van der Waals force


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van der Waals force

(văn′ dər wôlz′, wälz′)
n.
A weak attractive force between atoms or nonpolar molecules caused by an instantaneous dipole moment of one atom or molecule that induces a similar temporary dipole moment in adjacent atoms or molecules.
References in periodicals archive ?
The only interaction between them is through van der Waals forces, which can be either an attraction force or a repulsion force.
when air invades to transform what we know as the wet stage to the moist stage, capillary forces--presumably capillary pressure forces of surface tension--deform latex particles and are more important than van der Waals force.
The van der Waals forces arise from dipole-dipole (Keesom), dipole-induced dipole (Debye) and/or instantaneous dipole-dipole (London) interactions.
Manifestations of the electromagnetic force range from the van der Waals forces of attraction between molecules and atoms to the postulated Casimir-Polder interaction between a neutral atom and an electrically conducting plate.
2] pressure should be sufficiently high so as to overcome these resistive forces caused by the surface tensions and van der Waals forces between the melted tin ball and the welding tip.
Again, the macroscopic manifestation of van der Waals forces appears as a disjoining pressure term in the governing equations.
For the low-affinity binding, due to H2 less than 0 (exothermal) and S2 less than 0 (entropy decrease), the interaction between zinc ion and HSA is mainly the van der Waals forces.
The TE model introduces the dimensionless numbers which consider the van der Waals forces of attraction in the interaction with particle thermal energy--the van der Waals Number (NvdW)--and the relation between the van der Waals forces of attraction and the fluid velocity in the interception of particle collision--Attraction Number ([N.
Van der Waals forces are typically seen when two very flat surfaces come in to contact with each other.
Over a decade ago, a pair of studies asserted that geckos owe their stickiness to van der Waals forces (SN: 7/15/00, p.
6) Dynamic pull-in instability of electrostatically actuated beams incorporating Casimir and van der Waals forces
Water derives many of its signature features from a combination of properties at the molecular level such as high polarisability, directional hydrogen bonding sites and van der Waals forces, the attractive or repulsive forces between molecules not related to covalent or ionic bonds.