2016年5月18日 · The Casimir effect and the Van der Waals force between two conducting plates are one and the same thing. To see this, consider the boundary conditions postulated for the Casimir effect. The electric field has to be exactly zero at the plates.

2016年8月30日 · The van der Waals force is a well-understood physical phenomena, as are electrostatics.When particles get down to a nanoscale size and separation, van der Waals forces can be very strong and become a dominant force for causing particles to adhere to each other to surfaces or each other.

2015年6月10日 · The van der Waals' forces are very weak. I said the hydrogen bond is extremely strong, but that is only compared to the other van der Waals' forces. Compared to say, a covalent bond, a hydrogen bond is approximately one tenth of that strength. The dipole-dipole bond is weaker still, and the dispersion forces are the weakest of Van De Waals' forces.

2021年6月1日 · There are two kinds of Van der Waals forces: weak London Dispersion Forces and stronger dipole-dipole forces. The obvious question is why is gravity not counted as a Van der Waals force, to which the obvious answer is that at the molecular level gravity is so weak it is not worth considering.

2024年5月28日 · On the Wikipedia article on van der Waals force, one of the contributions to intermolecular forces is. A repulsive component resulting from the Pauli exclusion principle that prevents close contact of atoms, or the collapse of molecules. Firstly, this only explains fermions. If the atom is a boson, it doesn’t apply.

the Casimir force is simply the (relativistic, retarded) van der Waals force between the metal plates. Another interpretation of Casimir force is that it is due to quantum vacuum. That same vacuum is said to produce inertia, according to. Inertia as a zero-point-field Lorentz force, Bernhard Haisch, Alfonso Rueda, and H. E. Puthoff, Phys. Rev

I came to know that the friction force actually depends on the surface contact area due to weak interactions (adhesion due to Van der Waals forces) between the atoms of both materials increasing in number with an area increase.

2019年6月26日 · Van der Waals force and hydrogen bonds only try to keep minimal surface (i.e. as spherical as possible). It's only gravity that tries to keep the minimal thickness of the water (as long as we neglect the attraction between the liquid and the solid surface it lies upon, otherwise there would be a fourth force).

Remark: the previous derivation assumes that the interactions travel at infinite speed which is not true. When the limitation of the speed of light is introduced then at large distances, the van der Waals interaction decays as $1/r^7$.

2015年6月8日 · The question is whether two stainless steel disks are susceptible to this. Other materials adhere to stainless steel via the van der Waals force, so it may be possible. However, the van der Waals force is very weak, and the mass of the disks, even at .025 inch thickness, might be too great for the surface areas to adhere.