The fluctuation-driven dielectric properties of liquid crystalline 8OCB and its nanocolloids

The results of broadband dielectric spectroscopy (BDS) studies 4'-(Octyloxy)-4-biphenylcarbonitrile (8OCB, CAS no: 52364-73-5) liquid crystal and its colloids doped with paraelectric BaTiO₃ nanoparticles (diameter d = 50 nm, the cubic crystal system, nanoparticles concentrations: 0.4, 0.5, 1 wt%). The data was collected on cooling from 373.2 K to 273.2 K. Complex dielectric permittivity measurements were performed using two analyzers: Novocontrol Alpha-A analyzer in the frequency range from 1 to 10MHz and Keisight analyzer in the range from 1 MHz to 3 GHz. The results include frequency changes in the real (ε’( f )) and the imaginary (ε’’( f )) part of the complex dielectric permittivity, temperature changes of dielectric constant, loss curve maximum, relaxation time distribution parameters, and relaxation times.

The names of the individual files correspond to the numbering of the figures in the paper: Łoś, Joanna, et al. "The fluctuation-driven dielectric properties of liquid crystalline 8OCB and its nanocolloids." Soft Matter 18.24 (2022): 4502-4512. DOI: https://doi.org/10.1039/D2SM00105E

Files included in this collection:

Fig01 – dielectric spectra of 8OCB and colloids with 0.5% and 1% addition of BaTiO3 measured at 360 K, 345 K, and 330 K.

Fig02_03 – the dielectric constant as a function of temperature.

Fig04 – the loss curve maximum as a function of temperature.

Fig05 – m and n parameters, describing relaxation time distribution, as a function of temperature.

Fig06 – relaxation time as a function of reciprocal temperature.

Fig07_08 – DC conductivity as a function of relaxation time.

Fig09 – dielectric spectra measured in 8OCB+0.5%BaTiO3 sample at 370 K, 353 K, and 330 K.