Journal Article Dependence of the apex angle of an inverted pyramidal-shaped container on crystallization of Brownian particles

Kanatsu, Youhei  ,  Sato, Masahide

84 ( 11 )  , p.114601 , 2015-11-15 , Physical Society of Japan = 日本物理学会 (JPS)
Large grains of a close-packed colloidal crystal have been experimentally shown to form in an inverted pyramidal pit by sedimentation [S. Matsuo et al., Appl. Phys. Lett. 82, 4285 (2003)]. Keeping this experiment in mind, we study the crystallization of Brownian particles. We carry out Brownian dynamics simulations in an inverted pyramidal-shaped container. The Brownian particles settle out toward the apex of the container by a uniform external force. If the apex angle is suitable, large grains with the face-centered cubic (fcc) structure are formed [Y. Kanatsu and M. Sato, J. Phys. Soc. Jpn. 84, 044601 (2015)]. When the apex angle deviates from a suitable value, the number of hexagonal closepacked (hcp) structured particles, Nhcp, increases with increasing angle deviation. The formation of the hcp structure is induced by disordered particles remaining in the center region of the container. Copyright © 2015 The Physical Society of Japan.
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