| Summary: | 碩士 === 國立臺灣大學 === 應用力學研究所 === 107 === Fine particulate matter (PM2.5) is a critical and imperative problem in Asia. United Nation International Agency for Research on Cancer (IARC) had been considered it as 1A carcinogen, which means the substance is carcinogenic to human. According to the latest TEDS 9.0, it shows ratio of domestic usage and restaurant accounts for 17.13％ and 6.39 ％ of total PM2.5 emission respectively. The proportion is even higher than power supply industries which is 3.64％ of total emission. Therefore, it is crucial to deal with oil mist problem. Fibrous filter plays a crucial role in the market. However, the performance during loading and the difference of oleophilic and oleophobic remains poorly known. Hence, this study not only researches the performance of the material with different surface energy but also develops the better combination design in the market.
The research first concentrated on the performance of one commercial high efficiency particulate air (HEPA) filter during loading. Though electrostatic property was able to enhance the efficiency from 85.5％ to 99.7％, efficiency shrank sharply from 98.6％ to 88.3％ within 35 minutes owning to the shedding effect of filtered oil. Furthermore, most of commercial filter is oleophilic filter. Based on previous studies, there is only a few researches related to oleophobic filter; further, the penetration distribution during oil has not been discovered. Thus, here I not only presented the change of penetration distribution and pressure drop during loading but also divided the results into different characteristic regions. Last but not least, one better combination (oleophilic/-phobic) has been discovered and further applied it to improve the performance of HEPA filter, which prominently extended the time of efficiency above 90％ from 35 minutes to 215 minutes under the tested condition (CMD:265 nm; GSD:1.65; Concentration:5x106 counts/cm3).
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