Objectives:
To develop a novel method and instrument for investigation of the bulk and surface rheology of suspensions in non-equilibrium state, characterized by strong mechanical perturbations. To determine the interaction potential between nanoparticles of different sizes and charge densities using a light scattering technique.
Expected Results:
– experimental data on particles interactions;
– an experimental setup for rheological measurements of interfaces under vibrations;
– a theoretical dispersion equation needed for interpretation of the results of measurements;
– experimental data for bulk and surface rheological properties of complex multiphase liquids;
– interaction potentials between nanoparticles to be used in model of ESR1
- Adsorption of Dispersions of Silica Nanoparticles and anAmphiphilic Triblock Copolymer at Water‐Vapor Interface
This study is about the surface modification of hydrophilic silica nanoparticles by
non-chemical adsorption of an amphiphilic triblock copolymer (Pluronic F-127)
and its influence on surface tension and interfacial rheology. As copolymer
concentration increases, we observed an increment of the hydrodynamic diameter
and a reduction of the effective charge of the complexes. The presence of silica, at
low Pluronic F-127 concentration, increases surface tension and affects the
rheology: those results suggest that silica particles hinder Pluronic F-127
molecules reorganization at the interface, with subsequent increase in foam
stability.