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Updated: Feb 3, 2026

Calibration Procedures for Orthogonal Superposition Rheology
Published on: November 18, 2020
Orthogonal superposition rheometry of colloidal gels: time-shear rate superposition
Sang Hoon Sung1, Sunhyung Kim, Jan Hendricks
1School of Chemical and Biological Engineering, Seoul National University, 08826 Seoul, Korea. ahnnet@snu.ac.kr.
Abstract:
We explore the relaxation behavior of model colloidal gels under steady shear flow by means of orthogonal superposition rheometry. Fumed silica and carbon black dispersions in Newtonian matrices are used as a model system. As shear rate increases, the frequency dependent orthogonal moduli of the gels shift along the frequency axis without changing their shape, which finally can be superimposed to yield a single master curve. This indicates that the shear rate tunes a master clock for overall relaxation modes in the sheared colloidal gels to produce a "time-shear rate superposition (TSS)", as temperature does in polymeric liquids to produce a time-temperature superposition (TTS). The horizontal shift factor required at each shear rate to obtain the master curve is found to be directly proportional to the suspension viscosity for all the cases. From this result, we suggest that the suspension viscosity determines the overall relaxation time of the particles in the flowing colloidal gel.
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