臺灣博碩士論文加值系統

摘 要本研究是藉由改變氣液界面上DPPC/長碳鏈醇單分子層的混合比例
及沈積表面壓，探討水在由其所製備的Langmuir-Blodgett (LB)膜表面的
接觸角變化情形。實驗結果顯示在表面壓25 mN/m時，不同DPPC/長碳鏈醇
混合比例和所製備LB膜表面的前進接觸角與組成之間並沒有關聯，而在表
面壓為35 mN/m 時，除純DPPC LB膜外，其他混合比例LB膜的前進接觸角
，則隨DPPC莫耳分率的增加而增加。此外，再將不同混合比例的DPPC/十
六碳醇溶液滴於鍺晶片上以形成薄膜，並利用紅外線光譜儀分析其表面分
子的排列位向，實驗結果顯示分子位向與表面間的夾角均大於50o,同時並
將十六、十八及二十碳醇等長碳鏈醇類的單分子層，在沈積表面壓為10
、20及25 mN/m時，製備成LB膜，其LB膜表面的潤溼性，結果顯示長碳鏈
醇類LB膜表面的潤溼性受碳鏈長度的影響很小，但隨沈積表面壓的增大而
增大，且在不同的乾燥環境下，水在其表面上的前進接觸角可從30度變化
到112度。

Abstract In this study, mixed DPPC/long-chain alcohol
Langmuir-Blodgett (LB) films were deposited at different surface
pressures, and the contact angles of water on the LB films were
measured by using a dynamic contact angle analyzer. The goal is
to investigate the effects of monolayer composition at the air/
water interface and deposited surface pressure on the
wettability of the LB film surface. The results show that
when the LB film is deposited at the surface pressure of 25 mN/
m, the monolayer composition has no effects on the advancing
contact angle of water on the LB film. However, at the deposited
surface pressure of 35 mN/m, the advancing contact angle
increases with the mole fraction of DPPC, except for the pure
DPPC LB film. Moreover, based on the FTIR analysis, one can
find that there is no relationship between the molecular
orientation and the wettability of the LB film. We also
prepare the LB films of long-chain alcohol and find that the
wettability of the LB film is not affected by the chain length,
but increases with deposited surface pressure. When the LB
films are dried under different conditions, the advancing
contact angle of water on the LB film surfaces can change
significantly from 30o to 112 o.