In this work, the conductance versus sweep frequency for AT-cut quartz crystal resonators was measured for methyl myristate, methyl oleate, and methyl linoleate under high pressure. The response of resonators immersed in methyl myristate at each temperature (313 K, 333 K, and 353 K) was obtained at pressures up to 140 MPa. The obtained values were nearly similar for both the fundamental mode and third overtone, and the obtained viscosities agreed with the literature data up to 100 MPa. For methyl oleate and methyl linoleate, the pressure dependence of the viscosity at various temperatures (293 K, 313 K, 333 K, and 353 K) was obtained up to 400 MPa. The viscosity increased exponentially in the low-pressure region with increasing pressure, but the rate of increase slowed above ~ 150 MPa and the viscosity deviated from an exponential increase. Fitting was performed using a Tait-type equation, and the deviation from the fitted value was calculated using this fitting equation. The pressure dependence of the viscosity could be obtained within 10 % of absolute average deviation (AAD) with a sample volume of ~ 2 mL using simple experimental equipment.

中文翻译：

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高达 400 MPa 的油酸甲酯和亚油酸甲酯粘度的压力依赖性

在这项工作中，在高压下测量了肉豆蔻酸甲酯、油酸甲酯和亚油酸甲酯的 AT 切割石英晶体谐振器的电导与扫描频率的关系。在高达 140 MPa 的压力下获得了在每个温度（313 K、333 K 和 353 K）下浸入肉豆蔻酸甲酯中的谐振器的响应。获得的基本模式和三次泛音的值几乎相似，并且获得的粘度与文献数据一致，最高可达 100 MPa。对于油酸甲酯和亚油酸甲酯，在各种温度（293 K、313 K、333 K 和 353 K）下获得了高达 400 MPa 的粘度的压力依赖性。在低压区，随着压力的增加，粘度呈指数增加，但在~150 MPa 以上增加速度减慢，并且粘度偏离了指数增加。使用 Tait 型方程进行拟合，并使用该拟合方程计算与拟合值的偏差。使用简单的实验设备，样品体积约为 2 mL，可以在绝对平均偏差 (AAD) 的 10% 内获得粘度的压力依赖性。