Extended Data Fig. 4: Wetting process with receding angle smaller than the initial contact angle in a hexagon chamber (θrec<90°).
From: Frictionless multiphasic interface for near-ideal aero-elastic pressure sensing
a, Illustration of a cross-section of the simplified wetting process in a hexagon chamber under varying liquid pressure when the receding angle is smaller than the initial contact angle (θ0, close to 90°). The background colours represent different regions of the process. A wetting cycle of loading and unloading pressure in a hexagon chamber was considered as four Regions (A-D) with five turning states (S1-S5). CL, contact Line. F, capillary force. The black arrows indicate the moving direction of the liquid. b, c, Relationship between the change of liquid pressure against the contact angle and contact area (or capacitance) during the wetting process. The red solid lines represent the first testing cycle. The blue dash lines represent the second testing cycle which shows a different response behaviour compared to the first cycle.
