氣泡於傾斜超疏水表面之運動行為｜國立中央大學博碩士論文系統

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研究生：	馬英莎 Inggit Kresna Maharsih
論文名稱：	氣泡於傾斜超疏水表面之運動行為 Sliding Motion of Liquid Drops on an Inclined Hysteresis-free Surface: Remobilizing Surfactant
指導教授：	曹恆光 Dr. Heng-Kwong Tsao
口試委員:
學位類別：	碩士 Master
系所名稱：	工學院 - 化學工程與材料工程學系 Department of Chemical & Materials Engineering
論文出版年：	2017
畢業學年度：	105
語文別：	英文
論文頁數：	97
中文關鍵詞：	Remobilizing surfactant 、注油表面、接觸角遲滯、滑动速度
外文關鍵詞：	Remobilizing surfactant, Oil-infused surface, Contact angle hysteresis, Sliding velocity
相關次數：	點閱：10 下載：0
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奈米液滴在極低接觸角遲滯表面上的移動行為已被廣泛地觀測與研究，並利用其優勢發展出微流道系統和其他科技應用。然而，並非所有的極低接觸角表面都可以用於界面活性劑溶液中，因此本論文著重於不同濃度之界面活性劑溶液對於自製低遲滯油填充表面的影響。
將多孔性PTFE止瀉帶拉伸並包覆於載玻片上，再塗布上潤滑油，即可製作出油填充的低遲滯表面。並利用inflation-deflation method和斜板法來驗證此表面具低遲滯的特性。因為它具有此特殊性質，我們選用三種不同的界面活性劑:SDS、DTAB和Triton X-100溶液，計算此三種溶液的液滴在油填充表面上的滑移速度。另外，我們也將油填充表面置放於三種不同的界面活性劑中，計算氣泡在表面下之滑移速度。結果可以發現:不管是液滴還是氣泡，隨著界面活性劑濃度的提高，滑移速度都會降低，原因是液滴在滑移的過程中會改變形狀；氣泡則是除了形狀改變、前投影面積變大的因素外，還會受到Marangoni stress的影響。然而，當界面活性劑超過臨界微胞濃度後，液滴與氣泡的滑移速都有所提升，稱之為remobilizing surfactant。
在本論文的後段，也探討了含氟之界面活性劑與油填充低遲滯表面的交互作用，因為這兩者之間多了化學親和力，造成在表面上呈現一系列動態接觸角的變化。

The motions of nanodrops on the hysteresis-free surfaces are widely observed to explore the advantages applied in microfluidic systems and technologies. Since not all hysteresis-free surfaces are resistance upon surfactant solution, in this work, the effect of various concentrations of surfactants upon an oil-infused surface has been studied.
An oil-infused surface is fabricated by stretching porous PTFE tape on glass slide and coated it with fluorinated lubricant. The characteristics of hysteresis-free surface are examined on it, by using inflation-deflation method and tilted plane method. Since it shows hysteresis-free behavior, drops containing each three types of surfactants, SDS, DTAB, and Triton X-100, are deposited on it and the sliding motion is calculated. The bubbles motion is also determined under an oil-infused surface in surfactant solutions. It is shown that in aqueous solution, the sliding velocity of both drops and bubbles are retarded, due to shape deformation for drops, while for bubbles associated with large frontal area and effect of Marangoni stress. However, the sliding velocity of drops and bubbles rising after the concentration reaches CMC. This phenomenon corresponds to remobilizing surfactant, which is making the surface concentration becomes uniform.
And the last is investigation of fluorinated surfactant interaction with an-oil-infused surface. The two components have chemical affinity interaction, since the drop containing surfactant has dynamic contact angle on it.

摘要    i
ABSTRACT    ii
ACKNOWLEDGEMENTS    iii
LIST OF CONTENTS    iv
LIST OF FIGURES    vii
LIST OF TABLES    x
CHAPTER 1 INTRODUCTION    1
1-1    Background    1
1-2    Motivation    2
1-3    Wetting phenomena    3
1-3-1    Surface tension    3
1-3-2    Contact angle    6
1-3-3    Contact angle hysteresis    10
1-4    Characteristics of surfactants    12
1-4-1    Classification of surfactants    12
1-4-2    Critical micelle concentration    16
1-4-3    Adsorption behaviors    17
1-5    Literature review    17
1-5-1    Lubricant-infused surfaces    17
1-5-2    Movement of drops on a tilted surface    20
1-5-3    Movement of bubbles on a tilted surface    25
1-5-4    Movement of drops and bubbles in surfactant-contained medium    29
CHAPTER 2 EXPERIMENTAL METHODS    32
2-1    Materials    32
2-2    Apparatuses    33
2-2-1    The drop shape analyzer-DSA25 , Kruss, Germany    33
2-2-2    The drop shape analyzer OCA 15 EC, Data Physics (Germany)    35
2-2-3    Electronic balance, having precision of  0.1 mg, (Quintix 224-1S, Sartorius, Germany), has been used for weighing purpose.    35
2-2-4    Spin coater    36
2-2-5    Hot plate and stirrer    36
2-3    Experimental procedure    36
2-3-1    Preparation of oil-infused surfaces    36
2-3-2    Preparation of surfactant solutions    38
2-3-3    Recording the drop motion on oil-infused surfaces    39
2-3-4    Recording the bubble motion beneath oil-infused surfaces    40
2-3-5    Experiment of drop-defect interaction    40
2-3-6    Experiment of effects of similar compounds between surfactants and solid surfaces    41
2-4    Data analysis    41
2-4-1    Surface tension measurement and CMCs determination    41
2-4-2    Contact angle measurement    45
2-4-3    Terminal velocity calculation    46
CHAPTER 3 CONTACT ANGLE HYSTERESIS-FREE CHARACTERISTICS OF AN OIL-INFUSED SURFACE    47
3-1    Inflation-deflation method    47
3-2    Tilted plane method    49
3-3    Drop-defect interaction on hysteresis-free surfaces    51
CHAPTER 4 EFFECT OF SURFACTANTS ON THE DROP MOTION ALONG OIL-INFUSED SURFACES    55
4-1    Contact angle hysteresis-free characteristics of sessile drop    55
4-2    Effect of surfactant on the drop shape    56
4-3    Sliding velocity sessile drops    59
CHAPTER 5 EFFECT OF SURFACTANTS ON BUBBLES MOTION ALONG OIL-INFUSED SURFACES    64
5-1    Contact angle hysteresis-free characteristics of captive bubbles    64
5-2    Effect of surfactant on the bubble shape    65
5-3    Sliding velocity of captive bubbles    66
CHAPTER 6 INTERACTIONS BETWEEN SURFACTANT AND SURFACES CONTAINING THE SAME COMPOSITION    73
6-1    Fluorinated surfactant and the oil-infused surface    73
6-2    Systems of fluorinated surfactant/PTFE surface and Brij 35/wax surface    75
CONCLUSION    77
REFERENCES    79

                                

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