無動件式高流率電滲泵的製作與特性分析

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姓名

賴俊伯(Chun-po Lai) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

無動件式高流率電滲泵的製作與特性分析
(Fabrication and Performance Study of High Flow Rate Electroosmotic Pump)

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摘要(中)

本文以燒結矽多孔介質製作一高流率的小型電滲泵(electroosmotic pump, EOP)，以燒結矽濾材的多孔介質作為微流道傳輸液體，濾材直徑有二種(D=4, 2.5 cm)，流道孔隙直徑約1-2 μm。此種無動件泵以電雙層(electrical double layer)效應驅動流體，可產生高壓和高流率。我們使用不同濃度(0.5-4 mM)、不同酸鹼值(pH 7.6-9.2) 的硼酸鹽水溶液為工作流體並以不同電壓(25-250 V)進行性能測試。濃度與pH值越高的工作流體能產生的流率越高。電滲泵(D=4 cm)於工作電壓250 V，可產生最大流率Qmax=32 ml/min、最大壓力差Pmax=128 kPa、每單位面積電壓產生的流率Qmax/(AV)=0.012 ml/min/(V.cm2)。
因電解反應隨著電壓增加而增強，在電極附近有氫、氧氣泡產生。藉由加入離子交換膜(Nafion)與透析膜能降低氣泡對流體傳輸的不利影響，此外使用不銹鋼電極取代負極的白金電極也能有效的壓抑氣泡，最大流率可提升15%。以並聯2片濾材(D=2.5 cm)的方式設計製作電滲泵，流率可增加2倍。縮短二電極距離增加電場強度可提升流率，於工作電壓200 V量測泵的性能如下：Qmax=18.6 ml/min、Pmax=210 kPa和Qmax/(AV)=0.023 ml/min/(V.cm2)。此電滲泵能持續不間斷的運作10小時，顯示其有相當的可靠度。

摘要(英)

A high flowrate electroosmotic (EO) pump is fabricated from a porous sintered silica frit (two sizes with diameter D=4, 2.5 cm) as tortous microchannels (pore diameter about 1-2 μm) to transport liquid. This EO pump has no moving part, which utilizes the electric double layer (EDL) effect as driving force, can generate high back pressure and large flow rate. The working fluid is the borate solution with various range of concentrations (C=0.5-4 mM) and pH value (7.6-9.2). Moderate range of voltages (V=25-250 V) is applied to the electrode. The solution with high concentration and pH vlaue result in high flowrate. The EO pump (D=4 cm) generates maximum flowrate Qmax=32 ml/min, maximum pressure Pmax=128 kPa, and a maximum flow rate per area and per voltage Qmax/(AV)=0.012 ml/min/(V.cm2) at 250 V applied voltage.
Due to the electrolysis reaction in the solution, bubbles (hydrogen and oxigen) generate near the electrode as the applied voltage increase, and that may retard the flow transport. Several approaches are utilized to reduce bubbles flow into downstream of EO pump, including insert the Nafion and dialysis membrane in the cathode chamber and replace the Pt electrode with the stainless steel elctrode. Overall, the flowrate is increased about 15%. Next, the EO pump with smaller porous frit (D=2.5 cm) is tested. The flowrate of EO pump increase twofold by connect two units of frit in parallel. By decreasing the distance of electrode-pair the electrical field strength increase, and the pump performance enhance too, with Qmax=18.6 ml/min, Pmax=210 kPa, and Qmax/(AV)=0.023 ml/min/(V.cm2). This EO pump can continuously run for 10 hours, which show its reliability.

關鍵字(中)

★ 電滲泵
★ 燒結矽多孔介質

關鍵字(英)

★ porous sintered silica frit
★ electroosmotic pump

論文目次

摘要 I
Abstract II
目錄 III
圖目錄 V
表目錄 VII
符號表 VIII
第一章緒論 1
1.1研究動機 1
1.2 各式微泵介紹 2
1.3 文獻回顧 4
1.4 研究目的 8
第二章電滲泵工作原理 10
2.1 電滲流理論 10
2.2 工作流體特性與電滲流的關係 13
2.2.1界面電位勢 13
2.2.2電雙層特徵厚度 14
第三章電滲泵設計製作 16
3.1 電滲泵製作 16
3.2 實驗設備 17
3.3 實驗材料 17
3.3.1溶液配置 17
3.3.2多孔介質 18
3.3.3離子交換膜與透析膜 18
3.3.4電極 19
3.4 實驗方法與步驟 20
第四章結果與討論 22
4.1 流率 22
4.2 壓力 26
4.3 泵可靠度與實驗重現性 27
4.4 泵性能探討與比較 28
第五章結論 31
5.1結論 31
5.2未來改進方向 32
參考文獻 34

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指導教授

吳俊諆(Jiunn-chi Wu)

審核日期

2007-6-25

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