Grup de Propietas Físiques dels Materials (GRPFM), Departament de Física i Enginyeria Nuclear, E.T.S.E.I.B. Universitat Politècnica de Catalunya, Diagonal, 647 08028 Barcelona, Spain.
J Phys Chem B. 2009 Dec 10;113(49):15967-74. doi: 10.1021/jp906105u.
An exhaustive analysis of the critical behavior of the nematic to isotropic (N-to-I) phase transition on the liquid crystal hexyloxycyanobiphenyl (6OCB) has been performed. To do so, the accurate evolution of various physical magnitudes (static dielectric permittivity data together with specific heat and volumetric determinations) around the N-to-I transition has been required. The specific heat data with the isobaric thermal expansion coefficient and the derivative of the static dielectric permittivity with temperature have been proven to be related to each other by a scaling relationship. However, some discrepancies have been observed for the dielectric data in relation to such a scaling relationship and the critical behavior of the N-to-I phase transition. All information has been used to get some insight on the strength of the first-order N-to-I phase transition of the 6OCB in relation to the other counterparts in the nOCB series of compounds.
对向列-各向同性（N-I）相转变的临界行为进行了详尽的分析。为了实现这一目标，需要对各种物理量（静态介电常数数据以及比热容和体积测定）在 N-I 转变周围的精确演变进行分析。已经证明，比热数据与等压热膨胀系数以及静态介电常数随温度的导数之间存在标度关系。然而，在与这种标度关系和 N-I 相转变的临界行为有关的介电数据方面，观察到了一些差异。所有信息都被用来深入了解 6OCB 的一阶 N-I 相转变相对于 nOCB 系列化合物中的其他化合物的强度。
