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A droplet can deform a soft substrate due to capillary forces when they arein contact. We study the static deformation of a soft solid layer coated on arigid cylindrical fiber when an axisymmetric barrel-shaped droplet is embracingit. We find that the elastic deformation increases with decreasing rigid fiberradius. Significant disparities of deformation between the solid-liquid sideand the solid-gas side are found when their solid surface tensions aredifferent. When the coated layer is soft enough and the rigid fiber radius isless than the thickness of the coated layer, pronounced displacementoscillations are observed. Such slow decay of deformation with distances fromthe contact line position suggests a possible long-range interaction betweendroplets on a soft-layer-coated fiber.

Static wetting of a barrel-shaped droplet on a soft-layer-coated fiber