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Abstract: Using simulations we identify three dynamic regimes in supersaturatedisotropic fluid states of short hard rods: i for moderate supersaturations weobserve nucleation of multi-layered crystalline clusters; ii at highersupersaturation, we find nucleation of small crystallites which arrange intolong-lived locally favored structures that get kinetically arrested, whileiii at even higher supersaturation the dynamic arrest is due to theconventional cage-trapping glass transition. For longer rods we find that theformation of the stable smectic phase out of a supersaturated isotropic stateis strongly suppressed by an isotropic-nematic spinodal instability that causeshuge spinodal-like orientation fluctuations with nematic clusters diverging insize. Our results show that glassy dynamics and spinodal instabilities setkinetic limits to nucleation in a highly supersaturated hard-rod fluids.



Author: Ran Ni, Simone Belli, Rene van Roij, Marjolein Dijkstra

Source: https://arxiv.org/







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