Abstract
Monte Carlo simulations in the grand canonical ensemble, the histogram reweighting technique, and finite-size scaling are used to study the phase behavior of monolayer films formed by various trimers on a square lattice. The multisite occupancy model is considered. The molecule is assumed to be a chain composed of segments A and B. The bonds between segments cannot be broken. We discuss three types of chains: BBB, ABB, and BAB. In all cases we analyze the behavior of molecules that have different shapes, namely, linear and L-shaped rigid rods and flexible trimers. The presented investigation shows that the chemical structure and geometrical shape of molecules can radically alter the phase diagram topology. The stable ordered structures have been found for some types of trimers. The structural transitions between disordered fluid and ordered fluid have been observed. The results reveal a great variety of vapor-liquid coexistence behavior depending on shapes of molecules and their chemical structure.
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