Abstract

The phase transitions in the homologous series of normal alkanes: hexadecane (C₁₆H₃₄), heptadekane (C₁₇H₃₆), octadekane (C₁₈H₃₈), nonadekane (C₁₉H₄₀), and eicosane (C₂₀H₄₂) have been studied by differential scanning calorimetry. The elimination of methodic errors enables the obtainment of true values of the thermodynamic parameters of these transitions. The quantitative analysis of the profiles of the heat capacity jumps performed for the solid-phase first-order transitions on the base of the blurred phase transition theory allowed the calculation of a new-phase nucleus sizes in the volume of the old phase during the structural phase transition and the consideration of the kinetics of their development. The method of separating asymmetric peaks of the heat capacity into components has been improved, which enables the separation of various stages of developing the solid-phase transitions.

中文翻译：

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正构烷烃分子晶体结构相变过程中纳米核的形成

摘要

正构烷烃的同源系列的相变：十六烷（C ₁₆ H ₃₄），庚烷（C ₁₇ H ₃₆），十八烷（C ₁₈ H ₃₈），壬二烷（C ₁₉ H ₄₀）和二十烷（C ₂₀ H ₄₂）已通过差示扫描量热法进行了研究。方法误差的消除使得能够获得这些转变的热力学参数的真实值。在模糊相变理论的基础上对固相一阶跃迁进行的热容跃迁的定量分析，可以计算出结构期间旧相体积中的新相核尺寸相变及其发展动力学的考虑。将热容量的不对称峰分离成组分的方法已得到改进，这使得能够分离出形成固相转变的各个阶段。