Detachment of Rough Colloids from Liquid-Liquid Interfaces
| Autor: | Svetoslav E. Anachkov, Claudia Marschelke, Emanuele Marini, Lucio Isa, Ivan Lesov, Alla Synytska, Chiao-Peng Hsu, Michele Zanini |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
02 engineering and technology Surfaces and Interfaces Surface finish 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Pickering emulsion 0104 chemical sciences Adsorption Chemical physics Desorption Electrochemistry Surface roughness Surface modification Particle General Materials Science Pinning points 0210 nano-technology Spectroscopy |
| Zdroj: | Langmuir : the ACS journal of surfaces and colloids. 34(16) |
| ISSN: | 1520-5827 |
| Popis: | Particle surface roughness and chemistry play a pivotal role in the design of new particle-based materials. Although the adsorption of rough particles has been studied in the literature, desorption of such particles remains poorly understood. In this work, we specifically focus on the detachment of rough and chemically modified raspberry-like microparticles from water/oil interfaces using colloidal-probe atomic force microscopy. We observe different contact-line dynamics occurring upon particle detachment (pinning vs sliding), depending on both the particle roughness and surface modification. In general, surface roughness leads to a reduction of the desorption force of hydrophobic particles into the oil and provides a multitude of pinning points that can be accessed by applying different loads. Our results hence suggest future strategies for stabilization and destabilization of Pickering emulsions and foams. |
| Databáze: | OpenAIRE |
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