van der Waals force

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van der Waals force

[′van dər ‚wȯlz ‚fȯrs]
(physical chemistry)
An attractive force between two atoms or nonpolar molecules, which arises because a fluctuating dipole moment in one molecule induces a dipole moment in the other, and the two dipole moments then interact. Also known as dispersion force; London dispersion force; van der Waals attraction.
References in periodicals archive ?
In fact, the addition of 5 phr of IL resulted in an increase of the conductivity at low frequency to around [10.sup.-8] S/m, but this value is significantly lower than that found for the ER/CNTMB containing 5 phr of IL, suggesting that IL interacts with the CNT surface through [pi]-cation [pi]-[pi] or van der Waals interactions. Being also ionically conductive, it can act as bridge between CNT particles and facilitates the charge transport, as also suggested by Zhao et al.
Due to the weakness of van der Waals interactions, their total interactions tend to be nondirectional.
S number Name Hydrogen bonds (<3.0 [Angstrom) 1 Reference Arg115, Met374 2 Compound 22 Thr310, Met 374 3 Hit1 Arg115, Met374 4 Hit2 Arg115, Met374 S number van der Waals interactions Alkyl/[pi]-alkyl interactions Phe134, Ile305, Ile133, Trp224, 1 Ala306, Asp309, Thr310, Trp224, Val370, Leu372, Leu477, Ser478 Val373 Phe134, Phe221, Trp224, 2 Asp309, Val374, Leu372, Ile133, Val370 Ser478 Ile132, Trp224, Ala306, Ile133, Phe134, 3 Ile305, Asp309, Thr310, Gly436, Cys437, Val369, Val370, Val373, Leu477 Ala438, Gly439 Ile132, Phe134, Phe148, Leu152, Trp224, Met303, Ile133, Phe221, 4 Ala306, Asp309, Thr310, Val370, Val373, Val369, Leu372 Phe430, Leu477 Gly431, Ser478 Table 5: Disease associations for query gene.
Caption: Figure 14: van der Waals interaction energy between mineral particles.
Huang, "A cohesive law for interfaces between multi-wall carbon nanotubes and polymers due to the van der Waals interactions," Science Direct, vol.
Weak intermolecular interactions such as hydrogen bonding, van der Waals interaction, dipole interaction, or metal coordination have been successfully displayed in supramolecular architectures [11-13].
Since van der Waals interactions are non-bonded, in comparison with covalent bonds between atoms, van der Waals interactions are very weak.
It is likely that in comparison with the conventionally conceived molecules, the resulting aromatic-quasi-alicyclic molecules are characterized by rather different, possibly even completely different non-covalent interactions between the molecules (chiefly van der Waals interactions), which then affect the retention characteristics.
In the calculation, the Hamaker constant for the particle-wall van der Waals interactions was chosen as 0.91 x [10.sup.-20] J (latex-NaCl-glass) (Hunter, 1981; Kang et al., 2004).
There are also a large number of van der Waals interactions. Unlike the oligosaccharide, the peptide does not bind deeply within a pocket in the groove-shaped binding site, and the excess space between the peptide and the bottom of the pocket is filled with three water molecules (compare Figures 2c and 2d).
The instrument records the deflection of the cantilever due to force interactions--for example Van der Waals interactions, ionic repulsion, or magnetic and electrostatic forces--to image the sample.