Cover Image, Volume 49, Issue 3


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Inspired by examples from nature such as the hierarchical features on a gecko's foot, topological patterns have been used on the surfaces of many synthetic materials to control adhesion. It has been shown that such patterns either increase or decrease adhesion compared to that of the smooth surfaces, but most studies so far have looked at planar surfaces. On page 179 of this issue, Santanu Kundu and colleagues study the effect of surface wrinkles on a spherical surface on adhesion and develop a model to describe their findings. Compared to planar surfaces, where adhesion is determined by the total length of the contact line, they find that adhesion of non-planar wrinkled surfaces depends on the cumulative effect of the radius of curvature of the curved surface, and the wavelength and the amplitude of the wrinkles.