Figure 2.

Fluid secretion volume of pads in stationary contact with glass. (a) 100× IRM image of the adhesive contact zone (Nauphoeta cinerea) in contact, showing hydrophilic droplets (asterisks) and a wedge of hydrophobic fluid at the edge of the contact zone. The dotted line indicates the position of the line plot. (b) Intensity (relative to the background) along the line shown in (a). Positions of the interference maxima and minima are indicated by arrows. (c) Reconstructed cross section of the fluid wedge. Arrows correspond to the positions marked in (b). (d) Comparison of the increase in wedge area during stationary contact in stick insects (solid line, C. morosus, n = 6) and cockroaches (dashed line, N. cinerea, n = 4).