帶電纖維濾材之過濾特性研究

Filtration Characteristics of Charged Fibers Filter

鍾羽柔(Yu-Rou Jhong)

指導教授 ： 林文印

國立臺北科技大學/工程學院/環境工程與管理研究所/碩士(2012年)

摘要

奈米級纖維因具有較小直徑及較大表面積而具有較廣泛的用途，如過濾材或防護衣等，其應用領域包含環境工程、生物科技、紡織、化工及電子等產業。靜電濾材(electret filters)表面具有靜電吸引作用，隨著帶電量的增加，微粒穿透力會逐漸減小。
本研究設置一電紡絲之奈米纖維製備系統，以聚甲基丙烯酸甲酯(poly(methyl methacrylate)，PMMA)為高分子聚合物，產生奈米級與次微米級之纖維，並添加不同介電材料進行基本性質評估，及量測纖維濾材壓力損失及帶電狀況之穿透效率。
研究結果顯示，TiO2/PMMA或BaTiO3/PMMA之纖維濾材經由XRD分析發現晶相結構沒有改變；電阻係數部分可以發現添加TiO2或BaTiO3之纖維電阻係數均有增加，並利用靜電穩定度觀察發現持久度較純PMMA纖維佳；本研究最終將纖維濾材應用於微粒收集之目的上，並利用電暈放電使纖維濾材帶電，結果顯示在充電情況下，纖維直徑540 ± 66 nm、1004 ± 75 nm及2148 ± 261 nm之純PMMA纖維濾材過濾效率從原本的89.0、61.1及23.0 %增加為95.7、71.1及43.5%；添加TiO2及BaTiO3之纖維濾材過濾效率為99.4、91.0及86.4 %。

關鍵字

靜電濾材 ； 介電常數 ； 鈦酸鋇 ； 二氧化鈦

並列摘要

Nanofibers that were produced using this technique offer the potential for wide variety of applications such as filtration for air or water, tissue engineering scaffolds, protective clothing and biomedical application etc. Due to the exceptional properties: high specific surface area, high aspect ratio and small pore sizes, for instance. The electrets filters surface has electrostatic attraction, as with the increase in electricity, particle penetration will gradually decrease.
An electrospinning system was set up in this study. Using PMMA to produce nano and submicro-nano fibers, and added different dielectric materials to assess the basic properties and measure the pressure drop and the penetration efficiency with charged.
The results of the study showed after added, the fibers’ crystalline structures didn’t change and the resistance coefficient increase. As the result of static stability, the TiO2/PMMA or BaTiO3/PMMA was better than pure PMMA fibers. The final purpose was using the fiber filters applied to the particles collected and its will charged by corona discharge. The collection efficiency of 540 ± 66 nm, 1004 ± 75 nm, and 2148 ± 261 nm filters increased from 89.0 to 95.7 %, 61.1 to 71.1 %, and 23.0 to 43.5 %, respectively, as charging under 12 kV. In addition, mixing the capacitor material with PMMA of 540 ± 66 nm, 1004 ± 75 nm, and 2148 ± 261 nm filters could increase the collection efficiency from 95.7 to 99.4 %, 71.1 to 91.0 %, and 43.5 to 86.4 %, respectively.

並列關鍵字

Electret filters ； Dielectric constant ； BaTiO3 ； TiO2

參考文獻

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