The 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.