Colloidal crystallization utilizing interfaces of unidirectionally growing ice crystals
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- 作者：Yoshihisa Suzuki ; Gen Sazaki ; Kaori Hashimoto ; Takahisa Fujiwara ; Yoshinori Furukawa
- 关键词：A1. Directional solidification ; A1. Growth models ; A1. Nucleation ; B1. Nanomaterials ; B2. Nonlinear optic materials
- 刊名：Journal of Crystal Growth
- 出版年：2013
- 出版时间：15 November, 2013
- 年：2013
- 卷：383
- 期：Complete
- 页码：67-71
- 全文大小：1697 K
文摘
We show the possibility of unidirectional freezing of colloidal random suspensions as a novel method for growing colloidal crystals. First we confirmed the rejection of polystyrene particles from unidirectionally growing ice-water interfaces by observing color gradations of colloidal crystals formed in front of the interfaces. The rejection of particles from the growing interfaces increased particle concentration in the colloidal crystals. Then we succeeded in achieving colloidal crystallization in front of ice-water interfaces during the unidirectional freezing of water suspensions of polystyrene particles. The colloidal crystals thus obtained exhibited a columnar shape that is typically observed in the unidirectional colloidal crystallization using centrifugation.