What is it about?
As a liquid droplet impacts on a surface it spreads up to a maximum diameter. This process is ubiquitous in nature but also crucial in many applications such as inkjet printing. We have studied this phenomenon for nanoparticle suspension droplets whose viscosity is not constant but changes with the deformation rate. We developed a model that predicts the maximum spreading diameter in terms of the droplet impact velocity, the fluid and the wetting properties.
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Why is it important?
The viscosity of the fluid is an important parameter governing the maximum spread of the droplet. However, for shear-thinning fluids such as graphene oxide suspensions, the viscosity decreases dramatically during the spreading process. We identified the relevant effective viscosity to predict the maximum spread for such fluids. This result is crucial for many applications where the fluid is a suspension and shear-thinning such as inks.
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This page is a summary of: Spreading of graphene oxide suspensions droplets on smooth surfaces, Physics of Fluids, November 2024, American Institute of Physics,
DOI: 10.1063/5.0231547.
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