Gecko toes have special adaptations that allow them to* adhere to most surfaces without the use of liquids or surface tension. About 60% of gecko species have adhesive toe pads; such pads have been gained and lost repeatedly over the course of gecko evolution.[14] (Gecko - Wikipedia) Adhesive toepads evolved independently in about 11 different gecko lineages and were lost in at least 9 lineages.[14] (Gecko - Wikipedia) The spatula-shaped setae arranged in lamellae on gecko footpads enable attractive van der Waals’ forces *between the β-keratin (Beta-keratin - Wikipedia) lamellae/setae/spatulae structures and the surface.[15] (Gecko - Wikipedia)[16] (Gecko - Wikipedia) These van der Waals interactions involve no fluids; in theory, a boot made of synthetic setae would adhere as easily to the surface of the International Space Station as it would to a living-room wall, although adhesion varies with humidity.[17] (Gecko - Wikipedia)[18] (Gecko - Wikipedia) The setae on the feet of geckos are also self-cleaning and will usually remove any clogging dirt within a few steps.[19] (Gecko - Wikipedia)[20] (Gecko - Wikipedia) Teflon, which has very low surface energy,[21] (Gecko - Wikipedia) is more difficult for geckos to adhere to than many other surfaces.
In physical chemistry, the van der Waals force (or van der Waals’ interaction), named after Dutch scientist Johannes Diderik van der Waals, is the sum of the attractive or repulsive forces between molecules (or between parts of the same molecule) other than those due to covalent bonds or the electrostatic interaction of ions with one another or with neutral molecules or charged molecules.
Van der Waals forces include attractions and repulsions between atoms, molecules, and surfaces, as well as other intermolecular forces. They differ from covalent and ionic bonding in that they are caused by correlations in the fluctuating polarizations of nearby particles (a consequence of quantum dynamics[3] (Van der Waals force - Wikipedia)).
"I may not be a chemical structure expert, but from the molecule name, molecular weight, and the little Vander Waals 3d visualization, P75 looks like it’s pretty far from AndrostA and AndrostE anything."
