Size-Resolved Measurement of Ultrafine and Nanometer Particle Concentrations

超细和纳米颗粒浓度的尺寸分辨测量

• 批准号: 8591291
• 负责人: Susanne Vera Hering
• 金额: $ 14.79万
• 依托单位: AEROSOL DYNAMICS, INC.
• 依托单位国家: 美国
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2014-08-28
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8591291
• 关键词: Size; Resolved; Measurement; Ultrafine; Nanometer

ABSTRACT Size-Resolved Measurement of Ultrafine and Nanometer Particle Concentrations This proposal addresses the need to assess worker and community exposure to engineered nanomaterials and other ultrafine particles. The ultimate aim is the development of a compact, battery powered instrument for size- and time-resolved measurement of ultrafine and nanometer particle number concentrations. To reach this goal, two novel technologies are used: (1) the opposed migration aerosol classifier developed at the California Institute of Technology, and (2) a self-sustaining laminar-flow water condensation particle counter being developed by our firm. Like the commonly-used scanning mobility particle size spectrometers, the opposed migration aerosol classifier uses electrical mobility classification, but its cross-flow geometry provides an inherently more compact instrument. The self-sustaining laminar-flow water condensation counter that serves as the detector has the same wide dynamic range of commercial counters, but does not require liquid fill reservoirs, and can be operated in any orientation. In contrast to the existing methods, our approach is inherently smaller and lighter. This Phase I project aims to show that it can be made to be unobtrusive, battery operable and suitable for personal monitoring. Specific objectives for this Phase I project are: 1) to demonstrate electrical mobility particle size classification spanning from 10 nm to 200 nm, with a resolution of 6 or more channels in less than 60s; 2) to demonstrate water-based condensation particle detection with at least 90% detection at 10 nm in an instrument that may be tipped, and that sustains 24-hr operation without the addition of water, 3) to construct an integrated mobility separator and detector module that is no more than 15 cm in any dimension; 4) to evaluate the accuracy, size resolution, and time response through tests with monodisperse aerosols and comparison under ambient conditions to a standard scanning mobility particle size spectrometer; and 5) to evaluate the suitability to be packaged as a wearable particle-sizing detector based on measured performance, size, weight, and power of the sizing classification and detector module.

摘要 超细和纳米颗粒浓度的尺寸分辨测量 该提案涉及评估工人和社区暴露于工程 纳米材料和其他超细颗粒。最终目标是制定一项契约， 用于超细和纳米尺寸和时间分辨测量的电池供电仪器 颗粒数浓度。为了达到这一目标，使用了两种新技术：（1） 加州理工学院开发的反迁移气溶胶分类器，以及（2） 我们公司正在开发的一种自持层流水凝结粒子计数器。 与常用的扫描迁移率粒度谱仪一样， 气溶胶分类器使用电迁移率分类，但其交叉流动几何形状提供了一种 更紧凑的仪器。自持层流水冷凝 用作检测器的计数器具有与商用计数器相同的宽动态范围， 但不需要液体填充容器，并且可以在任何方向上操作。相比 与现有的方法相比，我们的方法本质上更小更轻。第一阶段项目旨在 以表明它可以被制成不显眼的、电池可操作的并且适合于个人使用， 监测. 第一阶段项目的具体目标是：1）展示电迁移率颗粒尺寸 分类范围从10 nm到200 nm，分辨率为6个或更多通道， 2）证明水基冷凝颗粒检测至少90% 在可倾斜的仪器中在10 nm处进行检测，并可持续24小时运行 在不添加水的情况下，3）构建集成的迁移率分离器和检测器 任何尺寸不超过15 cm的模块; 4）评估精度，尺寸 分辨率和时间响应，通过单分散气溶胶测试和 环境条件下的标准扫描迁移率粒度光谱仪;和5）评估 适合包装为基于测量的可穿戴颗粒尺寸检测器 尺寸分级和检测器模块的性能、尺寸、重量和功率。