氣泡於傾斜超疏水表面之運動行為

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林玟(Wen Lin) 查詢紙本館藏

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化學工程與材料工程學系

論文名稱

氣泡於傾斜超疏水表面之運動行為
(Sliding Bubble Motion along an Inclined Superhydrophobic Surface)

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摘要(中)

小氣泡很容易吸附在固體表面是由於一般基材都存在著接觸角遲滯 (Contact angle hysteresis, CAH) ，一旦浮力克服了毛細力，小氣泡就可以在極低接觸角遲滯的基材表面下緩緩移動，並且，氣泡在接觸角遲滯很小的超疏水表面下形狀相當平坦。本研究製備了兩種能在水中維持穩定的超疏水基材，觀察小氣泡於其下的運動行為。實驗結果顯示，體積為3~15 ul的小氣泡在超疏水表面下之垂直移動速率大於氣泡自由浮升速度 (此時雷諾數約為400~800)。隨著基材傾斜角度增加，氣泡滑移速度存在最大值，前方投影面積也呈現單調遞增，阻力係數與自由浮升氣泡相同。而氣泡滑移時的阻力較小則歸因於氣泡在超疏水基材上有較小的前方投影面積。

摘要(英)

Tiny bubbles readily stick onto substrates due to contact angle hysteresis (CAH). A tiny bubble can slide slowly on a surface with ultralow CAH once buoyancy overcomes capillarity. The bubble shape is very flat on a superhydrophobic surface which possesses nearly vanishing CAH. A superhydrophobic surface with the stability in water is fabricated to observe the sliding motion of tiny bubbles. It is surprising to find that bubbles of 3~15 ul slide beneath the superhydrophobic surface at a vertical ascent rate faster than freely rising ones of Re~O(100). As the tilted angle increases, there exists a maximum velocity, the frontal area of the bubble rises monotonically, and the drag coefficient remains essentially the same as that of a freely rising bubble. Consequently, the small drag force associated with sliding bubbles is attributed to their substantially small frontal areas on superhydrophobic surfaces.

關鍵字(中)

★ 氣泡
★ 超疏水表面

關鍵字(英)

★ bubble
★ superhydrophobic

論文目次

摘要 I
Abstract II
致謝 III
目錄 IV
圖目錄 VII
表目錄 XI
第一章緒論 1
1-1 前言 1
1-2 文獻回顧 3
1-2-1 氣泡之自由浮升運動 3
1-2-2 長型氣泡在封閉垂直管中之運動行為 12
1-2-3 氣泡在傾斜基材上之運動行為 14
1-3 研究動機與目的 22
第二章基本原理 23
2-1 潤濕現象理論 23
2-1-1 楊氏方程式 (Young’s equation) 23
2-1-2 溫佐方程式 (Wenzel’s equation) 24
2-1-3 卡西方程式 (Cassie equation) 25
2-2 接觸角遲滯 (Contact angle hysteresis, CAH) 27
2-3 邊界層分離 (Boundary layer separation) 32
2-4 阻力 (Drag force) 32
2-4-1 形狀阻力 (Form drag) 33
2-4-2 阻力係數 (Drag coefficient, CD) 34
第三章實驗介紹 36
3-1 實驗藥品及材料 36
3-2 實驗儀器 36
3-2-1 影像式接觸角量測儀 (Software-Controlled Multi Dosing System-DSA10) 36
3-2-2 全自動接觸角量測儀 (Operating Manual OCA 15EC) 39
3-2-3 高速攝影機 (Optronis CMOS (Cam Record450*2)) 40
3-2-4 數位相機 42
3-2-5 巨觀放大顯微量測系統 42
3-2-6 其他儀器設備 43
3-3 實驗流程 44
3-3-1 製備Lubricant-infused表面 44
3-3-2 製備氧化亞銅粉之超疏水基材 44
3-3-3 製備聚四氟乙烯之超疏水基材 45
3-3-4 利用高速攝影機觀察氣泡滑移速度 46
3-3-5 氣泡自由浮升速度 47
3-4 實驗結果分析 48
3-4-1 氣泡滑移速度計算 48
3-4-2 Mobility計算 48
3-4-3 前方投影面積 (Af) 計算 49
3-4-4 阻力係數 (CD) 計算 50
第四章接觸角遲滯對氣泡運動行為之影響 51
4-1 接觸角遲滯 (Contact angle hysteresis, CAH) 51
4-2 一般基材表面氣泡的滑動行為 53
4-3 超低遲滯表面氣泡的滑動行為 55
第五章超疏水表面上的氣泡運動行為 62
5-1 超疏水表面的潤濕行為 62
5-2 超疏水表面的氣泡滑移 63
5-2-1 氣泡在氧化亞銅超疏水基材下之運動行為 64
5-2-2 氣泡在PTFE超疏水基材下之運動行為 68
5-3 氣泡形變對氣泡運動行為之影響 74
第六章結論 79
第七章參考資料 80

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指導教授

曹恆光

審核日期

2016-6-22

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