含界面活性劑液滴在SBSi表面上的特殊行為;Exotic wetting behavior of surfactant drops on SBSi

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Title:	含界面活性劑液滴在SBSi表面上的特殊行為;Exotic wetting behavior of surfactant drops on SBSi
Authors:	王姿妤;Wang, Tzu-Yu
Contributors:	化學工程與材料工程學系
Keywords:	磺基甜菜鹼;界面活性劑;sulfobetaine silane;surfactant
Date:	2017-06-13
Issue Date:	2017-10-27 12:54:53 (UTC+8)
Publisher:	國立中央大學
Abstract:	本實驗將(N,N-Dimethylaminopropyl)trimethoxysilane和1,3-Propanesultone反應製備出雙離子型磺基甜菜鹼矽烷(Sulfobetaine silane，SBSi)，經水解縮合後將SBSi修飾在玻璃基材上，根據先前的實驗[1]，純溶液(除了二碘甲烷)皆會在此表面展現完全潤濕現象。根據文獻指出，雙離子型高分子水合能力很好，因此藉由改變環境溼度探討雙離子表面水分子數量是否受影響，並使用內聚力強且在SBSi表面上展現部分潤濕行為的二碘甲烷，將液體滴在不同環境濕度下的SBSi表面，利用影像式接觸角量測儀可以很明顯地觀察到接觸角的改變。SBSi表面的水分子含量不同也會影響自釘扎(self-pinning)液體的擴張面積。也探討了純溶液(水、正十六烷)在不同環境濕度下的擴張行為，在高濕度的環境下，液體在初始面積與初始擴張速度皆會較大，藉此得知表面水分子量越多，液體越容易向外擴張。另外，先前的文獻只探討了添加低(非)揮發性溶質水溶液在SBSi基材上的行為[1]，但並未討論過含界面活性劑液滴在基材上的行為，因此此篇論文會探討不同帶電性的界面活性劑液滴在SBSi表面上的行為。陽離子型界面活性劑會在表面產生去潤濕現象(Dewetting)；陰離子型和非離子型界面活性劑皆會產生fingering現象。而以上的現象只在含有水分子的SBSi上才會展現，且亦會隨著水分子數量的不同，而展現不同程度的fingering現象，然而在無水分子層的SBSi表面上則只會展現完全潤濕行為。 ;The total wetting surface which is a kind of zwitterionic surface is fabricated by grafting the sulfobetain silane (SBSi) on glass slices. It is considered that there is a water film on the surface because of highly hydrate chemical groups. It can be observed different contact angle with dropping diiodomethane on SBSi which is in different relative humidity (RH). With increasing the relative humidity, the contact angle is larger in the reason that diiodomethane is insoluble in water. The other indirect evident is that the maximum wetting area of water drops on SBSi surface grows because more equilibrium water molecules bring benefits to the spreading of liquid. In the same ambient, it is observed the enormously different behavior between wet and dry surface no matter which electric charge surfactant droplets drop on the SBSi surface. When the liquid droplets drop on the SBSi surface containing a water film in the atmosphere, the droplets show the different behaviors depending on the electric charge of surfactant. Experiments show that droplets of cationic surfactant on SBSi surface present the phenomena of dewetting, because surfactant ions would be adsorbed on the SBSi surface. However, the droplets tend to stick on the dry surface and the contact angle of drops is about 40. For the case of anionic and nonionic surfactant, it shows the fingering pattern on the wet SBSi surface and the wetting behavior on the dry one.
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] Electronic Thesis & Dissertation

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