Identification of triangular-shaped defects often appeared in hard-sphere crystals grown on a square pattern under gravity by Monte Carlo simulations

Mori, Ayumi; Suzuki, Yoshihisa

doi:10.1016/j.physb.2014.07.012

Cited by 3 publications

(5 citation statements)

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“…A triangular-shaped defect, as shown in Figure 8, is remarkable. This extended defect was later identified with a stacking fault tetrahedron [97]. After successfully replacing the stress that forced the growth direction to fcc x001y, we examined the sudden switch-on of gravity [101] (some details are given in Section 4.3 because they relate more closely to this section).…”

Section: Colloidal Epitaxymentioning

confidence: 99%

“…For the functionalization of a colloidal crystal such as an optical waveguide, designed defects must be incorporated in the crystal. Such defect engineering can be performed by the sedimentation method using a template with regular lattice by varying the lattice spacing, as pointed out in Reference [97] and as explained as follows. It has been experimentally found that defects in colloidal crystals grown on a template are not triangular, but parallelepiped [103].…”

Section: Gravitational Annealing/temperingmentioning

confidence: 99%

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Computer Simulations of Crystal Growth Using a Hard-Sphere Model

Mori

2017

Crystals

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A review of computer simulation studies on crystal growth in hard-sphere systems is presented. A historical view on the crystallization of hard spheres, including colloidal crystallization, is given in the first section. Crystal phase transition in a system comprising particles without bonding is difficult to understand. In the early days, therefore, many researchers did not accept such crystalline structures as crystals that should be studied in the field of crystal growth. In the last few decades, however, colloidal crystallization has drawn attention because in situ observations of crystallization process has become possible. Next, simulation studies of the crystal/fluid interface of hard spheres are also reviewed. Although colloidal crystallization has now been recognized in the crystal growth field, the stability of the crystal-fluid coexistence state has still not been satisfactorily understood based on a bond-breaking picture, because of an infinite diffuseness of the interfaces in non-bonding systems derived from this picture. Studies of sedimentary colloidal crystallization and colloidal epitaxy using the hard-sphere model are lastly reviewed. An advantage of the colloidal epitaxy is also presented; it is shown that a template not only fixes the crystal growth direction, but also improves the colloidal crystallization. A new technique for reducing defects in colloidal crystals through the gravity effect is also proposed.

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Section: Colloidal Epitaxymentioning

confidence: 99%

Section: Gravitational Annealing/temperingmentioning

confidence: 99%

Computer Simulations of Crystal Growth Using a Hard-Sphere Model

Mori

2017

Crystals

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“…However, almost all systems reported so far have mainly utilized repulsive interactions between particles for colloidal crystallization basically [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]20,21,[25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][42][43][44], whereas the growth of crystals of atoms or molecules usually proceeds via attractive interactions. In such systems, in situ observation of growth interfaces of colloidal crystals by optical microscopy is usually difficult because of high particle concentrations.…”

Section: Introductionmentioning

confidence: 99%

Adsorption, Desorption, Surface Diffusion, Lattice Defect Formation, and Kink Incorporation Processes of Particles on Growth Interfaces of Colloidal Crystals with Attractive Interactions

et al. 2016

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Abstract:Good model systems are required in order to understand crystal growth processes because, in many cases, precise incorporation processes of atoms or molecules cannot be visualized easily at the atomic or molecular level. Using a transmission-type optical microscope, we have successfully observed in situ adsorption, desorption, surface diffusion, lattice defect formation, and kink incorporation of particles on growth interfaces of colloidal crystals of polystyrene particles in aqueous sodium polyacrylate solutions. Precise surface transportation and kink incorporation processes of the particles into the colloidal crystals with attractive interactions were observed in situ at the particle level. In particular, contrary to the conventional expectations, the diffusion of particles along steps around a two-dimensional island of the growth interface was not the main route for kink incorporation. This is probably due to the number of bonds between adsorbed particles and particles in a crystal; the number exceeds the limit at which a particle easily exchanges its position to the adjacent one along the step. We also found novel desorption processes of particles from steps to terraces, attributing them to the assistance of attractive forces from additionally adsorbing particles to the particles on the steps.

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“…For example, a close-packed colloidal crystal with the face-centered cubic (fcc) structure is used as a template for an inverse opal with a three-dimensional full photonic band gap. 1) Sedimentation [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] is often used in order to form the close-packed colloidal crystals. When colloidal particles precipitate on the flat bottom wall during sedimentation, a triangular lattice is formed on the wall.…”

Section: Introductionmentioning

confidence: 99%

“…Fabricating the bottom wall of a container 3,4,9,17,18) is one of the ways to prevent the formation of a mixture of different types of small grains. Recently, van Blaaderen et al used the method called colloidal epitaxy to prevent the formation of a mixture of fcc and hcp structured particles.…”

Section: Introductionmentioning

confidence: 99%

Dependence of crystallization of Brownian particles by sedimentation on the force direction

Sato¹,

Widianto²,

Kanatsu³

2015

Jpn. J. Appl. Phys.

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The formation of a large close-packed colloidal crystal with the fcc structure was observed during the sedimentation of colloidal particles in an inverted pyramidal pit [S. Matsuo et al., Appl. Phys. Lett. 82, 4285 (2003)]. Carrying out Brownian dynamics simulations, we confirmed that large grains with the fcc structure are formed when the apex angle of the inverted pyramidal container is suitable and the force direction is parallel to the the center axis [Y. Kanatsu and M. Sato, J. Phys. Soc. Jpn. 84, 044601 (2015)].To form a high-quality colloidal crystal without defects, it is important to investigate in detail how the quality of a colloidal crystal is affected by the force direction and container shape. In this paper, we focus on the effect of the force direction on crystal quality and investigate how the ratio of the number of the hcp structured particles, N hcp , to that of fcc structured particles, N fcc , is affected by the force direction.In our simulation, the ratio of N fcc to N hcp is hardly changed when the force direction deviates from the central axis: N fcc is much larger than N hcp irrespective of the force direction. Thus, our results show that the crystal structure is insensitive to the force direction in forming a colloidal crystal by sedimentation in an inverted pyramidal container.

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Identification of triangular-shaped defects often appeared in hard-sphere crystals grown on a square pattern under gravity by Monte Carlo simulations

Cited by 3 publications

References 35 publications

Computer Simulations of Crystal Growth Using a Hard-Sphere Model

Computer Simulations of Crystal Growth Using a Hard-Sphere Model

Adsorption, Desorption, Surface Diffusion, Lattice Defect Formation, and Kink Incorporation Processes of Particles on Growth Interfaces of Colloidal Crystals with Attractive Interactions

Dependence of crystallization of Brownian particles by sedimentation on the force direction

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