Unusual Dielectric Strength of Debye Relaxation in Monohydroxy Alcohols upon Mixing

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• 作者：Hongxiang Gong ; Zeming Chen ; Dongyang Bi ; Mingdao Sun ; Yongjun Tian ; Li-Min Wang
• 刊名：The Journal of Physical Chemistry B
• 出版年：2012
• 出版时间：September 20, 2012
• 年：2012
• 卷：116
• 期：37
• 页码：11482-11487
• 全文大小：420K
• 年卷期：v.116,no.37(September 20, 2012)
• ISSN：1520-5207

文摘

The dielectric strength of the Debye relaxation in the binary mixtures of two isomeric monohydroxy alcohols, 2-ethyl-1-butanol (2E1B) and 4-methyl-2-pentanol (4M2P), is studied at low temperature near glass transition. Enhanced dielectric strength is exhibited in the mixtures, remarkably different from the mixing behaviors of the structural (伪-) relaxation of generic liquids. A similar result is observed when analyzing the dielectric data of the binary mixtures of 2-ethyl-1-hexanol and 2-methyl-1-butanol reported in an early study. The unusual behavior of the dielectric strength in the mixtures reveals a new feature of the Debye relaxation in monohydroxy alcohols. Yet, the calorimetric measurements of the glass transition temperature in 2E1B鈥?M2P mixtures show a distinct negative deviation from the ideal mixing law. The explanation of the Debye relaxation is discussed with the results.