用等温热重法和Knudsen渗出法测定多环芳烃的升华焓

IF 3.5 2区化学 Q2 CHEMISTRY, ANALYTICAL

Thermochimica Acta Pub Date : 2026-04-01 Epub Date: 2026-01-26 DOI:10.1016/j.tca.2026.180235

Marco Antonio Treviño-Kauffmann, Aarón Rojas-Aguilar

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引用次数: 0

摘要

本文采用等温热重法（TG）和Knudsen渗出法（KE）测定了10种多环芳烃（PAHs）的升华焓：5种C20H12异构体；四个C22H14异构体和一个C16H10异构体。这是通过测量质量损失率，并将TG的Pieterse-Focke方程与Clausius-Clapeyron方程结合，以及KE的Knudsen和Clausius-Clapeyron方程结合计算实验温度下的升华焓来实现的，然后将其修正为T=298.15 K。将得到的结果与先前报道的结果进行了比较，并对晶体结构进行了分析，以将升华焓结果与这些多环芳烃晶体排列中的许多几何形状引起的不同π堆叠相关联。

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Sublimation enthalpies of polycyclic aromatic hydrocarbons by isothermal thermogravimetry and Knudsen effusion method

In this work isothermal thermogravimetry (TG) and Knudsen effusion (KE) were applied to determine the enthalpies of sublimation of ten polycyclic aromatic hydrocarbons (PAHs): five C₂₀H₁₂ isomers; four C₂₂H₁₄ isomers and a C₁₆H₁₀ isomer. This was achieved by measuring the rate of mass loss and applying the combined Pieterse-Focke equation with the Clausius-Clapeyron equation for TG and the combined Knudsen and Clausius-Clapeyron equations for KE to calculate the sublimation enthalpies at the experimental temperature which were then corrected to T=298.15 K. The results obtained were compared with those previously reported and an analysis of the crystal structures was done to correlate the sublimation enthalpies results to the different π stackings caused by the many geometries in the crystal arrangements of each of these PAHs.

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来源期刊

Thermochimica Acta 化学-分析化学

CiteScore

6.50

自引率

8.60%

发文量

210

审稿时长

40 days

期刊介绍： Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application. The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta. The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas: - New and improved instrumentation and methods - Thermal properties and behavior of materials - Kinetics of thermally stimulated processes