Fig. 4
From: Humidity-tolerant rate-dependent capillary viscous adhesion of bee-collected pollen fluids
Influence of humidity-dependent viscosity changes on the macroscopic wet adhesive performance of the aqueous extract fluid. a Viscosity of the aqueous extract samples stored at different relative humidity levels (30, 57, and 75% RH for 3 days) as a function of shear rate at 20 °C. b Adhesion force due to the aqueous extract liquid bridge between two glass slides (as shown in red box, scale bar = 1 mm) as a function of separation rate and humidity. The error bars represent 95% confidence interval. c Schematic of the separation of two parallel flat surfaces joined by a liquid bridge. d Viscosity of the aqueous extract stored at different humidity levels as estimated by the wet adhesion model (Eq. (4)) by using the measured liquid-bridge forces (Fig. 4b)
