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Orientational fluctuations and phase transitions in 8CB confined by cylindrical pores of the PET film

机译：PET薄膜的圆柱孔限制了8CB的取向波动和相变

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摘要

Results of optical investigations of the isotropic-nematic and nematic-smectic A phase transitions in porous polyethyleneterephthalate (PET) films filled with octyl-cyanobihenyl (8CB) liquid crystal (LC) are reported. Samples of porous films of thickness 23 mu m with normally oriented cylindrical pores of a radius R ranging from 10nm to 1000nm were prepared using the track-etched membrane technology. The dynamic light scattering method was used to probe the nematic orientational fluctuations of confined LC samples. The corresponding relaxation time was measured as a function of R and temperature T at slow enough cooling rates (0.3-0.6 K/h) to locate the phase transition temperatures. Changes in (T) dependencies relatively sensitivity fingerprint the LC phase transformations. Experimental results are analysed using the Landau-de Gennes-Ginzburg phenomenological approach.
机译：光学研究的结果表明，在填充有辛基-氰基联苯基（8CB）液晶（LC）的聚对苯二甲酸乙二酯（PET）多孔膜中，各向同性向列相和向列向列相A相转变。使用轨迹蚀刻膜技术制备厚度为23μm的多孔膜样品，该膜的法向取向半径为10nm至1000nm的圆柱孔。动态光散射方法用于探测受限LC样品的向列取向波动。在足够慢的冷却速率（0.3-0.6 K / h）下，将相应的弛豫时间测量为R和温度T的函数，以定位相变温度。 （T）相依性的变化相对敏感地指纹识别LC相变。实验结果使用Landau-de Gennes-Ginzburg现象学方法进行分析。

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