Grain boundary dynamics driven by magnetically induced circulation at the void interface of 2D colloidal crystals

Lobmeyer, Dana M; Biswal, Sibani Lisa

doi:10.1126/sciadv.abn5715

Cited by 9 publications

(7 citation statements)

References 55 publications

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“…1 (g)]. This agrees with experiments, where edge currents have also been observed at the surface of spinner clusters [44] and at grain boundaries [45] at the Re ≈ 0 limit. The measured radial particle velocity distribution shows a very good agreement with the hydrodynamic simulation [Fig.…”

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confidence: 90%

Collective Flows Drive Cavitation in Spinner Monolayers

Shen

Lintuvuori

2023

Phys. Rev. Lett.

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Hydrodynamic interactions can give rise to a collective motion of rotating particles. This, in turn, can lead to coherent fluid flows. Using large scale hydrodynamic simulations, we study the coupling between these two in spinner monolayers at weakly inertial regime. We observe an instability, where the initially uniform particle layer separates into particle void and particle rich areas. The particle void region corresponds to a fluid vortex, and it is driven by a surrounding spinner edge current. We show that the instability originates from a hydrodynamic lift force between the particle and fluid flows. The cavitation can be tuned by the strength of the collective flows. It is suppressed when the spinners are confined by a no-slip surface, and multiple cavity and oscillating cavity states are observed when the particle concentration is reduced.

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confidence: 90%

Collective Flows Drive Cavitation in Spinner Monolayers

Shen

Lintuvuori

2023

Phys. Rev. Lett.

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“…These are the so-called “disclination” defects [ 7 ], where the local number of neighbors is violated. In an analogy with dislocations, which are positional defects, a collection of 5/7 declination pairs are used to define “grain boundaries” between entropically ordered sections of 2D colloidal crystals [ 41 , 42 ]. The visible spacing or cracks between particles in certain regions for the films do not correspond well to the 5/7 declination pairs.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Spatial Order Characterization of Controlled Silica Particle Sizes Organized as Photonic Crystals Arrays

et al. 2022

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The natural occurrence of precious opals, consisting of highly organized silica particles, has prompted interest in the synthesis and formation of these structures. Previous research has shown that a highly organized photonic crystal (PhC) array is only possible when it is based on a low polydispersity index (PDI) sample of particles. In this study, a solvent-only variation method is used to synthesize different sizes of silica particles (SiPs) by following the traditional sol-gel Stöber approach. The controlled rate of the addition of the reagents promoted the homogeneity of the nucleation and growth of the spherical silica particles, which in turn yielded a low PDI. The opalescent PhC were obtained via self-assembly of these particles using a solvent evaporation method. Analysis of the spatial statistics, using Voronoi tessellations, pair correlation functions, and bond order analysis showed that the successfully formed arrays showed a high degree of quasi-hexagonal (hexatic) organization, with both global and local order. Highly organized PhC show potential for developing future materials with tunable structural reflective properties, such as solar cells, sensing materials, and coatings, among others.

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“…The equilibrium description of magnetic colloids in time-varying fields can break down as a result of coupling between the oscillating interactions and the particle dynamics at lower frequencies and/or the presence of magnetic torques at higher frequencies. The effects of such torques are evident in studies of solid-gas coexistence, which show that particle voids act as both source and sink for grain boundaries (104). Ordered crystal domains and grain boundaries can be identified by the local bond-orientational order parameter θ 6 (Figure 12c).…”

Section: Pushing the Limits Of Statistical Thermodynamicsmentioning

confidence: 99%

Active Colloids as Models, Materials, and Machines

Bishop

Biswal

Bharti

2023

Annu. Rev. Chem. Biomol. Eng.

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Active colloids use energy input at the particle level to propel persistent motion and direct dynamic assemblies. We consider three types of colloids animated by chemical reactions, time-varying magnetic fields, and electric currents. For each type, we review the basic propulsion mechanisms at the particle level and discuss their consequences for collective behaviors in particle ensembles. These microscopic systems provide useful experimental models of nonequilibrium many-body physics in which dissipative currents break time-reversal symmetry. Freed from the constraints of thermodynamic equilibrium, active colloids assemble to form materials that move, reconfigure, heal, and adapt. Colloidal machines based on engineered particles and their assemblies provide a basis for mobile robots with increasing levels of autonomy. This review provides a conceptual framework for understanding and applying active colloids to create material systems that mimic the functions of living matter. We highlight opportunities for chemical engineers to contribute to this growing field. Expected final online publication date for the Annual Review of Chemical and Biomolecular Engineering, Volume 14 is June 2023. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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Grain boundary dynamics driven by magnetically induced circulation at the void interface of 2D colloidal crystals

Cited by 9 publications

References 55 publications

Collective Flows Drive Cavitation in Spinner Monolayers

Collective Flows Drive Cavitation in Spinner Monolayers

Synthesis and Spatial Order Characterization of Controlled Silica Particle Sizes Organized as Photonic Crystals Arrays

Active Colloids as Models, Materials, and Machines

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