8th Liquid Matter Conference September 6-10, 2011 Wien, Austria ...

P7.104Thu 811:10-14:00A nonuiversal behavior of heteronuclear rigid trimers intwo-dimensional systemsWojciech Rzysko 1 and Malgorzata Borowko 11 M. Curie-Sklodowska University, Pl. M. Curie-Sklodowskiej 5, 20-031, Lublin,PolandMonte Carlo simulations in the grand canonical ensemble, the histogram reweighting and finite sizescaling are used to study the phase behavior of heteronuclear rigid linear trimers BAB adsorbedon a corrugated crystal surface with adsorption sites forming a square lattice. Phase diagrams forselected systems characterized by different parameters describing intermolecular interactions arepresented. We assume that AA and BB interactions are the same whereas a strength of interactionsbetween unlike segments is changed. We demonstrates that the phase diagram topology changeswith the system parameters. These phase diagrams can exhibit the presence of crititical, tricriticaland critical end points. The order-disorder transition between a disordered fluid and a smetic phaseis observed. We shows that this transition may occur via a continuous as well as a first-order phasetransition, depending on the model parameters. The fourth order cumulant of the order parameterand the critical exponents associated with the continuous transition are estimated. We study aninfluence of the energy of AB-interactions on the critical exponents. This phase transition is foundto be nonuniversal.104