PM2.5為大氣中的細小懸浮顆粒，易吸附有毒物質而易沉積於氣管內，引起呼吸性的疾病，因此，發展能有效隔離PM2.5的材料是現今重要的研究議題，本文以提升紗網隔離效率為研究主軸。
本研究首先建立穩定的測試系統、測試市售紗網的去除效率，並對不鏽鋼紗網進行表面改質，利用高分子材料的表面特性、奈米粒子的高比表面積及化學特性改善去除效率，分析製程參數之效應以找出最適化製備條件，並以離子層析儀、傅立葉轉換紅外線光譜儀及水滴接觸角量測儀探討其去除機制。研究結果顯示，紗網的去除效率與壓損、網目數以及線徑的寬窄有直接的相關性，壓損及網目數的增加能有效提升去除效率。利用液態矽膠A1以及奈米粒子B1對表面進行改質能提升12-20%以及20-25%的去除效率，且改質之最適擔載量會隨紗網的網目及線徑而改變，隨著線徑越小，所需的改質量也相對較少。進一步進行長時間光照、清洗測試，結果顯示液態矽膠A1具耐水洗與耐紫外線的特性，而奈米粒子B1則有水洗後固定化不佳的缺點。最後將改質紗網進行實場測試，結果亦顯示其去除效率與標準測試系統的結果一致，顯示其具有實用化潛力。

PM2.5 is the fine suspended particulate in the atmosphere. It adsorbs toxic substances easily and deposited at the trachea, causing respiratory diseases. Therefore, the development of materials for effective isolation PM2.5 from indoor environment becomes an important research topic nowadays. This work focused on improving the isolated efficiency of screen-window material for fine particulate.
In this study, a stable test system was firstly established to evaluation the isolated efficiency of several commercial meshes. The surface of stainless steel mesh was furtherly modified for the enhancement of its efficiency. The isolated efficiency of stainless steel mesh was increased in the presence of liquid silicone on its surface due to its viscous properties. A coating of nanoparticle with high surface area and hydrophilicity properties also resulted in the improvement of isolated efficiency. The effects of manufacture parameters on isolated efficiency were analyzed to obtain the optimal preparation conditions. The isolation mechanisms were investigated by using ion chromatography, Fourier transform infrared spectrometer, and contact angle meter. The results showed that the isolation efficiency of mesh is directly proportional to the pressure drop, the number of meshes, and the wire diameter. The liquid silicone A1 and nanoparticle B1 used as surface modifier can increase the isolation efficiency by 12-20% and 20%-25%, respectively. The optimum loading amount of modifier will be changed with the mesh number and wire diameter. The smaller wire diameter is, the less loading amount of modifier is. The UV-illumination and wash-fastness tests were further carried out, indicating the liquid-silicone A1 coating exhibits well stability, while a few nanoparticles B1 will be washed out by water. Finally, the modified mesh was applied in field tests with using a joss stick as particulate source. The isolation efficiency was consistent with the result of the standard test system, indicating the practicality of this modified mesh.

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