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000893816 1001_ $$0P:(DE-Juel1)130797$$aLettinga, M. Paul$$b0$$eCorresponding author
000893816 245__ $$aWhen bigger is faster: A self-Van Hove analysis of the enhanced self-diffusion of non-commensurate guest particles in smectics
000893816 260__ $$aMelville, NY$$bAmerican Institute of Physics$$c2021
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000893816 520__ $$aWe investigate the anomalous dynamics in smectic phases of short host rods where, counter-intuitively, long guest rod-shaped particles diffuse faster than the short host ones due to their precise size mismatch. In addition to the previously reported mean-square displacement, we analyze the time evolution of the self-Van Hove functions G(r, t), as this probability density function uncovers intrinsic heterogeneous dynamics. Through this analysis, we show that the dynamics of the host particles parallel to the director becomes non-Gaussian and therefore heterogeneous after the nematic-to-smectic-A phase transition, even though it exhibits a nearly diffusive behavior according to its mean-squared displacement. In contrast, the non-commensurate guest particles display Gaussian dynamics of the parallel motion, up to the transition to the smectic-B phase. Thus, we show that the self-Van Hove function is a very sensitive probe to account for the instantaneous and heterogeneous dynamics of our system and should be more widely considered as a quantitative and complementary approach of the classical mean-squared displacement characterization in diffusion processes.I. INTRODUCTION
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000893816 7001_ $$00000-0001-7018-7817$$aAlvarez, Laura$$b1
000893816 7001_ $$0P:(DE-Juel1)188512$$aKorculanin, Olivera$$b2
000893816 7001_ $$00000-0002-9645-7077$$aGrelet, Eric$$b3
000893816 773__ $$0PERI:(DE-600)1473050-9$$a10.1063/5.0049093$$gVol. 154, no. 20, p. 204901 -$$n20$$p204901 -$$tThe journal of chemical physics$$v154$$x1089-7690$$y2021
000893816 8564_ $$uhttps://juser.fz-juelich.de/record/893816/files/5.0049093.pdf$$yPublished on 2021-05-24. Available in OpenAccess from 2022-05-24.
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