Dynamics of glass-forming liquids. VII. Dielectric relaxation of supercooled tris-naphthylbenzene, squalane, and decahydroisoquinoline
Dynamics of glass-forming liquids. VII. Dielectric relaxation of supercooled tris-naphthylbenzene, squalane, and decahydroisoquinoline
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DOI：
10.1063/1.1531587
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发表时间：
2003-01
影响因子：
4.4
通讯作者：
R. Richert;Kalyan Duvvuri;Lien Duong
中科院分区：
文献类型：
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作者：
R. Richert;Kalyan Duvvuri;Lien Duong
我们测量了几种分子有机过冷液体ααβ-三萘基苯（C36 H 24和C36 H 10 D 14）、角鲨烷和十氢异喹啉的介电弛豫。在10−2-107 Hz的频率范围内研究动态特性，相当于Tg和大约1.2×Tg之间的温度。对于介电损耗非常低的材料，需要tan δ = 3×10−5的分辨率才能观察到弛豫行为的细节。脆性、弛豫时间色散、时间-温度叠加和缓慢的Johari-Goldstein型β弛豫等特征量都是讨论的性质。
We have measured the dielectric relaxation of several molecular organic supercooled liquids, ααβ-tris-naphthylbenzene (C36H24 and C36H10D14), squalane, and decahydroisoquinoline. The dynamics is studied in the frequency range 10−2–107 Hz, equivalent to temperatures between Tg and approximately 1.2×Tg. For the very low dielectric loss materials, a resolution of tan δ≈3×10−5 is required in order to observe the details of the relaxation behavior. Characteristic quantities like fragility, relaxation time dispersion, time–temperature superposition, and the slow Johari–Goldstein type β relaxation are among the properties discussed.