The Dominance of Pretransitional Effects in Liquid Crystal-Based Nanocolloids: Nematogenic 4-methoxybenzylidene-4′–butylaniline with Transverse Permanent Dipole Moment and BaTiO3 Nanoparticles

The results of broadband dielectric spectroscopy studies of 4-methoxybenzylidene-4′–butylaniline (MBBA) liquid crystal and its colloids doped with paraelectric BaTiO3 nanoparticles (diameter d = 50 nm, the cubic crystal system, nanoparticles concentrations: 0.01, 0.05, 0.1, 0.5, 1 wt%). The data was collected on cooling from 360 K to 123 K. Complex dielectric permittivity was measured in the frequency range from 1 Hz to 10 MHz using the Novocontrol Alpha-A analyzer. The results include frequency changes in the real (ε’( f )) and the imaginary (ε’’( f )) part of the complex dielectric permittivity, temperature changes of loss tangent (tan(δ)), relative changes in the dielectric permittivity (∆ε’(f)=ε’(f)-ε’(116 kHz)) and DC conductivity (σ). The files included in this collection are:Fig_1-3_A1.txt – dielectric spectra – complex dielectric permittivity vs frequency (ε’( f ), (ε’’( f ))Fig_4-8.txt – the dielectric constant vs temperature (ε(T))Fig_9-11.txt – relative changes in the dielectric permittivity vs temperature (∆ε’(f,T)=ε’(f,T)-ε’(116 kHz,T))Fig_12-13.txt – DC conductivity vs temperature (σ(T)).Fig_14-16.txt – dielectric spectra– loss tangent vs temperature (tan(δ)(T))