Abstract
AbstractThe impact of different silica nanoparticles on rheology, interfacial tension and drop size distributions in liquid‐liquid systems is determined experimentally. The particles vary in wettability and specific surface area. In contrast to commonly used high‐energy devices for Pickering emulsion preparation, low energy input by stirring allows to quantify drop breakage and coalescence in steady state and dynamic conditions. The experiments can provide essential information for drop size model development in nanoparticle‐stabilized emulsions.
Highlights
Nanoparticles can be applied as emulsifying agents to stabilize liquid-liquid systems towards coalescence (Pickering emulsions) [1, 2]
It is crucial to understand the impact of particle characteristics such as shape, size and surface modification on their spatial arrangement at the interface, the drop size distributions and the resulting mass transfer [8]
To achieve a long-term stabilization of Pickering emulsions against coalescence, small droplet sizes are needed [9]. These are often realized by using high-energy dispersion units for emulsion preparation, such as ultrasonication or rotor-stator homogenizers
Summary
Nanoparticles can be applied as emulsifying agents to stabilize liquid-liquid systems towards coalescence (Pickering emulsions) [1, 2]. Due to the adsorption of nanoparticles at the liquid-liquid interface, coalescence is hindered or arrested, and smaller drop size distributions and a higher interfacial area can be achieved [3,4,5]. The higher interfacial area promotes mass transfer so that nanoparticles can be used as innovative additives for liquid-liquid reactions [6, 7]. To achieve a long-term stabilization of Pickering emulsions against coalescence, small droplet sizes are needed [9]. These are often realized by using high-energy dispersion units for emulsion preparation, such as ultrasonication or rotor-stator homogenizers. There still is a gap of knowledge concerning the detailed emulsification mechanisms [13]
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