The European Physical Journal E ( IF 1.8 ) Pub Date : 2022-09-08 , DOI: 10.1140/epje/s10189-022-00224-z Jakub Kalabiński 1 , Aleksandra Drozd-Rzoska 1 , Sylwester J Rzoska 1
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Coexistence curves in mixtures of limited miscibility with the lower critical consolute temperature (LCT), of 3-picoline with deuterium oxide (D2O), and D2O/H2O have been determined. They were tested with respect to the order parameter, the diameter of the binodal, and coordinates of the critical consolute point (critical temperature \({T}_{\mathrm{C}}\) and critical concentration \({\phi }_{\mathrm{C}}\)). Studies were carried out using the innovative method based on the analysis of relative volumes occupied by coexisting phases, yielding high-resolution data. The clear violation of the Cailletet-Mathew law of rectilinear diameter for the LCT mixtures of limited miscibility is evidenced. For the order parameter, the new distortion-sensitive analysis method yielded the evidence for the model-value of the order parameter critical exponent \(\beta =0.326\pm 0.003\), up to ca. 1 K from \({T}_{\mathrm{C}}\). Finally, the simple & easy method for determining the critical concentration by testing relative volumes of coexisting phases (or alternatively fractional meniscus heights, h) is presented. The significance of the invariant value \({h}_{\mathrm{C}}=h\left({T}_{\mathrm{C}},{\phi }_{\mathrm{C}}\right)=1/2\) is highlighted. The appearance of the milky & bluish critical opalescence is also shown.
Graphical abstract
中文翻译：
对 3-甲基吡啶-氧化氘 (D2O) 混合物的新见解
3-甲基吡啶与氧化氘 (D 2 O) 和 D 2 O/H 2 O 在具有较低临界溶解温度 (LCT) 的有限混溶性混合物中的共存曲线已经确定。对它们的阶参数、双节线直径和临界共和点坐标（临界温度\({T}_{\mathrm{C}}\)和临界浓度\({\phi } _{\mathrm{C}}\)）。使用基于共存相所占相对体积分析的创新方法进行研究，产生高分辨率数据。对于有限混溶性的 LCT 混合物，明显违反了 Cailletet-Mathew 直线直径定律。对于阶参数，新的失真敏感分析方法为阶参数临界指数\(\beta =0.326\pm 0.003\)的模型值提供了证据，最高可达 ca。1 K 来自\({T}_{\mathrm{C}}\)。最后，介绍了一种通过测试共存相的相对体积（或分数弯月面高度h）来确定临界浓度的简单方法。不变值的意义\({h}_{\mathrm{C}}=h\left({T}_{\mathrm{C}},{\phi }_{\mathrm{C}}\right)=1/2\ )突出显示。还显示了乳白色和蓝色临界乳光的外观。
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