本研究分別使用alkyltrimethylammonium bromide含C8、C12和C16的陽離子型界面活性劑來修飾二氧化矽粒子表面，再探討奈米粒子單分子膜在氣液界面的行為。之後以LB (Langmuir-Blodgett)方式沈積粒子薄膜，再經由silane改質使表面呈疏水性，最後探討在不同層數和粒子大小組合下，其潤溼的效果。

　　結果顯示，在不同碳數的界劑修飾下，等溫線都有陡峭的膜壓曲線，小範圍的遲滯現象，以及高度穩定的鬆弛行為。這些特性顯示粒子和水分子間的作用力大，粒子在氣/液界面分散性佳，沒明顯聚集產生。將粒子薄膜轉移到玻璃基板上，並由SEM觀察其表面型態。發現以物理改質的方式，可以得到覆蓋率大且緊密排列的均勻薄膜，而且用不同碳數的界劑修飾，所得的結果相近。

　　在表面潤溼性上，單一粒徑的粒子所組成的粒子膜，在其表面做疏水改質後，可得到超疏水角度(θA約為160°)，但其遲滯現象(滑動角，α> 40°)則偏高。不過若在單一粒徑的粒子膜上再多沈積一層更小粒徑(50nm)的粒子膜，所得的潤溼效果，不只是再提高超疏水角度，連遲滯現象也有明顯的改善(α<20°)。

　Silica particles are hydrophobilize by physical adsorption of cationic surfactants, alkyltrimethylammonium bromide. The effects of surface modification, as well as the length of alkyl chain, on the monolayer behavior of silica particle at the air/water interface, and the packing structure of the particulate films are studied first. The particulate films were then used to prepare superhydrophobic surfaces by surface modification an alkyl silane monolayer. The results show that the particle modified by adsorption of ionic surfactants have an amphiphilic property at the air/water interface. Such monolayer exhibits low compressibility, low hysteresis, higher re-spreading characteristic, and low collapse pressure. The LB films of silica particles exhibit an uniform morphology and closely-packed structure. The wettability of the particulate films based on the surface structure of silica particles of single size exhibit a high advancing contact angle (θA) to the water (θA≒160°), but with high hysteresis. When the film structure is constructed by particles of multiscale, with particles of small size assembled on large ones, a surface with high contact angles and smaller hysteresis can be prepared.

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