Study of nanobubbles on hydrophilic and hydrophobic alumina surfaces
| Autor: | Lisa Ditscherlein, Urs A. Peuker, Jörg Fritzsche |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Atomic force microscopy Capillary action Nanotechnology 02 engineering and technology Surface finish 021001 nanoscience & nanotechnology 01 natural sciences Contact angle Colloid and Surface Chemistry 0103 physical sciences Deep bed filtration Composite material 010306 general physics 0210 nano-technology |
| Zdroj: | Colloids and Surfaces A: Physicochemical and Engineering Aspects. 497:242-250 |
| ISSN: | 0927-7757 |
| DOI: | 10.1016/j.colsurfa.2016.03.011 |
| Popis: | Recent studies have shown that a high attractive force acts between poorly wettable surfaces, which cannot be explained by the conventional DLVO-theory. This hydrophobic force is caused by very small bridging bubbles. Such forces can improve the efficiency in deep bed filtration applications using hydrophobized filter materials. An atomic force microscope was used for the characterization of nanobubbles by investigating hydrophilic and hydrophobic Al2O3-substrates in water at 10, 20 and 30 °C. The nanobubbles were therefore imaged via intermittent mode AFM. Height and diameter distributions were represented as well as calculated microscopic contact angles for bubbles of various sizes. The results were compared with force measurements and the potential differences were discussed. Furthermore, the stability of nanobubbles on smooth and rough alumina surfaces with an increasing scan force was presented. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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