本研究使用四碳醇、八碳醇及十二碳醇進行二氧化矽表面酯化反應，以製備出不同親疏水特性的粒子，並以其來探討奈米粒子單分子膜在氣液界面的行為及粒子LB膜的特性。結果顯示經八碳醇及十二碳醇改質的粒子具有較大的疏水性，其單分子膜具有類似的特性，膜壓-面積(π-A)等溫線的起始面積(lift-off point)較大，單分子膜具有較大的可壓縮性，薄膜崩潰時在阻隔棒附近有摺皺現象(folding)，而經四碳醇改質粒子的親水性大，等溫線的起始面積較小，曲線較陡，薄膜崩潰時無摺皺現象。此外，對於疏水性較強的粒子，由於在氣液界面上的凡得瓦吸引力較強，單分子膜受壓縮後的再分散性不佳，因此遲滯現象較明顯，但對親水性較佳的粒子，由於粒子與水分子間的作用力大，故再分散性佳。而實驗中亦發現粒子薄膜的均勻性主要受到粒子在溶液中的均一分散影響。經四碳醇改質之粒子其薄膜可以觀察到許多3-D聚集體，而八碳醇及十二碳醇改質之粒子薄膜則無此現象，判斷這些3-D結構即是粒子在溶液中分散不均勻所致。

　　將粒子單分子膜轉移至玻璃基板上以製備LB膜，並以SEM觀察其表面型態。實驗結果發現經四碳醇改質之粒子LB膜表面有較大的覆蓋率，此可歸因於粒子在水面上的較佳分散性，但粒子的親水性較強，在分散液中的分散性較差，故其LB膜上有較多的粒子聚集結構。相反的對八碳醇及十二碳醇改質過的粒子，其LB膜上的聚集結構較少，但因粒子間的凡得瓦吸引力大於水分子對其之分散力，LB膜上呈現有二維的聚集區，並有空洞產生。

　　Silica particles with different surface wettabilities were prepared by surface esterification with butanol, octanol, and dodecanol. Such silica particles were dispersed in chloroform and spread on the air/water interface to prepare the particle monolayer. The effects of surface wettability on the behavior of the particle monolayer and the characteristic of corresponding Langmuir-Blodgett film were studied. The results show that the particles modified by octanol and dodecanol have higher hydrophobicility than that modified by butanol. The monolyer of particles with higher hydrophobicility show the characteristics of large lift-off point, higher compressibility, and significant hysteresis. The LB films prepared by the more hydrophobic particles exhibit 2-dimentional (2D) aggregative domains with low ratio of surface coverage. Such properties can be attributed to the higher Van der Waals attraction among the particles comparing with the interaction between the particles and water subphase. The monolayer prepared by butanol-modified silica particles shows a contrary behavior due to the higher interaction of silica particles with water. The LB films of butanol-modified silica particles exhibit a more uniform morphology without 2D aggregative domains. However, 3D aggregative structure can be inspected on the LB film, which is probably due to the less dispersion condition of these particles in chloroform.

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