压电剪切流变测量：实验实施和数据提取的进一步发展
Piezo-Electric Shear Rheometry: Further developments in experimental implementation and data extraction
摘要：
压电剪切计（PSG）[Christensen & Olsen，Rev. Sci.仪器66，5019，1995]是一种流变技术，开发用于测量接近其玻璃化转变温度的粘性液体的复合剪切模量。我们报告了PSG技术的最新进展：1）优化了数据提取过程，将该方法的频率范围上限扩展到50和70 kHz之间。2)测量单元被简化为仅使用一个压电陶瓷盘而不是三个。我们提出了一种实现这种设计的液体样品。通过这种设计获得的数据表明，需要一个软的额外间隔物来允许样品在轴向方向上的热收缩。模型计算表明，当液体在冷却时变得粘稠时，径向方向上的流动受到单元的受限几何形状的阻碍。该方法特别适用于但不限于玻璃质材料。
英文摘要：
The Piezo-electric Shear Gauge (PSG) [Christensen & Olsen, Rev. Sci. Instrum. 66, 5019, 1995] is a rheometric technique developed to measure the complex shear modulus of viscous liquids near their glass transition temperature. We report recent advances to the PSG technique: 1) The data extraction procedure is optimized which extends the upper limit of the frequency range of the method to between 50 and 70 kHz. 2) The measuring cell is simplified to use only one piezo-electric ceramic disc instead of three. We present an implementation of this design intended for liquid samples. Data obtained with this design revealed that a soft extra spacer is necessary to allow for thermal contraction of the sample in the axial direction. Model calculations show that flow in the radial direction is hindered by the confined geometry of the cell when the liquid becomes viscous upon cooling. The method is especially well-suited for -- but not limited to -- glassy materials.
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