Shape-induced chiral ordering in two-dimensional packing of snowmanlike dimeric particles

Han, Yugui; Lee, Juncheol; Choi, Siyoung Q.; Choi, Myung Chul; Kim, Mahn Won

doi:10.1103/physreve.88.042202

Cited by 7 publications

(7 citation statements)

References 33 publications

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“…1(A), the shape of dimers is changed by controlling the head-to-body size ratio γ. Random packing of these dimers results in amorphous structural behaviors without long-range order, similarly to binary disks [10,20]. It is also found that spatial and orientational correlations between dimers strongly depend on γ, while the maximally random jammed (MRJ) fraction is insensitive to γ [10].…”

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confidence: 89%

Shape-controlled percolation transition in 2D random packing of asymmetric dimers

Han

Lee

Choi

et al. 2015

EPL

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In this paper, we report on an experimental investigation of a shape-controlled percolation transition in two-dimensional (2D) amorphous packing of dimers without long-range order. In the maximally random jammed (MRJ) packing of asymmetric dimers consisting of head and body, a dramatic increase in the connectivity of heads upon increasing the head-to-body size ratio γ leads to a percolation transition of the heads at the well-defined percolation threshold. In comparison with binary disks, the existence of a bond in dimers causes the heads to be homogeneously distributed over a system by inhibiting the local segregation. Interestingly, we found, however, that the cluster structure at the percolation threshold is insensitive to the bond, even though the existence of the bonds affects the percolation threshold as well as the head distribution. The fractal dimensions at the percolation threshold obey the universal law of the 2D percolation theory independently of the existence of bonds. Our finding can provide us with a new perspective of interesting applications of randomly assembled binary composites by using the homogeneous particle distribution and the sensitively tunable connectivity under particle shape control.

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confidence: 89%

Shape-controlled percolation transition in 2D random packing of asymmetric dimers

Han

Lee

Choi

et al. 2015

EPL

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“…Namely, the dimer particles possess asphericity, but they are not hypostatic in the jammed phase. In recent experimental and numerical works [33][34][35], structures of two-dimensional asymmetric dimer packings were studied. For vibrational properties, it has been reported that the dimer particles exhibit rotational vibrations in the low-frequency region below the translational band [14].…”

Section: Introductionmentioning

confidence: 99%

Vibrational properties of two-dimensional dimer packings near the jamming transition

2019

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Jammed particulate systems composed of various shapes of particles undergo the jamming transition as they are compressed or decompressed. To date, sphere packings have been extensively studied in many previous works, where isostaticity at the transition and scaling laws with the pressure of various quantities, including the contact number and the vibrational density of states, have been established. Additionally, much attention has been paid to nonspherical packings, and particularly recent work has made progress in understanding ellipsoidal packings. In the present work, we study the dimer packings in two dimensions, which have been much less understood than systems of spheres and ellipsoids. We first study the contact number of dimers near the jamming transition. It turns out that packings of dimers have "rotational rattlers", each of which still has a free rotational motion. After correcting this effect, we show that dimers become isostatic at the jamming, and the excess contact number obeys the same critical law and finite size scaling law as those of spheres. We next study the vibrational properties of dimers near the transition. We find that the vibrational density of states of dimers exhibits two characteristic plateaus that are separated by a peak. The high-frequency plateau is dominated by the translational degree of freedom, while the low-frequency plateau is dominated by the rotational degree of freedom. We establish the critical scaling laws of the characteristic frequencies of the plateaus and the peak near the transition. In addition, we present detailed characterizations of the real space displacement fields of vibrational modes in the translational and rotational plateaus. arXiv:1905.02966v1 [cond-mat.soft]

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“…Interestingly, the role of structural fluctuations has been investigated also in a variety of different systems, like water [75], metallic melts [76,77], anisotropic particles [78][79][80], and polymers [81,82]. The idea of studying crystallization under external fields by studying the effects of the field on the bond orientational order is also a new direction for future research, whose power has been shown for example in Ref.…”

Section: Two-step Nucleation and Precursorsmentioning

confidence: 99%

Nonclassical pathways of crystallization in colloidal systems

Russo

Tanaka

2016

MRS Bull.

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Colloidal systems offer the ideal conditions to study the nucleation process, both from an experimental viewpoint, due to their relative large size and long time-scales, and from a modeling point of view, due to the tunability of their interactions. Here we review some recent works that study the process of colloidal crystallization from a microscopic perspective. We focus in particular on non-classical pathways to nucleation where the appearance of the solid crystals involves fluctuations of two (or more) order parameters. We interpret the non-classical behavior as a decoupling of positional and orientational symmetry breaking. We then consider how the nucleation pathway determines which polymorph is selected upon nucleation from the melt. Moreover we show how the study of nucleation pathways not only sheds new light on the microscopic mechanism of nucleation, but also provides important information regarding its avoidance, thus suggesting a deep link between crystallization and vitrification.

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Shape-induced chiral ordering in two-dimensional packing of snowmanlike dimeric particles

Cited by 7 publications

References 33 publications

Shape-controlled percolation transition in 2D random packing of asymmetric dimers

Shape-controlled percolation transition in 2D random packing of asymmetric dimers

Vibrational properties of two-dimensional dimer packings near the jamming transition

Nonclassical pathways of crystallization in colloidal systems

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