Hello,
I have a system of amorphous silica and platinum nanoparticle. I will be performing molecular dynamics (MD) simulations on this system. While I have one interatomic potential for silica and another for platinum but I do not have anything for describing the interaction between Silica and platinum. I am trying to use Lennard Jone's (LJ) potential for these interactions (Si-Pt, Pt-O). Can anyone suggest to me where can I get the LJ parameter? I searched literatures but yet could not find an MD paper on the same system. Also if you have any other source for other interatomic potentials instead of the hybrid potentials for this system, please share.
The L-J potential won't apply because you aren't dealing with single molecules. You should read about London dispersion forces and the Hamaker constant. Generally, the attractive force decays much more slowly between large assemblies of molecules (e.g., particles) than for isolated molecules. It is also dependent on the crystal structure - e.g., the values of the parameters used to describe the attractive force between two amorphous silica particles will be different that between two quartz particles of the same size.
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