the VDW interactions would be strong enough to hang a 200 pound weight from a single Gecko toe To learn more about Geckos and Van der Waals interactions you may want to look at: Autumn, Sitti, Liang et al Evidence for van der Waals adhesion in gecko setae PNAS, 99, pp 12252-12256 (2002)
Van der Waals forces are relatively strong compared to thermal energy The rule of thumb is, that Hamaker constant is within 1k BTroom to 100k BTroom for most materials interacting across vacuum and lower for non-vacuum intermediate media An interesting estimation for strength of van der Waals forces is the case of fly on the ceiling
the strong van der Waals vdW interactions between the molecule and the surface The role of van der Waals forces in surface diffusion has been explicitly demonstrated II METHODS A Experimental KBr 001 surfaces with monolayer deep rectangular pits were prepared by cleavage in ultrahigh vacuum UHV ,
The van der Waals Model The main reason for the transformation of gas into liquid at decreasing T and (or) increasing P-interaction between the molecules ()V Nb Nk T V N a P ?? ? = B ? ? ?? ? ? + 2 2 eff = ? V V Nb 2 2 V N a eff P P = + the strong short-range repulsion: the molecules are rigid: P ??as soon as the
ArBRAcTr Biological systems can experience a strong van der Waals interaction involving electromagnetic fluctuations at the low frequency limit In lipid-water
the strong interaction: nuclear interaction (holds protons neutrons in the nucleus together by attractive intermolecular forces ( van der Waals forces) w r A
which is a solid; it can exist as liquid; or it can exist in the gaseous strong type of dipole-dipole interaction is about different types of van der Waals forces
The van der Waals force p Bolye V=NkT Coefficient a≥0, p vdW ≤p Bolye because of attractive forces; Volume of particles, b≥0 1660 Boyle's law (p vdW
2012 Pearson Education, Inc Chapter 11 Intermolecular Forces the particles – The strength of the attractions between the particles van der Waals forces