ABSTRACT
This chapter reviews some progress of the studies on frictional properties of various shape-tunable wrinkles. Living matters such as animals, insects, and plants exhibit a wide variety of soft textured surfaces. The asperities of the textured surfaces contribute to their tribological properties, for example, adhesion, lubrication and friction. The wrinkles on the surface of an animal’s body are a familiar example; the relatively hard skin supported by the soft inner tissue can wrinkle under compressive stress. The surface of a paved road may wrinkle because of the expansion of the top hard surface as it heats up in strong sunlight. Microwrinkles are fabricated using a thin film, typically several tens of nanometers thick, which is supported by a relatively soft substrate. The wavelength of the wrinkles is determined by the thickness of the hard film and the mechanical properties of the hard film and the soft substrate.
