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首页> 外文期刊>The Journal of Chemical Physics >Evolution of the isotropic to nematic phase transition in binary mixtures of octylcyanobiphenyl and n-hexane
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Evolution of the isotropic to nematic phase transition in binary mixtures of octylcyanobiphenyl and n-hexane

机译：辛基氰基联苯和正己烷的二元混合物中各向同性向列相转变的演变

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摘要

High-resolution calorimetry has been performed to study the effect of dilution by a nonmesogenic, low-molecular weight solvent (linear n-hexane) on the isotropic-nematic (I-N) phase transition in the liquid crystal (LC) octylcyanobiphenyl (8CB) as a function of n-hexane concentration. Numerous temperature scans were performed without continuous mixing for pure 8CB and all mixture samples of n-hexane mole fraction ranging from x_(hex) =0.02 to 0.12. The I-N specific heat peak remains first-order for all samples and shifts toward lower temperature nonlinearly while the two-phase I+N coexistence width broadens linearly with increasing x_(hex). Multiple heating and cooling scans are reproducible and indicate phase separation, if it occurs, must be on very short length scales and is reversible. These results may be a consequence of a competition between random dilution effects and the tendency to phase separate. It is shown that solvent dilution of a LC, if miscible and depending on solvent structure, can lead to a controlled altering of the intermolecular potentials and softening of the LC viscoelastic properties.
机译：进行了高分辨率量热法，研究了非介晶低分子量溶剂（线性正己烷）稀释对液晶（LC）辛基氰基联苯（8CB）中各向同性向列（IN）相变的影响。正己烷浓度的函数。在不连续混合的情况下，对纯8CB进行了许多温度扫描，正己烷摩尔分数的所有混合物样品的x_（hex）= 0.02至0.12。 I-N比热峰对所有样品均保持一阶，​​并且非线性地朝着较低温度移动，而两相I + N共存宽度则随着x_（hex）的增加而线性扩展。多次加热和冷却扫描是可重复的，并且表明相分离（如果发生）必须在非常短的长度范围内并且可逆。这些结果可能是随机稀释作用与相分离趋势之间竞争的结果。结果表明，如果溶剂混溶并且取决于溶剂结构，LC的溶剂稀释会导致分子间电位的受控变化和LC粘弹性的软化。

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