Stringlike Clusters and Cooperative Interlayer Permeation in Smectic Liquid Crystals Formed by Colloidal Rods

Patti, Alessandro; Masri, Djamel El; Roij, René van; Dijkstra, Marjolein

doi:10.1103/physrevlett.103.248304

Cited by 54 publications

(89 citation statements)

References 28 publications

(36 reference statements)

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“…4(c), decreases in the case of the stiff fd-Y21M, while it increases in the case of fd-wt [16]. Although the ratio of parallel over perpendicular diffusion is still higher than 1, contrary to what is observed for the thermotropic liquid crystal [20,21] and simulations [9,18,19], this behavior corresponds to what is expected for a smectic A phase formed of two-dimensional liquid layers.…”

Section: Resultsmentioning

confidence: 65%

Dynamics in the smectic phase of stiff viral rods

2011

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We report on the dynamics in colloidal suspensions of stiff viral rods, called fd-Y21M. This mutant filamentous virus exhibits a persistence length 3.5 times larger than the wild-type fd-wt. Such a virus system can be used as a model system of rodlike particles for studying their self-diffusion. In this paper, the physical features, such as rod contour length and polydispersity have been determined for both viruses. The effect of viral rod flexibility on the location of the nematic-smectic phase transition has been investigated, with a focus on the underlying dynamics studied more specifically in the smectic phase. Direct visualization of the stiff fd-Y21M at the scale of a single particle has shown the mass transport between adjacent smectic layers, as found earlier for the more flexible rods. We could relate this hindered diffusion with the smectic ordering potentials for varying rod concentrations. The self-diffusion within the layers is far more pronounced for the stiff rods as compared to the more flexible fd-wt viral rod.

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Section: Resultsmentioning

confidence: 65%

Dynamics in the smectic phase of stiff viral rods

2011

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“…Preliminary observation of the dynamics of colloidal silica rods [17] in the smectic phase suggests larger values of D xy than D z . Interlayer diffusion is also studied by MD simulations in a model of rod-sphere mixture [18], hard-core spherocylinders [19], and in atomic detailed sexithiophene [20]. The ratio is much smaller for these simulated shorter particles (molecules), but still D z /D xy > 1 [18,20] or D z /D xy ≃ 1 [19] in the SmA phase.…”

Section: One-dimensional Hopping In Liquid Crystal Phasementioning

confidence: 99%

One-, Two-, and Three-Dimensional Hopping Dynamics

et al. 2013

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Hopping dynamics in glass has been known for quite a long time. In contrast, hopping dynamics in smectic-A (SmA) and hexatic smectic-B (HexB) liquid crystals (LC) has been observed only recently. The hopping in SmA phase occurs among the smectic layers (one-dimensionally), while hopping in HexB phase occurs inside the layers (two-dimensionally). The hopping dynamics in SmA and HexB liquid crystal phases is investigated by parallel soft-core spherocylinders, while three-dimensional hopping dynamics in inherent glassy states is investigated by systems of Weeks-Chandler-Andersen (WCA) spheres. The temperature dependence of diffusion coefficients of hopping in SmA phase can be described by the Arrhenius equation characteristic of activation process. In HexB LC phase, the diffusion coefficients saturate at higher temperatures. In a system of WCA spheres, the values and temperature dependence of diffusion coefficients depend on the observed states.

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“…Smectic phases of monodisperse silica rods also showed a hopping-type interlayer diffusive motion, albeit that in this case the layer-to-layer diffusion is slower than the in-layer diffusion [7,37]. This unusual type of diffusion of particles in the smectic phase has been observed in computer simulations as well, highlighting the highly correlated nature of particle motion in congested phases [38][39][40].…”

Section: Introductionmentioning

confidence: 53%

Collective stringlike motion of semiflexible filamentous particles in columnar liquid crystalline phases

Naderi

Schoot

2013

Phys. Rev. E

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We study, by means of Brownian dynamics simulations, heterogeneous dynamics in a dense columnar phase of monodisperse hard filamentous particles, and find that in a background of barely moving particles, some particles occasionally engage in a fast coherent string-type motion similar to what is observed in glassy states of isometric particles. This fast motion is triggered by the exchange of particles between two or more columns at different positions in the columns, which leads to sudden displacement of particles between these positions. The distribution of particle displacements shows a pronounced peak at one particle length. We perform our simulations with particles of different persistence lengths and find that for more flexible particles, the number of jump events increases. As the number of particles in the columns increases with system size for a given linear fraction of particles in the columns, the peak in the distribution becomes wider and, for sufficiently large systems, the peak disappears completely. This is associated with the increase in the magnitude of fluctuations in the motion of particles as the system size increases. Our simulation results explain recent experimental observations on single-particle motion in dense columnar phases in aqueous dispersions of filamentous virus particles.

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Stringlike Clusters and Cooperative Interlayer Permeation in Smectic Liquid Crystals Formed by Colloidal Rods

Cited by 54 publications

References 28 publications

Dynamics in the smectic phase of stiff viral rods

Dynamics in the smectic phase of stiff viral rods

One-, Two-, and Three-Dimensional Hopping Dynamics

Collective stringlike motion of semiflexible filamentous particles in columnar liquid crystalline phases

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