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Molecular activation energies from ultrasonic dispersion

机译：超声分散产生的分子活化能

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摘要

Experimental values of ultrasonic dispersion are determined in eight unassociated organic liquids of low shear viscosity, using a kln mpt 10 echoskop, at 500 kHz and 24 MHz, at various temperatures. Both velocity (V) and it's dispersion (V_ω—V_0) are found to decrease with temperature. Expressions are worked out for the compressional relaxation time (τ), using the concepts of complex (*) and frequency (ω) dependent bulk viscosity coefficient and compressibility of the liquid, in terms of the dispersion (V_ω - V_0) and velocity (V_ω) of the wave in the medium. The value of r is found to vary with [(V_ω- V_0)/V_ω)]~(1/2). The velocity (V_ω) at the compressional relaxation frequency (i.e. ωτ = 1) is found to be twice the lowfrequency velocity (i.e. V_0). Temperature (T) variations of r in various liquids, are used to calculate their molecular activation energies (W) by plotting the linear variations between log_(10) τ and 1/TK. The ultrasonic (or compressional) relaxation times in these liquids are found to be between 10~(11) to 10~(10) s, comparing fairly well with available data. Values of W calculated from slopes of these linear plots, varies between 0.24 eV to 0.46 eV. They compare fairly well with available values.
机译：使用kln mpt 10 echoskop在500 kHz和24 MHz的各种温度下，在八种低剪切粘度的非缔合有机液体中测定超声分散的实验值。发现速度（V）及其色散（V_ω-V_0）都随温度降低。使用依赖于复数（*）和频率（ω）的体积粘度系数和液体的可压缩性的概念，根据分散度（V_ω-V_0）和速度（V_ω）来计算压缩松弛时间（τ）的表达式）中的波浪。发现r的值随[（V_ω-V_0）/V_ω）]〜（1/2）变化。发现在压缩松弛频率（即ωτ= 1）处的速度（V_ω）是低频速度（即V_0）的两倍。 r在各种液体中的温度（T）变化用于通过绘制log_（10）τ和1 / TK之间的线性变化来计算其分子活化能（W）。发现这些液体中的超声（或压缩）弛豫时间在10〜（11）到10〜（10）s之间，与现有数据相当好。根据这些线性图的斜率计算得出的W值在0.24 eV至0.46 eV之间变化。它们与可用值相当好。

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