Near-continuous isotropic – nematic transition in compressed rod-like liquid crystal based nanocolloid

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*).

液晶5CB（4-Cyano-4'-pentylbiphenyl，4-氰基-4'-戊基联苯）及其掺杂顺电钛酸钡（BaTiO3）纳米颗粒（质量分数为0.1%和1%）的纳米胶体的压力研究结果。研究聚焦于预转变涨落（pre-transitional fluctuations）的影响及复杂玻璃态动力学（glassy-type dynamics）的出现。结果包括介电常数、主弛豫时间、直流电导率等参数的压力演化规律，以及介电常数实部（ε'）和虚部（ε''）随频率的变化关系。数据集包含：1Hz至10MHz频率范围内的宽带介电谱（broadband dielectric spectroscopy, BDS）测量结果（使用Novocontrol Alpha-A分析仪完成）；偏振光显微镜（polarized light microscopy, POM）照片（使用PZO Mikroskopy生产的Studar® Lab Pol显微镜及佳能EOS 6D Mark II相机拍摄）。BDS和POM研究均在恒定温度T=353K、压力递增（从0.1 MPa至约500 MPa）条件下进行。各文件名称对应论文中的图编号：Łoś, J.等人，《压缩棒状液晶基纳米胶体中的近连续各向同性-向列相转变》，《分子液体杂志》382卷（2023）：121844。本集合包含的文件：FigA3.01——清亮点压力下压缩5CB的各向同性相和向列相的偏振光显微镜图像；FigA3.02——清亮点以上2 MPa压力下压缩5CB向列相的偏振光显微镜图像；FigA3.03——近向列相-固相转变压力下压缩5CB向列相的偏振光显微镜图像；FigA3.04——压缩过程中5CB的向列相-晶相转变偏振光显微镜图像；FigA3.05——5CB固相的偏振光显微镜图像；FigA3.06——清亮点压力下5CB+0.1wt% BaTiO3纳米胶体的各向同性相和向列相的偏振光显微镜图像；FigA3.07——清亮点以上1 MPa压力下5CB+0.1wt% BaTiO3纳米胶体向列相的偏振光显微镜图像；FigA3.08——清亮点以上100 MPa压力下5CB+0.1wt% BaTiO3纳米胶体向列相的偏振光显微镜图像；FigA3.09——结晶压力下5CB+0.1wt% BaTiO3纳米胶体的向列相和固相的偏振光显微镜图像；FigA3.10——5CB+0.1wt% BaTiO3纳米胶体固相的偏振光显微镜图像；Fig01——宽带介电谱（BDS）谱图示例：5CB及其纳米胶体在压力下介电常数实部（ε'）和虚部（ε''）随频率的变化关系，为等温（T=353K）压缩下各向同性液相、向列相和固相的测量结果；Fig02-04——压缩5CB及其掺杂BaTiO3纳米颗粒的纳米胶体中介电常数的等温压力演化规律，为等温（T=353K）压缩下各向同性液相、向列相和固相的测量结果；Fig05——5CB及其纳米胶体各向同性液相中介电常数的离子贡献随压力的演化规律，为等温（T=353K）压缩下各向同性液相、向列相和固相的测量结果；Fig06——T=353K压缩条件下5CB及其掺杂BaTiO3纳米颗粒的纳米胶体向列相中主弛豫时间的变化规律；Fig07——5CB及其掺杂BaTiO3纳米颗粒的纳米胶体在向列相中期（P=240 MPa，T=353K）介电损耗曲线的归一化叠加；Fig08——压缩5CB及其掺杂BaTiO3纳米颗粒的纳米胶体向列相中平移-取向解耦（translational-orientational decoupling）的测试（直流电导率与主弛豫时间的关系）；FigA1——清亮点温度（各向同性-向列相转变温度）及连续相转变（continuous phase transition）外推温度（T*）的压力依赖性。