NER: Fractal Nanoagglomerates: A New Filter Media For HEPA Filters

NER：分形纳米团聚体：HEPA 过滤器的新型过滤介质

• 批准号: 0507936
• 负责人: Robert Pfeffer
• 金额: $ 13万
• 依托单位: New Jersey Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-07-15 至 2007-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0507936&HistoricalAwards=false
• 关键词: NER; Fractal; Nanoagglomerates; New; Filter

This project seeks to determine whether a medium made of fractal agglomerates of nanoparticles will act as an efficient and cost-effective filter for removing ultra-fine aerosol particles from gas streams and to evaluate whether such a filter medium can perform as well or better than fiber-based HEPA filters with respect to providing low pressure drop, high filtration efficiency, and high capacity before clogging. The work also will develop models to predict filtration efficiency, pressure drop, and capacity of the nano-agglomerate filter medium. Nanoparticles in the dry state have been found to consist of porous agglomerates with a hierarchical fractal structure and a high porosity ( 0.99). This structure results in a multi-modal pore size distribution within the agglomerates, which is very different from the unimodal pore-size distribution found in widely used fiber-based HEPA filters. Preliminary evidence has shown that such nano-agglomerate filters act as a depth filters and thus have significantly greater capacity (up to two orders of magnitude) than traditional fiber-based HEPA filters. HEPA filters are widely used in many industrial processes and even in homes, and if successful, this work could have significant economic benefits.

该项目旨在确定由纳米颗粒的分形团聚体制成的介质是否将作为用于从气流中去除超细气溶胶颗粒的有效且具有成本效益的过滤器，并评估这种过滤介质是否可以在提供低压降、高过滤效率和堵塞前的高容量方面与基于纤维的HEPA过滤器一样好或更好地执行。这项工作还将开发模型来预测过滤效率，压降和纳米团聚过滤介质的容量。已发现在干燥状态下的纳米颗粒由具有分级分形结构和高孔隙率（0.99）的多孔团聚体组成。这种结构导致聚集体内的多峰孔径分布，这与广泛使用的基于纤维的HEPA过滤器中发现的单峰孔径分布非常不同。初步证据表明，这种纳米团聚物过滤器用作深度过滤器，因此具有比传统的基于纤维的HEPA过滤器大得多的容量（高达两个数量级）。HEPA过滤器广泛应用于许多工业过程，甚至家庭中，如果成功，这项工作可能会产生显着的经济效益。