By Stuart A. Rice
This sequence offers the chemical physics box with a discussion board for serious, authoritative reviews of advances in each sector of the self-discipline. quantity 129 within the sequence maintains to document fresh advances with major, up to date chapters via across the world well-known researchers.
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Extra resources for Advances in Chemical Physics 129
1. Generation of Film. Similar to the PFPE Z case, a three-dimensional (L Â M Â N) lattice is generated, where M is the direction of the periodic boundary condition in the simulation of spreading process. Then, a film of several layers with random orientation of spins is deposited on the substrate. 30(a). 2. Relaxation of the Spin System. After the film is deposited, the interactions are turned on between the spins as well as between the spin and the substrate. For each MC cycle, the molecules are interrogated randomly as to whether their spins flip.
SRS Model Here, we adopted a spin analogy/lattice gas model, or SRS model, as shown in Fig. 28(a), which represents an oversimplified molecular structure yet still captures the essence of the molecule–surface interactions for describing SME profiles. Similar techniques using the Ising model to study other physical systems have been investigated [148,149,160]; however, none of the literature deals with the simulation of PFPE lubricant dynamics described here. MC simulations based on the SRS model were pioneered by Ma et al.
After the system is relaxed, spreading commences. The procedure is similar to that in the simulation of PFPE Z molecules; the only difference is that the interactions among endgroups and between endgroups and substrate are included. Each movement of a molecule includes a change of position as well as a flip of spin, which depends on whether it is energetically favorable. Each MC step randomly interrogates every molecule exactly one time. The movement of an interrogated molecule depends on whether the projected site is empty and whether a favorable system energy change is associated with the movement.