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[en] Highlights: • The effect of nanoparticles on the transitions is discussed. • The nanoparticles dependence of the transition tempearture is calculated. • The tricritical behavior of the transition is discussed. Experimental studies have shown that nanoparticles play an important role on the rotator phase transitions of n-alkanes. A phenomenological model for predicting the phase transitions in mixtures of alkanes and nanoparticles has been proposed by combining Flory-Huggins free energy of isotropic mixing and Landau free energy. The impact of nanoparticles on the phase transitions and their transition temperatures is discussed by means of phenomenological theory. The possibility of the tricritical behavior of the phase transition in the mixtures of alkanes and nanoparticles is discussed. The theoretical predictions are in good qualitative agreement with available experimental results.