Dispersion Forces - Introduction Dispersion force arises because of the fluctuation in the polarizability. It is a temporary effect. The noble gases that don't form any chemical bonds are attracted to each other and condense to liquid form at low tempera
Van der Waals forces refer to the attractive or repulsive forces between molecules, atoms, or surfaces. These forces are caused by interactions between permanent or temporary dipoles in the molecules. Dispersion forces, on the other hand, are a type of van der Waals force that results from ...
The first type of dispersion of sound is produced by various causes. The instances of dispersion of sound associated with relaxation processes that occur during the passage of a sound wave are the most important. The initiating mechanism of relaxation dispersion of sound may be understood by using...
From a practical point of view, the new functional seems to be quite robust and it is thus suggested as an efficient and accurate quantum chemical method for large systems where dispersion forces are of general importance. 2006 Wiley Periodicals, Inc. J Comput Chem 2006doi:10.1002/jcc.20495...
The forces governing the dispersal of organisms are either vectorial (directed motion), that is, caused by wind, water, or some other environmental motion, or stochastic (random), as in the case of the change in seasons, which gives no indication of where the dispersing organisms may ...
London dispersion forces don't require a polar dipole molecule to be present and act in all materials, but they are usually exceedingly weak. The force is stronger for larger and heavier atoms with many electrons than for small atoms, and it can contribute to the physical characteristics of th...
Dispersion forces are not included in conventional density functional theory (DFT), which poses a challenge to the theoretical description of the interfacial properties of these molecules on solid surfaces. However, the inclusion of dispersion forces has been realized in recent developments of DFT9–...
There are a number of different possible outcomes: the droplets could stick and spread as a thin film of liquid, or bounce and breakup. This type of interaction between droplets and walls has been studied for application to internal combustion engines (e.g., Bai et al. (2002)) but it ...
shown that this process leads very quickly to adhesive bonding, so that after a few minutes strong forces are already transferred between the PVC film and the substrate; in a test they are often so high that they lead to material failure in the substrate. This rapid buildup of strength is...
comprising a physiologically acceptable medium containing at least one liquid fatty phase, a colloidal dispersion of particles that are solid at ambient temperature, and especially colored, and a dispersion of polymer particles that are surface-stabilized in the said liquid fatty phase with a ...