Spreading of a thin droplet on a soft substrate

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Direct force measurement of microscopic droplets pulled along soft surfaces

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Summary: The dynamic changes of elastic deformation of soft substrates at a microscale and the decrease of force when the film thickness decreases were studied and explained. The relationship between dissipation intensity and film thickness was discovered.

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Summary: The passage discusses the process of a solid entraining a liquid film when withdrawn from a wetting liquid bath, which has applications in everyday life and industry. A new dip-coating model accounting for a soft solid layer is developed, leading to the discovery of a new softness-dependent power-law regime in the entrained liquid thickness.

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Gradient-dynamics model for liquid drops on elastic substrates

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Summary: This study introduces a simplified long-wave model to capture the main qualitative features of soft wetting, which can be applied to multiple droplets. The model successfully reproduces the double transition in equilibrium contact angles with increasing substrate softness, as well as the known relationship between dynamic contact angle and contact line velocity. It is found that the dominant coarsening mode changes with substrate softness in a nontrivial way.

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Model of spontaneous droplet transport on a soft viscoelastic substrate with nonuniform thickness

S. Tamim et al.

Summary: The study demonstrates a phenomenon called droplet durotaxis, where a droplet on a viscoelastic substrate of variable thickness undergoes spontaneous transport. This is caused by asymmetric deformation along the drop contact line, leading to a variation in contact angle and a net driving force on the drop. The resulting drop velocity is determined by balancing the work done by the moving drop with the viscoelastic dissipation of the substrate, showing qualitative agreement with previous experimental findings.

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Plateau-Rayleigh instability in a soft viscoelastic material

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Spreading and bistability of droplets on differentially heated substrates

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Inertial to Viscoelastic Transition in Early Drop Spreading on Soft Surfaces

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Spreading of a thin droplet on a soft substrate

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