臺灣博碩士論文加值系統

閥門在微流體中扮演一個相重要的角色，可以進行流體的流動控制，甚至可自動開啟。因為毛細管閥的成本且可保持空氣暢通，為一種普遍被使用的閥。我們的研究發現除了幾何形狀外，微儲槽（micro-chamber）表面的靜摩擦力也會對毛細管閥的效果造成影響。本研究將探討液橋（liquid bridge）於微儲槽中的摩擦力，探討的變因包括表面張力、接觸角、兩平行碟片的距離和液體體積。

Valving is an important function in the microfluidics since it provides the ability to control the fluid flow and eventually leads to automation. Capillary valving is the most popular type of valving since it is low cost and also provides good air venting. In our study of capillary valving, it is found that in addition to the geometry of the valving design, the static friction in the micro-chamber also plays important roles. A series of experiments were carried out to study the effect of friction in the micro-chamber using a “liquid bridge” model. It is found that factors such as surface tension, contact angle, distance between two parallel disks and volume of liquid affect the friction in the micro-chamber.

第一章　緒論 1
1.1　微型綜合分析系統 1
1.2　微流體碟片和毛細管閥 1
1.3　毛細管閥之原理：毛細管壓差 2
1.4　相關研究 5
1.4　研究動機與目的 11
第二章　相關理論 14
2.1　流體於旋轉碟片的運動分析 14
2.2　Young-Laplace方程式（或稱Laplace方程式） 17
2.3　Young方程式 18
2.4　液橋力 20
2.5　遲滯現象與動態接觸角 21
第三章　實驗步驟與儀器 23
3.1　微流體碟片製作 23
3.2　微流體碟片流體觀測系統 26
3.3　實驗參數設計 29
第四章　實驗結果與討論 32
4.1　截面加寬後之情形 32
4.2　靜態接觸角與表面張力之影響 34
4.3　截面高度之影響 36
4.4　液體體積之影響 37
第五章　結論及未來展望 40
5.1　結論 40
5.2　未來展望 40
參考文獻 41

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