Slanted stacking faults and persistent face centered cubic crystal growth in sedimentary colloidal hard sphere crystals

Hilhorst, Jan; Wolters, Joost R.; Petukhov, Andrei V.

doi:10.1039/c0ce00022a

Cited by 14 publications

(32 citation statements)

References 38 publications

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“…In our simulation, the domains with the local fcc structure and the local hcp structure are mixed, which is probably because the external force and the density of particles are larger than the value used in previous studies [35][36][37]. In our simulation, the dependence of N fcc and N hcp on the tilting angle changes with change in the force strength, but now we cannot simply explain why the changes in N fcc and N hcp is caused by the difference in force direction, which is one of our future problems.…”

Section: Discussionmentioning

confidence: 76%

Ordering of Brownian particles from walls due to an external force

Sato

Katsuno

Suzuki

2014

Journal of Crystal Growth

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Keeping the formation of colloidal crystal under a centrifugal force in mind, we study the ordering of Brownian particles under a uniform external force.Owing to the external force, the particles move in the direction of the external force. Near walls, the density of particles increases and the ordering of particles occurs on the walls at first. Then, the ordering in bulk proceeds gradually. Domains with the face-centered cubic and hexagonal close-packed structures are created in bulk. By controlling the direction and strength of external force, the ratio of the two types of structures changes.

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Section: Discussionmentioning

confidence: 76%

Ordering of Brownian particles from walls due to an external force

Sato

Katsuno

Suzuki

2014

Journal of Crystal Growth

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“…During sedimentation by centrifugal force, the hydrodynamic effects [17][18][19][20] may not be neglected. However, since the centrifugal force in the experiment 13) is much weaker than that in other experiments, [21][22][23][24][25] the hydrodynamic effects may be smaller than those in other experiments. Thus, in order to simplify the model, we neglect the hydrodynamic effects and carry out simulation.…”

Section: Modelmentioning

confidence: 70%

Crystallization of Brownian Particles from Walls Induced by a Uniform External Force

2013

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Keeping the formation of colloidal crystal under a centrifugal force in mind, we study ordering of Brownian particles induced by a uniform external force. When the uniform external force is added, the particles move in the direction of the external force and the density of particles near walls becomes high. Ordering of particles starts on the walls, and successively ordering in bulk occurs near the walls. In bulk, both domains of the face-centered cubic structure and the hexagonal close-packed structure appear. By controlling the direction and the strength of the external force, the number of ordered particles and the distribution of cluster size are changed.

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“…Even at equilibrium, colloidal crystals can have a finite density of defects, which can be anomalously large for certain colloidal lattices [18]. The opposite can also happen as defects can play a decisive role in the choice of the crystal structure [19,20]. For applications such as photonic crystals most of growth-induced defects can deteriorate their optical properties.…”

mentioning

confidence: 99%

Revealing Three-Dimensional Structure of an Individual Colloidal Crystal Grain by Coherent X-Ray Diffractive Imaging

et al. 2016

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We present results of a coherent x-ray diffractive imaging experiment performed on a single colloidal crystal grain. The full three-dimensional (3D) reciprocal space map measured by an azimuthal rotational scan contained several orders of Bragg reflections together with the coherent interference signal between them. Applying the iterative phase retrieval approach, the 3D structure of the crystal grain was reconstructed and positions of individual colloidal particles were resolved. As a result, an exact stacking sequence of hexagonal close-packed layers including planar and linear defects were identified. DOI: 10.1103/PhysRevLett.117.138002 Colloidal crystals nowadays are actively exploited as an important model system to study nucleation phenomena in freezing, melting, and solid-solid phase transitions [1][2][3][4][5], jamming and glass formation [6,7]. In addition, colloidal crystals are attractive for multiple applications since they can be used as large-scale templates to fabricate novel materials with unique optical properties such as the full photonic band gap, "slow" photons and negative refraction, as well as materials for application in catalysis, biomaterials, and sensorics [8][9][10][11]. Colloidal crystals grown by self-organization provide a low cost large-scale alternative to lithographic techniques, which are very effective for producing high-quality materials with a desired structure, but are limited in building up a truly three-dimensional (3D) structure and bring high production costs [12]. Recently, significant progress has been achieved in engineering materials with tunable periodic structure on the mesoscale by functionalizing colloids with DNA [13], applying external fields [14,15] or varying the particle shape [16,17].Understanding the real structure of colloidal crystals and its disorder is an important aspect from both fundamental and practical points of view. Even at equilibrium, colloidal crystals can have a finite density of defects, which can be anomalously large for certain colloidal lattices [18]. The opposite can also happen as defects can play a decisive role in the choice of the crystal structure [19,20]. For applications such as photonic crystals most of growth-induced defects can deteriorate their optical properties. On the other hand, controlled incorporation of certain defects can be desirable to enhance the functionality such as creating wave guides [21,22], trapping photons [12,23], and developing optical chips [24]. In these studies, monitoring an internal 3D structure of colloidal crystals including defects in real time remains a challenge [25].Among widely used techniques of the colloidal crystal structure investigation are optical microscopy [26,27] and confocal laser scanning microscopy [28]. However, the range of applications of these methods is strongly reduced by the limited resolution (at best about 250 nm) and the need of a careful refractive index matching, which is not always possible. Furthermore, some of the materials are opaque for visible light which comp...

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Slanted stacking faults and persistent face centered cubic crystal growth in sedimentary colloidal hard sphere crystals

Cited by 14 publications

References 38 publications

Ordering of Brownian particles from walls due to an external force

Ordering of Brownian particles from walls due to an external force

Crystallization of Brownian Particles from Walls Induced by a Uniform External Force

Revealing Three-Dimensional Structure of an Individual Colloidal Crystal Grain by Coherent X-Ray Diffractive Imaging

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