Complexing Properties of Ionic Clay Silicate Platelets and Cationic Surfactants
Date Issued
2007
Date
2007
Author(s)
Chen, Wei-Ting
DOI
zh-TW
Abstract
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.
Subjects
脫層劑
奈米矽片
界面活性劑
臨界微胞濃度
表面張力
exfoliating agent Nano
Silicate Platelets
surfactant
critical micelle concentration
surface tension
Type
thesis