Dropwise deposition and wetting of nanoparticle suspensions
| Autor: | Dimos Poulikakos, Mathias Dietzel, Nicole R. Bieri |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Fluid Flow and Transfer Processes
Materials science Mechanical Engineering Nanoparticle Condensed Matter Physics Suspension (chemistry) Physics::Fluid Dynamics Condensed Matter::Soft Condensed Matter Surface tension Colloid Deposition (phase transition) Particle Wetting Composite material Navier–Stokes equations |
| Zdroj: | International Journal of Heat and Fluid Flow. 29:250-262 |
| ISSN: | 0142-727X |
| Popis: | The wetting and spreading behavior of micron-sized colloidal nanoparticle suspension (‘nanoink’) droplets upon deposition on a flat substrate is investigated experimentally and numerically and compared to the behavior of the pure liquid solvent. Toluene containing gold particles is used as a reference working liquid, deposited either on a copper or a glass substrate. The experiments undertaken with a high-speed camera record the dynamic impact and spreading process and the results are used to calibrate a numerical model based on the Navier–Stokes equations in Lagrangian coordinates. The model accounts for wetting and the motion of a representative number of computational particles according to the relevant form of Newton’s second law. The presence of the particles reduces spreading up to about 30%. The simulation using the particle model suggests that recirculation flow patterns during oscillatory recoiling phases lead to a particle pre-structuring in the vicinity of the substrate, providing an additional mechanism for the development of the characteristic trough shape encountered during the drying of printed colloidal suspension droplets. |
| Databáze: | OpenAIRE |
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