Relaxation dynamics in the columnar liquid crystal phase of hard platelets

Patti, Alessandro; Belli, Simone; Roij, René van; Dijkstra, Marjolein

doi:10.1039/c0sm01265c

Cited by 30 publications

(34 citation statements)

References 97 publications

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“…Disc-like colloidal objects are experimentally observed to exhibit nematic, smectic and columnar type mesophases in consistent with theoretical predictions [90][91][92]. It should be noted that Langmuir had discovered in 1938 that bentonite clay particles exhibit a discotic nematic phase [22], much before the discovery of discotic LCs themselves.…”

Section: Liquid Crystalline Nanodiscssupporting

confidence: 70%

Liquid Crystalline Anisotropic Nanoparticles: From Metallic and Semiconducting Nanoparticles to Carbon Nanomaterials

Bisoyi

2015

Anisotropic Nanomaterials

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Anisotropic nanomaterials made of metals, semiconductors, or carbon are of special interest for their mechanical, electrical, magnetic, optical, chemical and other spectacular properties in the bottom-up fabrication of advanced functional materials and devices in the field of nanoscience and nanotechnology. To widen their applicability, it is necessary to process these anisotropic building blocks into different well-defined assembly structures with preferred orientations. This chapter deals with the liquid crystalline properties of one-and two-dimensional (1D and 2D) anisotropic nanoparticles such as nanorods, nanotubes, nanodiscs and graphene derivatives. The different strategies developed for the realization of liquid crystal phases from metallic, semiconducting and carbon based anisotropic nanoparticles have been discussed. High performance materials and devices fabricated by processing via liquid crystalline route of these materials have also been highlighted.

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Section: Liquid Crystalline Nanodiscssupporting

confidence: 70%

Liquid Crystalline Anisotropic Nanoparticles: From Metallic and Semiconducting Nanoparticles to Carbon Nanomaterials

Bisoyi

2015

Anisotropic Nanomaterials

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“…The opposite tendency is observed in nematic phases of oblate particles. Nevertheless, in positionally order smectic and columnar LCs, the layer-to-layer and column-to-column diffusion results to be significantly reduced and becomes slower than the in-layer or in-column diffusion [25][26][27][28][29][30] .…”

Section: Introductionmentioning

confidence: 99%

Brownian dynamics simulations of oblate and prolate colloidal particles in nematic liquid crystals

Morillo

Patti

Cuetos

2019

The Journal of Chemical Physics

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It is well known that understanding the transport properties of liquid crystals (LCs) is crucial to optimise their performance in a number of technological applications. In this work, we analyse the effect of shape anisotropy on the diffusion of rod-like and disk-like particles by Brownian dynamics simulations. To this end, we compare the dynamics of prolate and oblate nematic LCs incorporating particles with the same infinite-dilution translational or rotational diffusion coefficients. Under these conditions, which are benchmarked against the standard case of identical aspect ratios, we observe that prolate particles display faster dynamics than oblate particles at short and long timescales. Nevertheless, when compared at identical infinite-dilution translational diffusion coefficients, oblate particles are faster than their prolate counterparts at short-to-intermediate timescales, which extend over almost three time decades. Both oblate and prolate particles exhibit an anisotropic diffusion with respect to the orientation of the nematic director. More specifically, prolate particles show a fast diffusion in the direction parallel to the nematic director, while their diffusion in the direction perpendicular to it is slower. By contrast, the diffusion of oblate particles is faster in the plane perpendicular to the nematic director. Finally, in the light of our recent study on the longtime Gaussian and Fickian diffusion in nematic LCs, we map the decay of the autocorrelation functions and their fluctuations over the timescales of our simulations to ponder the existence of mobile clusters of particles and the occurrence of collective motion.

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“…The significance of establishing the matching of time-scales is justified by the recent increasing use of DMC for studying dynamics of various systems [14][15][16][17]. Recently, it has been proposed that equating the square of amplitude of MC displacement scaled with acceptance probability with infinite-dilution limit diffusion coefficient provides a good estimate of the physical time for spherical particles [6].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Monte Carlo simulations of anisotropic colloids

Jabbari-Farouji

Trizac

2012

The Journal of Chemical Physics

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We put forward a simple procedure for extracting dynamical information from Monte Carlo simulations, by appropriate matching of the short-time diffusion tensor with its infinite-dilution limit counterpart, which is supposed to be known. This approach -discarding hydrodynamics interactionsfirst allows us to improve the efficiency of previous Dynamic Monte Carlo algorithms for spherical Brownian particles. In a second step, we address the case of anisotropic colloids with orientational degrees of freedom. As an illustration, we present a detailed study of the dynamics of thin platelets, with emphasis on long-time diffusion and orientational correlations.

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Relaxation dynamics in the columnar liquid crystal phase of hard platelets

Cited by 30 publications

References 97 publications

Liquid Crystalline Anisotropic Nanoparticles: From Metallic and Semiconducting Nanoparticles to Carbon Nanomaterials

Liquid Crystalline Anisotropic Nanoparticles: From Metallic and Semiconducting Nanoparticles to Carbon Nanomaterials

Brownian dynamics simulations of oblate and prolate colloidal particles in nematic liquid crystals

Dynamic Monte Carlo simulations of anisotropic colloids

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