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A revisit of strain-rate frequency superposition of dense colloidal suspensions under oscillatory shears

Journal of Central South University 2016年第8期23卷 1873-1882页

作者：李俊杰程璇张颖孙尉翔 Department of Mathematics and Applied Mathematic Xiamen University Fujian Key Laboratory of Advanced Materials Xiamen University Department of Materials Science and Engineering College of Materials Xiamen University Research Institute of Materials Science and State Key Laboratory of Luminescent Materials and Devices South China University of Technology

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.

关键词： strain-rate frequency superposition medium amplitude oscillatory shear linear viscoelasticity fractional Maxwell model

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