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Crystals 2016, 6(7), 80; doi:10.3390/cryst6070080

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

1
Department of Applied Chemistry, Graduate School of Science and Technology, Tokushima University, 2-1 Minamijosanjima, Tokushima 770-8506, Japan
2
Department of Chemical Science and Technology, Faculty of Engineering, Tokushima University, 2-1 Minamijosanjima, Tokushima 770-8506, Japan
3
Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
4
Faculty of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe, Mizuho, Nagoya, Aichi 467-8603, Japan
*
Author to whom correspondence should be addressed.
Academic Editors: Helmut Cölfen and Qingfeng Yan
Received: 8 June 2016 / Revised: 4 July 2016 / Accepted: 15 July 2016 / Published: 18 July 2016
(This article belongs to the Special Issue Colloidal Crystals)
View Full-Text   |   Download PDF [3067 KB, uploaded 18 July 2016]   |  

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. View Full-Text
Keywords: colloidal crystal; polystyrene particle; sodium polyacrylate; attractive interaction; surface diffusion; incorporation process colloidal crystal; polystyrene particle; sodium polyacrylate; attractive interaction; surface diffusion; incorporation process
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Suzuki, Y.; Hattori, Y.; Nozawa, J.; Uda, S.; Toyotama, A.; Yamanaka, J. Adsorption, Desorption, Surface Diffusion, Lattice Defect Formation, and Kink Incorporation Processes of Particles on Growth Interfaces of Colloidal Crystals with Attractive Interactions. Crystals 2016, 6, 80.

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