Department of Physics, Presidency University, 86/1 College Street, Kolkata 700 073, India.
J Chem Phys. 2011 Oct 7;135(13):134505. doi: 10.1063/1.3646213.
A phenomenological theory is presented, which describes the tricritical behavior of the R(I)-R(V) rotator phase transition in the mixture of alkanes with nanoparticles. The influence of the nanoparticles on the R(I)-R(V) transition in alkanes is discussed by varying the coupling between the order parameters of the rotator phases and nanoparticle. When nanoparticle solutes are added to pure alkanes, the R(I)-R(V) transition temperature is increased. It was observed from the theoretical calculations that for a particular value of the concentration of the nanoparticles, the first order R(I)-R(V) transition becomes second order at a tricritical point. Calculations based on this model agree qualitatively with experiment.
提出了一个唯象理论，描述了纳米粒子混合物中环烷烃的 R(I)-R(V) 旋转相相变的三临界点行为。通过改变旋转相序参数与纳米颗粒的耦合，讨论了纳米颗粒对烷烃中 R(I)-R(V)转变的影响。当纳米颗粒溶质添加到纯烷烃中时，R(I)-R(V)转变温度升高。从理论计算中观察到，对于纳米颗粒浓度的特定值，在三临界点处，一阶 R(I)-R(V)转变变为二阶转变。基于该模型的计算与实验定性相符。
