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Electron paramagnetic resonance study of alinement induced by magnetic fields in two smectic-A liquid crystals not exhibiting nematic phases

机译:电子顺磁共振研究磁场在两种不显示向列相的近晶A液晶中诱发的共振

摘要

Using vanadyl acetylacetonate (VAAC) as a paramagnetic probe, the molecular ordering in two smectic-A liquid crystals that do not display nematic phases were studied. Reproducible alinement was attained by slow cooling throughout the isotropic smectic-A transition in dc magnetic fields of 1.1 and 2.15 teslas. The degree of order attained is small for a smectic-A liquid crystal. Measurements were made of the variation of the average hyperfine splitting of the alined samples as a function of orientation relative to the dc magnetic field of the spectrometer. This functional dependence is in agreement with the theoretical prediction except where the viscosity of the liquid crystal becomes large enough to slow the tumbling of the VAAC, as indicated by asymmetry in the end lines of the spectrum.
机译:使用乙酰丙酮氧钒(VAAC)作为顺磁性探针,研究了两个不显示向列相的近晶A液晶的分子排列。在1.1和2.15特斯拉的直流磁场中,通过各向同性近晶A过渡的缓慢冷却,可以实现可重复的耐火性。对于近晶A液晶,获得的有序度较小。测量了倾斜样品的平均超细分裂的变化,该变化是相对于光谱仪的直流磁场的取向的函数。这种功能上的依赖性与理论预测相符,只是在液晶的粘度变得足够大以减慢VAAC的翻滚的情况下,如光谱的末端线中的不对称性所示。

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