.