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• W2807904015 abstract "Recent studies unveiled the Fickian yet non-Gaussian (FNG) dynamics of many soft matter systems and suggested this phenomenon as a general characteristic of the diffusion in complex fluids. In particular, it was shown that the distribution of particle displacements in Fickian diffusion is not necessarily Gaussian, and thus the Einstein and Smoluchowski theory describing the Brownian motion of individual objects in a fluid would not be applicable. In the present work, we investigate whether the FNG dynamics so far reported in gels, granular materials, biological systems, and active matter systems is also a distinctive feature of colloidal liquid crystals. To this end, we perform Brownian dynamics simulations of oblate and prolate colloidal particles in the nematic phase. We detect a normal and Gaussian dynamics at short and long time scales, whereas, at intermediate time scales, a non-Fickian and non-Gaussian dynamics is found. Additionally, we revisit the nature of the decay of the self--van Hove correlation function, ${G}_{s}(r,t)$, which is approximated here with an ellipsoidal, rather than spherical, Gaussian distribution. The expression that we propose is able to correctly assess the Gaussian dynamics in inherently anisotropic systems, such as liquid crystals, where the standard Gaussian approximation of ${G}_{s}(r,t)$ would fail." @default.
• W2807904015 created "2018-06-21" @default.
• W2807904015 creator A5028229309 @default.
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• W2807904015 date "2018-10-17" @default.
• W2807904015 modified "2023-09-30" @default.
• W2807904015 title "Fickian yet non-Gaussian diffusion is not ubiquitous in soft matter" @default.
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• W2807904015 doi "https://doi.org/10.1103/physreve.98.042129" @default.
• W2807904015 hasPublicationYear "2018" @default.
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