Grain splitting is a mechanism for grain coarsening in colloidal polycrystals

Barth, Anna R.; Martinez, Maya H.; Payne, Cora E.; Couto, Chris G.; Quintas, Izabela J.; Soncharoen, Inq; Brown, Nina M.; Weissler, Eli J.; Gerbode, Sharon J.

doi:10.1103/physreve.104.l052601

Cited by 3 publications

(5 citation statements)

References 39 publications

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“…[54] Noteworthily, the complete particle trajectories during the annealing reveal larger-scale patterns with hexagonal symmetry (Figure 7, left), which evidence an underlying collective reorganization. These patterns coincide with motion patterns in rotating granules, an annealing mechanism only recently reported by Barth et al [59] In this mechanism, a grain splits up into smaller cells, termed granules, that each rotate around a center particle to locally reorient the particles within the individual granule. The center particles do not need to move during annealing, as they are in phase with the lattices of both neighboring grains.…”

Section: The Model Assumes a Polycrystalline 2d Crystal With Repulsivesupporting

confidence: 78%

Section: Resultsmentioning

confidence: 99%

“…These patterns coincide with the increase in granule dimension with decreasing orientation angle mismatch predicted for granule rotation. [59] Finally, it is noteworthy that a scaling analysis by Barth et al shows that the energy barrier associated with granule rotation becomes rapidly prohibitive at larger grain sizes and orientation angles. [59] In contrast, our results indicate that successive granule realignment can occur at larger system sizes and for large orientation angle mismatches (i.e., forming small granules), likely because of the increase in available area during annealing.…”

Section: The Model Assumes a Polycrystalline 2d Crystal With Repulsivementioning

confidence: 99%

“…[59] Finally, it is noteworthy that a scaling analysis by Barth et al shows that the energy barrier associated with granule rotation becomes rapidly prohibitive at larger grain sizes and orientation angles. [59] In contrast, our results indicate that successive granule realignment can occur at larger system sizes and for large orientation angle mismatches (i.e., forming small granules), likely because of the increase in available area during annealing.…”

Section: The Model Assumes a Polycrystalline 2d Crystal With Repulsivementioning

confidence: 99%

“…[58] The means by which the individual particles rearrange to anneal the crystal is a fundamental question in the annealing process. Both the movement of individual particles from one grain to another, [54] as well as collective rotations around center particles [59] have been proposed as annealing mechanisms, but the relation between these mechanisms remains poorly understood.…”

Section: Introductionmentioning

confidence: 99%

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Acoustic Crystallization of 2D Colloidal Crystals

et al. 2022

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2D colloidal crystallization provides a simple strategy to produce defined nanostructure arrays over macroscopic areas. Regularity and long‐range order of such crystals is essential to ensure functionality, but difficult to achieve in self‐assembling systems. Here, a simple loudspeaker setup for the acoustic crystallization of 2D colloidal crystals (ACDC) of polystyrene, microgels, and core–shell particles at liquid interfaces is introduced. This setup anneals an interfacial colloidal monolayer and affords an increase in average grain size by almost two orders of magnitude. The order is characterized via the structural color of the colloidal crystal, the acoustic annealing process is optimized via the frequency and the amplitude of the applied sound wave, and its efficiency is rationalized via the surface coverage‐dependent interactions within the interfacial colloidal monolayer. Computer simulations show that multiple rearrangement mechanisms at different length scales, from the local motion around voids to grain boundary movements via consecutive particle rotations around common centers, collude to remove defects. The experimentally simple ACDC process, paired with the demonstrated applicability toward complex particle systems, provides access to highly defined nanostructure arrays for a wide range of research communities.

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Section: The Model Assumes a Polycrystalline 2d Crystal With Repulsivesupporting

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Section: The Model Assumes a Polycrystalline 2d Crystal With Repulsivementioning

confidence: 99%

Section: The Model Assumes a Polycrystalline 2d Crystal With Repulsivementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Acoustic Crystallization of 2D Colloidal Crystals

et al. 2022

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Hexagonal vortices enable faster colloidal crystal grain coarsening

Chaffee,

Corona-Oceguera,

Couto

et al. 2024

Phys. Rev. E

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Grain rotation in impurity-doped two-dimensional colloidal polycrystals

Hutchinson,

Dullens

2024

Phys. Rev. Materials

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Grain texture evolution and coarsening after quenching can be achieved by curvature-driven growth and grain rotation. Here we examine grain rotation in coarsening, impurity-doped, two-dimensional colloidal polycrystals. We find the rate of rotation to be independent of the impurity concentration and proportional to the inverse of the grain size. The latter is rationalized by considering grain rotation driven by grain-boundary sliding and particle diffusion in the lattice. We also show that rotation driven grain growth and curvature driven growth are independent, with the latter being the dominant mechanism in our system. Next, we examine the dislocation reactions underlying grain rotation and observing its facilitation via the effective “sinking” of grain-boundary dislocations into triple junctions, as has been predicted by simulations. Published by the American Physical Society 2024

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Grain splitting is a mechanism for grain coarsening in colloidal polycrystals

Cited by 3 publications

References 39 publications

Acoustic Crystallization of 2D Colloidal Crystals

Acoustic Crystallization of 2D Colloidal Crystals

Hexagonal vortices enable faster colloidal crystal grain coarsening

Grain rotation in impurity-doped two-dimensional colloidal polycrystals

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