離子性之層狀黏土與陽離子界面活性劑之複合性質

Abstract

使用本實驗室研發的聚醚胺當做脫層劑，製備脫層的矽酸鹽片，而片徑為80 × 80 × 1 nm3 的矽酸鹽片，在transmission electron microscopy (TEM)和dynamic force microscopy (DFM)下觀察呈現出多邊形的形狀高片徑比例，且每片矽酸鹽片的表面上擁有高密度的電荷特性。 在本實驗中，是使用陽離子型、陰離子型與非離子型之界面活性劑，在臨界微胞濃度(critical micelle concentration, CMC)下加入矽酸鹽片，以測量空氣/水的表面張力探討界面活性劑與矽酸鹽片之間的作用力，並且以氣泡產生的體積高度與Zeta Potential加以印證，結果顯示在不同類型界面活性劑與NSP的作用力比較是陽離子型＞ 非離子型＞ 陰離子型界面活性劑。另一部分的實驗是以聚乙烯二醇(polyethylenen glycol, PEG)，在加入矽酸鹽片後所產生PEG的結晶溫度(Tc)變化，結果顯示可以使PEG400結晶溫度從-19 oC上升到-2 oC的提昇。

Exfoliated Silicate Platelets are prepared by using a polyamine exfoliating agent, in our research group. The silicate platelets are in a dimension of approximately 80 × 80 × 1 nm3. The platelets are observed to be polygon shape by transmission electron microscopy (TEM) and round bent-leaf shape by dynamic force microscopy (DFM). Individual platelets are of high-aspect ratio and ionic character. In this work the surface tension of cationic surfactants, anionic surfactants, nonionic surfactants in interacting with the silicate platelets was measured at air/water interfaces by critical micelle concentration (CMC), as well as their foam height, and zeta potential. The result shows the adsorption between surfactant and the platelets in the order of cationic ＞ nonionic ＞ anionic surfactants. It was also investigated that crystalline temperature changes of polyethylene glycol (PEG) when complexing with silicate platelets, raising the PEG400 Tc to 19 oC from -21 to -2 oC.