Speeding up Dynamics by Tuning the Noncommensurate Size of Rodlike Particles in a Smectic Phase
| Autor: | Marjolein Dijkstra, Eric Grelet, Massimiliano Chiappini |
|---|---|
| Přispěvatelé: | Soft Condensed Matter, Debye Institute for Nanomaterials Science, Centre de Recherche Paul Pascal (CRPP), Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2020 |
| Předmět: |
[PHYS]Physics [physics]
Imagination Materials science Chemical substance 010304 chemical physics media_common.quotation_subject FOS: Physical sciences General Physics and Astronomy macromolecular substances Condensed Matter - Soft Condensed Matter 01 natural sciences Rod Chemical physics Phase (matter) 0103 physical sciences Soft Condensed Matter (cond-mat.soft) Particle Lamellar structure sense organs Diffusion (business) 010306 general physics Science technology and society media_common |
| Zdroj: | Physical Review Letters Physical Review Letters, American Physical Society, 2020, 124 (8), ⟨10.1103/PhysRevLett.124.087801⟩ Physical Review Letters, 124(8), 1. American Physical Society |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.124.087801 |
| Popis: | Using simulations, we study the diffusion of rod-like guest particles in a smectic environment of rod-like host particles. We find that the dynamics of guest rods across smectic layers changes from a fast nematic-like diffusion to a slow hopping-type dynamics via an intermediate switching regime by varying the length of the guest rods with respect to the smectic layer spacing. We determine the optimal rod length that yields the fastest and the slowest diffusion in a lamellar environment. We show that this behavior can be rationalized by a complex 1D effective periodic potential exhibiting two energy barriers, resulting in a varying preferred mean position of the guest particle in the smectic layer. The interplay of these two barriers controls the dynamics of the guest particles yielding a slow, an intermediate and a fast diffusion regime depending on the particle length. To be published in Physical Review Letters |
| Databáze: | OpenAIRE |
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