本研究旨在探討全潤濕性梯度表面上微液滴傳輸行為及其遲滯現象與黏著性之變化。首先運用靜電逐層組裝技術在玻璃基板表面製備出兼具透明及超親水二氧化矽奈米粒子薄膜，然後使用矽烷溶液藉由前進溶液法成功地在薄膜表面上創造出一全潤濕性譜 (從超疏水到超親水，接觸角：165° ~ 4°) 的梯度化表面，並觀察微液滴在此梯度表面上之運動行為。實驗結果顯示，奈米粒子薄膜表面雖然具有較大的接觸角梯度，但是並無法驅動微液滴；相較之下，平板玻璃潤濕性梯度表面雖然接觸角梯度較小，但卻足以驅動微液滴。此一現象促使本研究進一步探討奈米粒子薄膜及平板玻璃表面，由低至高的矽烷疏水改質程度下之遲滯現象及黏著性。由實驗結果得知，在平板玻璃上的遲滯現象及黏著性都較小且很相近；反觀在二氧化矽奈米粒子薄膜上則展現出先由小至大，再由大至小之極大的變化。本研究亦提出造成此一差異的可能機制。這些不同黏著性的表面，皆具有極大的應用價值。此外，超疏水/超親水楔型圖案化表面亦可成功地驅動微液滴自發性傳輸。

This work aims at studying transport of microdroplet and the variation of hysteresis and adhesion along total wettability gradient surfaces. An electrostatic layer-by-layer (ELbL) assembly process was utilized to fabricate transparent and superhydrophilic nanoparticulate thin films on glass substrate. After that, the transparent and superhydrophobic-superhydrophilic (contact angle: 165° ~ 4°) gradient surface with total wettability spetrum was successfully fabricated through advancing solution method with silane solution on the nanoparticulate thin film. Moving behaviors of microdroplet on wettability gradient surface of plain glass and SiO2 nanoparticulate thin film were then observed. Experiment shows the SiO2 nanoparticulate thin film exhibits larger gradient of contact angle, but it cannot drive microdroplet to transport. In contrast, although the plain glass has smaller gradient of contact angle, but it is enough to drive microdroplet to transport spontaneously. This phenomenon promotes further study of the variable hysteresis and adhesion on SiO2 nanoparticulate thin film and plain glass from low to high degree of silanization. From experimental results, both the hysteresis and adhesion are small and very simillar on palin glass. However, the hysteresis and adhesion exihibit extreme variation which goes through a maximum and drops off at higher degree of silanization on SiO2 nanoparticulate thin film. This work also proposes a possible mechanism for the difference. All of the surfaces with different adhesion have many potential applications. Furthermore, superhydrophobic/superhydrophilic wedge-shaped patterned surfaces were created and the spontaneous transport of microdroplet was successfully demonstrated.

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