Hydrogen Bonding and Chain Conformational Isomerization of Alcohols Probed by Ultrasonic Absorption and Shear Impedance Spectrometry
Hydrogen Bonding and Chain Conformational Isomerization of Alcohols Probed by Ultrasonic Absorption and Shear Impedance Spectrometry
复制标题
超声吸收和剪切阻抗光谱法探测醇的氢键和链构象异构化
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
U. Kaatze
中科院分区：
文献类型：
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作者：
R. Behrends;U. Kaatze
本文报道了几种一元醇在300 kHz ~ 3 GHz之间的声吸收谱和6 ~ 120 MHz之间的复剪切粘度谱。声谱表现出两个弛豫区，一个位于几百MHz附近的频率，另一个位于几GHz附近。剪切粘度谱揭示了符合低频声学弛豫的弛豫过程。这种松弛被分配到氢键醇簇的结构中的波动。本文用烷基链异构化的阻尼扭振子模型讨论了高频声弛豫，并与正构烷烃的旋转异构化相对应。估计了醇类的高频（>5 GHz）剪切粘度，发现其与正构烷烃的剪切粘度处于相同的量级（1 mPa s）。
The acoustical absorption spectra between 300 kHz and 3 GHz and the complex shear viscosity spectra between 6 and 120 MHz for some monohydric alcohols are reported. The acoustical spectra exhibit two relaxation regions, one located at frequencies around some hundred MHz and the other one around some GHz. The shear viscosity spectra reveal a relaxation process in conformity with the low-frequency acoustical relaxation. This relaxation is assigned to fluctuations in the structure of hydrogen bonded alcohol clusters. The highfrequency acoustical relaxation is discussed in terms of a damped torsional oscillator model of alkyl chain isomerization, corresponding with the rotational isomerization of n-alkanes. The high frequency (>5 GHz) shear viscosity of the alcohols is estimated and found in the same order (1 mPa s) as that for n-alkanes.