Abstract
Strain-rate frequency superposition (SRFS) is often employed to probe the low-frequency behavior of soft solids under oscillatory shear in anticipated linear response. However, physical interpretation of an apparently well-overlapped master curve generated by SRFS has to combine with nonlinear analysis techniques such as Fourier transform rheology and stress decomposition method. The benefit of SRFS is discarded when some inconsistencies of the shifted master curves with the canonical linear response are observed. In this work, instead of evaluating the SRFS in full master curves, two criteria were proposed to decompose the original SRFS data and to delete the bad experimental data. Application to Carabopol suspensions indicates that good master curves could be constructed based upon the modified data and the high-frequency deviations often observed in original SRFS master curves are eliminated. The modified SRFS data also enable a better quantitative description and the evaluation of the apparent structural relaxation time by the two-mode fractional Maxwell model.
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Foundation item: Project(11372263) supported by the National Natural Science Foundation of China
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Li, Jj., Cheng, X., Zhang, Y. et al. A revisit of strain-rate frequency superposition of dense colloidal suspensions under oscillatory shears. J. Cent. South Univ. 23, 1873–1882 (2016). https://doi.org/10.1007/s11771-016-3242-6
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DOI: https://doi.org/10.1007/s11771-016-3242-6