Accueil > Séminaires > Précédents séminaires > Particles and Droplets at Nanostructured Interfaces : Metastability and Thermally Activated Dynamics
Particles and Droplets at Nanostructured Interfaces : Metastability and Thermally Activated Dynamics
Carlos E. Colosqui Mechanical Engineering Dept., Stony Brook University
Our fundamental understanding of wetting, adsorption, and imbibition phenomena is embodied in classical mathematical descriptions (e.g., Young-Dupre, Young-Laplace, and Lucas-Washburn equations) that are derived under the assumption that interfaces are ideally smooth surfaces (e.g., planes, spheres, differentiable surfaces) separating perfectly homogeneous phases. Such idealization leads to the prediction of stable thermodynamic equilibrium states and neglects the presence of metastable states induced by diverse physicochemical heterogeneities. An increasing volume of experimental evidence indicates that the interplay between thermal motion and metastable states induced by nanoscale heterogeneities of solid/liquid interfaces can dominate the near-equilibrium dynamics of diverse colloidal and multiphase systems. In particular, this presentation will discuss recent experimental, theoretical, and computational studies of nano/microparticle adsorption at liquid interfaces, spontaneous droplet spreading, and nano/microcapillary imbibition. These systems exhibit a transition from dynamic regimes, dominated by hydrodynamic and capillary forces, to “kinetic” regimes governed by thermally activated transitions between metastable states. The presented results and proposed models suggest specific mechanisms by which combination of “system-level” geometry and nanoscale surface structure can alter the evolution of colloidal and multiphase systems.
Short Bio
Carlos Colosqui is an assistant professor in The Department of Mechanical Engineering and affiliated faculty in The Applied Mathematics and Statistics Department of Stony Brook University. He previously held postdoctoral positions at The Levich Institute for Physicochemical Hydrodynamics at CCNY-City University of New York and the Chemical and Biomolecular Engineering Department of Princeton University. His group currently performs theoretical, computational, and experimental research on wetting and interfacial phenomena in micro/nanoscale systems with support from the U.S. National Science Foundation and Office of Naval Research.
Dans la même rubrique :
- Materials for Sustainable Growth : OrganoSulfur and Sulfur Hybrids
- Smart Dynamic Casting
- Effets Non-Additifs dans l’Adhésion ‘Mixte’ / Mouillage et Evaporation Simultanés des Liquides
- Le treuil capillaire, un concept attrapé dans les toiles d’araignées
- Scanning Probe Microscopy of (Complex) Polymeric Systems : Beyond Imaging their Morphology !
- Simple model to describe adaptive wetting
- Synthesis and Rheology of Hydrophobically Modified Poly(vinyl alcohol) using Gallic Acid derivatives.
- Polymer Gels and NMR spectroscopy
- Fracture patterns in a thin layer of cohesive granular matter
- Designing ion-containing polymers for facile ion transport
- Étude par AFM du rôle de l’eau dans les mécanismes de fracture lente des verres.
- Evaporation d’une huile légère émulsifiée dans un fluide à seuil
- Réseaux Interpénétrés de Polymères pour l’élaboration de dispositifs électriquement stimulables.
- Engineering the interface of nanocolloids with polymers
- Homogeneous bulk, surface, and edge nucleation in crystalline nanodroplets
- Some aspects of capillary forces
- Tracer diffusion of particles in gels
- Simulation d’écoulements diphasiques newtoniens, rhéofluidifiants ou viscoélastiques
- Colloidal particles at interfaces : from model systems for dynamical studies to applications.
- Assemblage spontané de polymères chargés et d’oxydes lamellaires en suspension aqueuse