van der Waals force


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van der Waals force

n.
A weak, short-range attractive force between atoms or molecules caused by their dipole moments, often arising in otherwise nonpolar atoms or molecules from a temporary shift of orbital electrons to one side of one atom or molecule.

[After Johannes Diderik van der Waals.]

van der Waals force

(văn′ dər wôlz′)
A weak force of attraction between electrically neutral molecules that collide with or pass very close to each other. The van der Waals force is caused by temporary attractions between electron-rich regions of one molecule and electron-poor regions of another. These attractions are very common but are much weaker than chemical bonds. The van der Waals force is what allows water vapor to condense into liquid water.
Translations
van der Waalsin voima
van der Waalskracht
van der Waalskraft
References in periodicals archive ?
These stacking faults occur because the material is held together by a weak force called the Van der Waals force, which is easily overwhelmed by the stress put on the materials during charging and use.
Based on our previous study, the connection force between CNT/CNT junctions was confirmed to be composed of van der Waals force, EBID fixing force, and chemical bonding force, respectively [28, 29].
The first aim of this project is to theoretically estimate the heat transport mediated by phonons transmitting across a vacuum gap via the Van der Waals force.
The real gecko foot hairs are scaled down to the nanometre level, with fibres so fine that significant bonding pressure can be achieved by taking advantage of the otherwise weak van der Waals force between molecules.
However, carbon nanotubes do not bond well to ceramic, and their interactions are due to van der Waals force, which is much weaker than covalent bonds.
In addition, CNTs connect with metal matrix by van der Waals force. Weak connection results in the big electric resistance and makes CNTs easily fall down from the substrate.
Taking a derivative of U (r) relative to r, an expression for the van der Waals force is obtained:
As the PPs are in a perpetual state of ZP agitation about their average "r" positions, however, there is a residual, random van der Waals force that the two PPs, and hence the PV as a whole, exert on the free mass.
There is abundant evidence that van der Waals force can draw particles together progressively more around the perimeters of interpartical contacts, but their role in compaction remains unanswered.
Nanotubes bind together into a strong rope because of the Van der Waals force they share.
The van der Waals force per unit area between two planar semi-infinite media separated by a distance D can be approximated by (Israelachvili, 1992):
Professor Antonia Kesel, head of the Bremen-based research group, said: 'One possible application of our research would be to develop Post-it notes based on the van der Waals force, which would stick even if they got wet or greasy.