DOI: 10.18150/n7ewjv
title: Near-continuous isotropic – nematic transition in compressed rod-like liquid crystal based nanocolloid

description: The results of pressure studies of a liquid crystal 5CB (4-Cyano-4'-pentylbiphenyl) and its nanocolloids doped with paraelectric BaTiO3 (0.1 and 1 wt%). Studies were focused on the impact of pre-transitional fluctuations and the emergence of complex, glassy-type dynamics. Results include pressure evolutions of such parameters as dielectric constant, primary relaxation times, DC electric conductivity, and also the real (ε’) and imaginary (ε’’) parts of dielectric permittivity as a function of frequency. The dataset contains:the results of broadband dielectric spectroscopy (BDS) measurements in the frequency range from 1Hz to 10 MHz (carried out using Novocontrol Alpha-A analyzer);polarized light microscopy (POM) photographs (carried out using Studar® Lab Pol microscope produced by PZO Mikroskopy and Canon EOS 6D Mark II camera).Both BDS and POM studies were conducted at a constant temperature T=353K on increasing pressure (from 0.1 MPa to about 500 MPa). The names of the individual files correspond to the numbering of the figures in the paper: Łoś, J., et al. "Near-continuous isotropic–nematic transition in compressed rod-like liquid crystal based nanocolloid." Journal of Molecular Liquids 382 (2023): 121844. Files included in this collection:FigA3.01. – Polarized light microscopy image of the isotropic and the nematic phases of compressed 5CB at clearing pressure.FigA3.02. – Polarized light microscopy image of the nematic phase of compressed 5CB 2 MPa above the clearing point.FigA3.03 – Polarized light microscopy image of the nematic phase of compressed 5CB in near nematic-solid phase transition pressure.FigA3.04 – Polarized light microscopy image of 5CB on compressing: the nematic–crystal transition.FigA3.05 – Polarized light microscopy image of the solid phase of 5CB.FigA3.06 – Polarized light microscopy image of the isotropic and the nematic phases of 5CB+0.1wt% of BaTiO3 nanocolloid at clearing pressure.FigA3.07 – Polarized light microscopy image of the nematic phase of 5CB+0.1wt% of BaTiO3 nanocolloid 1 MPa above clearing pressure.FigA3.08 – Polarized light microscopy image of the nematic phase of 5CB+0.1wt% of BaTiO3 nanocolloid 100 MPa above clearing pressure.FigA3.09 – Polarized light microscopy image of the nematic and the solid phases of 5CB+0.1wt% of BaTiO3 nanocolloid at crystallization pressureFigA3.10 - Polarized light microscopy image of the solid phase phase of 5CB+0.1wt% of BaTiO3 nanocolloid.Fig01 – Examples of BDS spectra—the real (ε’) and imaginary (ε’’) parts of dielectric permittivity as a function of frequency collected for 5CB and its nanocolloids under pressure. Results obtained during isothermal (T = 353K) compressing in isotropic liquid, nematic, and solid phases.Fig02-04 – Isothermal, pressure evolutions of dielectric constant in compressed 5CB and its nanocolloids with BaTiO3 nanoparticles. Results obtained during isothermal (T = 353K) compressing in isotropic liquid, nematic, and solid phases.Fig05 – Pressure evolutions of the ionic contribution to the dielectric constant in the isotropic liquid phase of 5CB and its nanocolloids. Results obtained during isothermal (T = 353K) compressing in isotropic liquid, nematic, and solid phases.Fig06 – Changes of the primary relaxation time in the nematic phase of 5CB and its nanocolloids with BaTiO3 nanoparticles obtained on compressing at T = 353 K.Fig07 – The normalized superposition of dielectric loss curves in the middle of the nematic phase (P = 240 MPa, T = 353 K) of 5CB and its nanocolloids with BaTiO3 nanoparticles.Fig08 – Test of the translational-orientational decoupling (DC electric conductivity versus primary relaxation time) in the nematic phase of compressed 5CB and its nanocolloids with BaTiO3.FigA1 – Pressure dependence of the clearing (isotropic-nematic phase transition) temperature and the extrapolated temperature of a continuous phase transition (T*).