Theory 04/Adhesion
Gecko Grip Is Contact Splitting
The claim
Gecko adhesion is set by the ratio of contact splitting to surface roughness, so the same toe pads grip smooth glass and fail on a rough surface of matching scale.
01Mechanism
Adhesion comes from many small contacts; splitting raises the total force until the feature size approaches the surface roughness and contact area collapses.
02Predictions
- P1Grip should peak at a roughness matching the setal spacing.
- P2Setal density alone should mispredict.
03Refutation
Grip increasing monotonically with setal density would remove the roughness term.
04Why it resists the grid
It is a nanoscale mechanism expressed as an organismal capability, with no intermediate level where the claim can be tested cleanly.