An Experimental and Theoretical Determination of Oscillatory Shear-Induced Crystallization Processes in Viscoelastic Photonic Crystal Media.
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Publication Date
2021-09-14Journal Title
Materials (Basel)
ISSN
1996-1944
Publisher
MDPI AG
Volume
14
Issue
18
Language
eng
Type
Article
This Version
VoR
Physical Medium
Electronic
Metadata
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Finlayson, C. E., Rosetta, G., & Baumberg, J. (2021). An Experimental and Theoretical Determination of Oscillatory Shear-Induced Crystallization Processes in Viscoelastic Photonic Crystal Media.. Materials (Basel), 14 (18) https://doi.org/10.3390/ma14185298
Abstract
A study is presented of the oscillatory shear-ordering dynamics of viscoelastic photonic crystal media, using an optical shear cell. The hard-sphere/"sticky"-shell design of these polymeric composite particles produces athermal, quasi-solid rubbery media, with a characteristic viscoelastic ensemble response to applied shear. Monotonic crystallization processes, as directly measured by the photonic stopband transmission, are tracked as a function of strain amplitude, oscillation frequency, and temperature. A complementary generic spatio-temporal model is developed of crystallization due to shear-dependent interlayer viscosity, giving propagating crystalline fronts with increasing applied strain, and a gradual transition from interparticle disorder to order. The introduction of a competing shear-induced flow degradation process, dependent on the global shear rate, gives solutions with both amplitude and frequency dependence. The extracted crystallization timescales show parametric trends which are in good qualitative agreement with experimental observations.
Identifiers
External DOI: https://doi.org/10.3390/ma14185298
This record's URL: https://www.repository.cam.ac.uk/handle/1810/331175
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