Universal scaling of dielectric response of various liquid crystals and glass-forming liquids

New generalized scaling relationship accounting for both the real and imaginary parts of the complex dielectric permittivity data [1,2] will be presented. The generalized scaling procedure has been successfully used for various relaxation processes in numerous liquid crystal materials and glass-forming liquids (hydrogen-bonded and van der Waals) [1,2]. The fact that one obtains common master-curve for relaxations in liquid-like phases (isotropic liquid, cholesteric, nematic, smectic A), solid-like phases (smectic B, conformationally disorder crystal) as well as in supercooled liquid and plastic-crystal phases will be discussed. In supercooled disordered phases the main (alpha) relaxation process is often followed by the beta one or one deals with the excess wing phenomenon [3,4]. As it will be shown the behavior of beta relaxation process and/or excess wing phenomenon is governed by the alpha relaxation process and, moreover, all relaxation curves scaled according to the proposed relation tend to common behavior [2]. What is more, the presented scaling procedure can be applied to NMR data of longitudinal spin-lattice relaxation time, as well as for complex dielelctric modulus, impedance and admittance data. [1] M. Ga?a?zka, E. Juszyn?ska-Ga?a?zka, N. Osiecka, M. Massalska-Arodz?, A. Ba?k, J. Appl. Phys. 118, 064101-1-6 (2015). [2] M. Ga?a?zka, E. Juszyn?ska-Ga?a?zka, N. Osiecka, A. Ba?k, Phase Transitions 89, 341-348 (2016). [3] K. L. Ngai, J. Non-Cryst. Solids 275, 7-51 (2000). [4] C. Leo?n, K. L. Ngai, J. Phys. Chem. B. 103, 4045-4051 (1999).