Concentration fluctuations in water–methanol mixtures as studied by ultrasonic absorption
Concentration fluctuations in water–methanol mixtures as studied by ultrasonic absorption
复制标题
通过超声波吸收研究水-甲醇混合物中的浓度波动
DOI：
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发表时间：
1976
期刊：
影响因子：
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通讯作者：
P. Kruus
中科院分区：
文献类型：
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作者：
William D. T. Dale;P. Flavelle;P. Kruus
在0、15和25 °C下，在10至50 MHz的频率下，在甲醇-水体系中进行了超声吸收和速度以及粘度的测量。 数据显示，存在两个最大的过量吸收作为组成的函数。这两个最大值的存在是由Romanov-Solovyev理论预测的，该理论将吸收与浓度波动联系起来。在25和0 °C下，根据密度、蒸汽压和扩散数据计算过量吸收的大小。给出了该体系在0 °C时密度和蒸汽压的新实验数据。计算的过量吸收与测量的相当一致。这表明，该系统中存在的任何特定的局部分子间相互作用最多只能导致较小部分的过量超声吸收，因为较长范围的浓度波动基本上是所有过量超声吸收的原因。甲醇-辛醇和正丙醇体系的超声数据。
Measurements of the ultrasonic absorption and velocity, and viscosity have been carried out in the system methanol–water at 0, 15, and 25 °C at frequencies from 10 to 50 MHz. The data show the existence of two maxima in the excess absorption as a function of composition. The existence of the two maxima are predicted by the Romanov–Solovyev theory relating the absorption to concentration fluctuations. The magnitude of the excess absorption is calculated at 25 and 0 °C from density, vapour pressure, and diffusion data. New experimental data on density and vapour pressure are presented for this system at 0 °C. The calculated excess absorption is in reasonable agreement with the measured. This indicates that any specific localized intermolecular interactions present in this system could be responsible for at best a smaller portion of the excess ultrasonic absorption, as longer range concentration fluctuations account for essentially all of the excess. Ultrasonic data on the systems methanol–octanol and n-prop...