Density, viscosity and ultrasonic velocity of binary mixture of carbamide with N, N-dimethylformamide have been measured at temperatures of 10 °C, 20 °C, 30 °C and 40 °C and at atmospheric pressure. From these experimental measurements the thermo-acoustical parameters such as acoustic impedance (Z), adiabatic compressibility (β), relaxation time (τ), intermolecular free length (L_f) and Gibb’s free energy of activation (DG) have been calculated. The variations in these parameters have been correlated to derive the intermolecular interactions taking place between the species of present binary mixture.


中文翻译：

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脲和N，N-二甲基甲酰胺二元混合物在不同温度下的热声特性

已在10°C，20°C，30°C和40°C的温度以及大气压下测量了尿素与N，N-二甲基甲酰胺的二元混合物的密度，粘度和超声速度。从这些实验测量中，已经计算出了热声参数，例如声阻抗（Z），绝热压缩率（β），弛豫时间（τ），分子间自由长度（L _f）和吉布的活化自由能（DG）。已经关联了这些参数的变化，以得出当前二元混合物的种类之间发生的分子间相互作用。