Journal
LANGMUIR
Volume 34, Issue 16, Pages 4861-4873Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.8b00327
Keywords
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Funding
- Swiss National Science Foundation [PP00P2_144646/1]
- Scientific Exchange Programme NMS.CH grants [Sciex 14.081, Sciex 14.082]
- Horizon project [692146-H2020-eu.4.b]
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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.
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