The self-assembly of the concave particles

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Journal of Nanjing University(Natural Sciences) ›› 2014, Vol. 50 ›› Issue (1) : 23.

Cheng Zhifeng1, Luo Fuhua2

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Abstract

Recently, there is a growing interest in studying the concave colloidal particles due to their unique directional and shape-recognition assemblies. In order to study this special assembly phenomenon, we creatively used the dispersion polymerization to design and fabricate concave colloidal particles with different number of dimples: the single-dimple colloids and the multi-dimple colloids. With uniform size and smooth surface, these two types of dimpled colloids are ideal model to study the self-assembly of concave particles. In addition we investigated the directed self-assembly ofthe single-dimple colloids and the specific bonding of the multi-dimple colloids. In an alternating electric field,the single-dimple colloids tend to move with a side-direction way. This special movement would induce directional self-assemblies between the aggregated particles. Using the multi-dimple colloids as the "lock" particles, and the polystyrene spheres as the "key" particles, the lock-and-key self-assembly by depletion attraction is explored in this article. The results demonstrate a variety of bonding possibilities existing among the multi-dimple particles and spherical particles. Besides, we also discussed formation mechanism of the lock-and-key

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Cheng Zhifeng1, Luo Fuhua2. The self-assembly of the concave particles[J]. Journal of Nanjing University(Natural Sciences), 2014, 50(1): 23

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