An investigation on the Mutual-Phobicity between Fluorocarbon and Hydrocarbon Surfactants by Atomic Force Microscopy
✍ Scribed by B.-Y. Zhu; P. Zhang; L. Wang; Z.-F. Liu
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 583 KB
- Volume
- 185
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
NOTE An Investigation on the Mutual-Phobicity between Fluorocarbon and Hydrocarbon
Surfactants by Atomic Force Microscopy individual phase areas that co-existed with each other, which is similar to that the individual micelles of single surfactants form in the mixed bulk Atomic force microscopy was used to investigate the mixed solution (1, 2). monolayer of FC-and HC-amphiphiles. Clear topographic images The phase separations in both monolayer and micelle formation are novel showing domain structure of the mixed monolayer and the data and interesting. However, they had been inferences based on the observaof the domain size have been provided. It is revealed that in the tions of macroscopic properties. Previously, we had no evidence on molecumixed monolayer the sodium octadecanesulfonate molecules conlar level in supporting the inference. struct the hexagonal domain dispersing in the continuous two-
The insoluble monolayer in proper conditions can be wholly transferred dimensional phase of perfluorononanoic acid. These results onto a solid substrate by Langmuir-Blodgett technique, and the atomic strongly support that, due to the mutual-phobicity between fluoforce microscopy (AFM) offers the possibility of imaging solid surfaces on rocarbon chain and hydrocarbon chain, there exists phase separaa molecular or atomic scale (15, 16). Therefore, the topographical features tion in the mixed monolayer of fluorocarbon and hydrocarbon and the phase structure of the insoluble monolayer can be observed directly.
In this work, the mixed insoluble monolayers of similarly charged FC-amphiphiles, albeit the p-A curves would obey the simple additive and HC-amphiphiles, which were the same in our previous work (6, 7), rule.