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The study investigates the impact of mechanical compression on the structure and stability of highly porous nanoparticle layers, aiming to broaden their application from gas to liquid environments. It explores the capillary rising process within these layers through imbibition measurements, allowing for an estimation of detaching forces and layer stability during imbibition. A novel two-step layer transfer process is introduced, featuring a low-pressure lamination step. Findings indicate that increasing lamination pressure shifts the pore size distribution towards smaller pores and enhances particle-particle contact points, significantly boosting the layer's resistance to elastic deformation. To assess the stability of the layers during imbibition, capillary rising experiments approximate the forces acting on the nanoparticles. Results reveal deviations from classical capillary rising theory, prompting the development of a new model tailored for the complex pore structures of these layers. Particle removal measurements highlight that capillary forces primarily influence layer stability, while friction forces contribute to the detachment of particles. Overall, the research demonstrates that mechanical compression can effectively stabilize highly porous layers for use in liquid environments.
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Highly porous nanoparticle layers from the gas phase - stabilization through mechanical compression to withstand capillary forces during imbibition, Sven O. Schopf
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- Année de publication
- 2018
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