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毛细血管孔膜过器的纳米粒子收集效率

W D Cyrs^1,2, D A Boysen¹, G Casuccio³

¹The University of Iowa, 100 Oakdale Campus, 121 IREH, Iowa City, IA 52242, USA.

Journal of aerosol science

|August 16, 2023

概括

毛细管孔膜过器显示,对微小粒子的表面收集效率较低. 纳米粒子沉积主要发生在过孔内,而不仅仅发生在表面.

科学领域:

环境科学环境科学
材料科学材料科学材料科学
气溶科学气溶科学

背景情况:

毛囊孔膜过器用于空气采样.
精确测量空气中的颗粒取决于过器收集效率.
了解颗粒沉积对于空气质量监测至关重要.

研究的目的:

量化毛细毛细管孔膜过器对微小粒子的表面和整体收集效率.
为了研究颗粒大小和过器面速度对收集效率的影响.
为了确定过器中纳米颗粒的主要沉积位置.

主要方法:

使用扫描电子显微镜 (SEM) 测量过器表面的粒子负载.
使用扫描移动粒子测量器 (SMPS) 来确定空气中的颗粒度.
测试过的过器具有0.4微米和0.8微米的孔径,面速为3.7厘米/秒和18.4厘米/秒.

主要成果:

表面收集效率为<100%的粒子<16nm和<55%的粒子<100nm.
对于70nm粒子,总体收集效率下降到45%.
纳米粒子收集效率总体上明显高于表面效率,这表明内部孔隙沉积.

结论:

表面采集效率不足以通过过分析准确评估纳米粒子度.
纳米颗粒的沉积主要发生在过孔内,而不仅仅发生在表面.
精确推导空气中纳米粒子度需要考虑内部波器沉积机制.

关键词:

空气采样采样空气采样效率效率是指效率是指效率.过器过器过器纳米颗粒是如何形成的

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