本研究藉由表面壓-分子佔據面積與表面電位-分子佔據面積等溫線的量測，以及Brewster angle 顯微鏡觀測技術，探討在氣液界面上陰陽離子界劑(catanionic surfactant)單分子層的行為。至於陰陽離子界劑單分子層，則是將具有不同碳鏈長度的陰離子及陽離子型界劑同時分佈在氣液界面上所形成的。
實驗結果顯示利用同時分佈的方式，可成功地在氣液界面上形成陰陽離子界劑單分子層。當陰離子或陽離子型界劑的碳鏈長度增加時，會形成較緊密的單分子層，且在壓縮單分子層的過程中，分子聚集domain的形成會變得更顯著，甚至單分子層的液相或液體-凝縮(liquid-condensed)相domains及崩潰結構的形態，均會受到影響。此外，當陰陽離子界劑單分子層崩潰時，出現摺疊的結構，則在單分子層壓縮-擴張迴圈中的分子損失會變得較不明顯。

This study investigated the monolayer behavior of catanionic surfactants at air/water interfaces by measurements of surface pressure-area and surface potential-area isotherms with Brewster angle microscopy observations. The catanionic surfactant monolayers at interfaces were prepared by cospreading mixed cationic/anionic surfactants with various hydrocarbon chain lengths.
The experimental results revealed that catanionic surfactant monolayers could be successfully formed at the interface by the cospreading approach. When the hydrocarbon chain length of anionic or cationic surfactants was increased, a more condensed monolayer was formed and the domain formation during monolayer compression became significant. In addition, the morphology of liquid or liquid-condensed domains and collapse structures of the monolayers were also strongly affected. Furthermore, when a folding structure was found for a collapse catanionic surfactant monolayer, the loss of monolayer-forming molecules during monolayer compression-expansion cycle became insignificant.

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