Dielectric relaxation of long-chain glass-forming monohydroxy alcohols.
Dielectric relaxation of long-chain glass-forming monohydroxy alcohols.
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DOI：
10.1063/1.4825398
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发表时间：
2013-10
期刊：
影响因子：
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通讯作者：
Yanqin Gao;Wenkang Tu;Zeming Chen;Yongjun Tian;Riping Liu;Li-Min Wang
中科院分区：
文献类型：
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作者：
Yanqin Gao;Wenkang Tu;Zeming Chen;Yongjun Tian;Riping Liu;Li-Min Wang
研究了2-丁基-1-辛醇和2-己基-1-癸醇两种长链玻璃形成的一元醇的低温介电弛豫。与短链醇介电谱不同的是，最慢的动力学过程从纯德拜弛豫中得到显著的展宽。随着温度的升高，两种液体中类德拜弛豫的宽度逐渐变宽，类德拜弛豫宽度和结构弛豫宽度逐渐接近。2-乙基-1-己醇在2-己基-1-癸醇或角鲨烷中的介电谱也观察到类似的结果。液体和混合物的结果表明，展宽与类德拜弛豫强度之间存在关联。用德拜弛豫修正方法讨论了单羟基醇中的分子缔合。
The dielectric relaxation of two long-chain glass forming monohydroxy alcohols, 2-butyl-1-octanol and 2-hexyl-1-decanol, is studied at low temperature. Remarkable broadening from the pure Debye relaxation is identified for the slowest dynamics, differing from the dielectric spectra of short-chain alcohols. The broadening of the Debye-like relaxation in the two liquids develops as temperature increases, and the approaching of the Debye-like and structural relaxation widths is shown. Similar results are observed in the dielectric spectra of dilute 2-ethyl-1-hexanol in either 2-hexyl-1-decanol or squalane. The results of the liquids and mixtures reveal a correlation between the broadening and the Debye-like relaxation strength. Molecular associations in monohydroxy alcohols are discussed with the modification of the Debye relaxation.