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arXiv · 2201.12529

Piezo-Electric Shear Rheometry: Further developments in experimental implementation and data extraction

Mathias Mikkelsen·Kira L. Eliasen·Niclas Lindemann·Kevin Moch·Roland Böhmer·Hossein Ali Karimi-Varzaneh·Jorge Lacayo-Pineda·Bo Jakobsen·Kristine Niss·Tage Christensen·Tina Hecksher
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Abstract

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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Mathias Mikkelsen, Kira L. Eliasen, Niclas Lindemann, Kevin Moch, Roland Böhmer, Hossein Ali Karimi-Varzaneh, Jorge Lacayo-Pineda, Bo Jakobsen, Kristine Niss, Tage Christensen, Tina Hecksher. 2022-09-15. Piezo-Electric Shear Rheometry: Further developments in experimental implementation and data extraction. https://doi.org/10.1122/8.0000379

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