
Interfacial Interactions in Dispersed Systems
Tematyka Badawcza
Research Topics
- kinetics of dynamic adsorption layer formation
- hydrodynamics of micro-objects in solutions of surface-active substances
- influence of dynamic adsorption layer on stability of liquid films under dynamic and static conditions
- kinetics of the three-phase contact formation at solid surfaces of different hydrophobicity and topography
- theoretical description of micro-objects dynamics and drainage of liquid films (Computational Fluid Dynamics, hydrodynamics models)
METHODS
- Ultra-fast video registration of micro-objects dynamics (high-speed cameras – up to 10 000 fps)
- Interferometric measurements of kinetics of drainage of thin liquid films under dynamic and static conditions
- Measurements of kinetics of the three-phase contact formation
- Measurements of interfacial tension using pendant drop or submerged bubble techniques (adsorption kinetics from 10 s to few hours)
- Measurements of dynamic Surface tension using maximum bubble pressure technique (adsorption kinetics from od 0.01 to 40 s)
- Measurements of contact angle
- Theoretical methods fordescription of dynamics of micro-objects and kinetics of liquid film drainage
- Digital Image Analysis
- Theoretical methods for describing the motion of micro-objects in a liquid and the kinetics of leakage of liquid films
MAIN ACHIEVEMENTS
- Elaboration of precise single bubble and single droplet generators, allowing control over an adsorption coverage at liquid/gas and liquid/liquid interface
- Determination, on the basis of quantitative mesurements of liquid film drainage kinetics, of influence of the dynamic adsorption layer on stability of foam films
- Determination of mechanism of synergistic effect observed in mixed solutions of Surface-active substances in two-phase (foams) and three-phase (flotation) systems
- Determination of influence of hydrophobic solid surface topography on hydrodynamic boundary conditions at the solid/liquid interface (experiments and numerical calculations)
- Determination of energetic profiles associated with the bubble collision with various interfaces in liquid