本研究旨在運用犧牲粒子的概念，以疏水的鐵氟龍(Teflon)高分子奈米膠體粒子搭配不同體積分率的聚苯乙烯/二乙烯苯共聚物(PSDVB)做為微米犧牲粒子，創造超疏水的Teflon表面並開發其應用。本文利用三種不同的塗佈方法，包括浸鍍、刮刀塗佈及網版印刷，分別將Teflon/PSDVB膠體粒子溶液塗佈於玻璃基板上，經290℃燒結Teflon粒子並犧牲掉PSDVB粒子，藉由產生孔洞結構和表面粗糙度，創造出超疏水的Teflon表面。實驗結果顯示，當PSDVB占體積分率為0.65時，可得到一最佳超疏水表面，水滴前進接觸角可高達175°，接觸角遲滯則可小於5°。與單純的Teflon表面相較，具有更好的超疏水特性。本文亦嘗試由所製備的Teflon表面的表面形貌、表面粗糙度及表面潤濕性，建立其間的關聯。此外，本文也成功地以網版印刷的方式印製兩種實驗室晶片的微流道圖案即：介電潤濕 (Electro-Wetting-on Dielectric, EWOD)超疏水微流道及楔形(wedge-shape)超疏水/超親水微流道，期能提升實驗室晶片的效能及實用性。

This work aims at creating the superhydrophobic Teflon surfaces through sacrificial particle approach and developing the potential applications of these surfaces. Suspension mixtures of colloidal Teflon nanoparticles and poly(styrene-co-divinylbenzene) microparticles with various volume fractions (φ) in the range of 0 to 0.8 were prepared and applied to glass substrate by three coating methods. After sintering of Teflon colloids and degrading of PSDVB at 290 ℃, the resulting surfaces were subjected to characterization by SEM, AFM/α-step, and contact angle analyses. A maximum advancing contact angle as high as 175° and a minimum contact angle hysteresis less than 5° was exhibited by the surface which was prepared with φ=0.65. This surface is obviously much superior to that prepared without using sacrificial particles in superhydrophobicity. The relationship between surface morphology, roughness and wettability was examined and correlated. Furthermore, the fabrication of superhydrophobic EWOD microchannel and superhydrophobic/superhydrophilic wedge-shape microchannel on glass substrate by screen printing method was successfully demonstrated. This may find applications in lab on a chip technology.

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用專專刊,2009年台灣化學工程學會,第五十六卷第四期