Rivas-Barbosa, R., Escobedo-Sánchez, M. A., Tassieri, M. and Laurati, M. (2020) i-Rheo: determining the linear viscoelastic moduli of colloidal dispersions from step-stress measurements. Physical Chemistry Chemical Physics, 22, pp. 3839-3848. (doi: 10.1039/C9CP06191F)
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Abstract
We report on the application of a Fourier transform based method, `i-Rheo', to evaluate the linear viscoelastic moduli of hard-sphere colloidal dispersions, both in the fluid and glass states, from a direct analysis of raw step-stress (creep) experimental data. We corroborate the efficacy of i-Rheo by comparing the outputs of creep tests performed on homogenous complex fluids to conventional dynamic frequency sweeps. A similar approach is adopted for a number of colloidal suspensions over a broad range of volume fractions. For these systems, we test the limits of the method by varying the applied stress across the materials' linear and non-linear viscoelastic regimes, and we show that the best results are achieved for stress values close to the upper limit of the materials' linear viscoelastic regime; where the signal-to-noise ratio is at its highest and the non-linear phenomena have not appeared yet. We record that, the range of accessible frequencies is controlled at the higher end by the relative weight between the inertia of the instrument and the elasticity of the complex material under investigation; whereas, the lowest accessible frequency is dictated by the extent of the materials' linear viscoelastic regime. Nonetheless, despite these constrains, we confirm the effectiveness of i-Rheo for gaining valuable information on the materials' linear viscoelastic properties even from creep ringing data, confirming its potency and general validity as an accurate method for determining the material's rheological behaviour for a variety of complex systems.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Tassieri, Dr Manlio |
| Authors: | Rivas-Barbosa, R., Escobedo-Sánchez, M. A., Tassieri, M., and Laurati, M. |
| College/School: | College of Science and Engineering > School of Engineering > Biomedical Engineering |
| Journal Name: | Physical Chemistry Chemical Physics |
| Publisher: | Royal Society of Chemistry |
| ISSN: | 1463-9076 |
| ISSN (Online): | 1463-9084 |
| Published Online: | 24 January 2020 |
| Copyright Holders: | Copyright © 2020 Owner Societies |
| First Published: | First published in Physical Chemistry Chemical Physics 22:3839-3848 |
| Publisher Policy: | Reproduced in accordance with the publisher copyright policy |
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