Two-Dimensional Directed Assembly of Dicolloids

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• 作者：Mark M. Panczyk ; Jin-Gyu Park ; Norman J. Wagner ; Eric M. Furst
• 刊名：Langmuir
• 出版年：2013
• 出版时间：January 8, 2013
• 年：2013
• 卷：29
• 期：1
• 页码：75-81
• 全文大小：655K
• 年卷期：v.29,no.1(January 8, 2013)
• ISSN：1520-5827

文摘

The assembly of ordered dicolloid monolayers is directed by an electric field. The dicolloid particles are polystyrene latex with a maximum equatorial diameter 3.45 渭m and length 4.63 渭m. The monolayer structure is characterized using small-angle light scattering and bright-field microscopy. With increasing field strength from 26.7 to 200 V_RMS/cm, a transition from a disordered monolayer, to first orientationally ordered, and then translationally ordered two-dimensional (2D) arrays occurs. A c2mm plane group symmetry dominates the ordered structure but is present alongside structures with p2 symmetry, leading to a spread in the angular distribution of the light scattering peaks. The order鈥揹isorder transition dependence on field strength and frequency is similar to that observed for colloidal spheres; at higher frequencies, stronger fields are required to assemble particles. Optimal ordered structures reflect a balance between inducing sufficiently strong interparticle interactions while limiting the rate of formation to ensure the growth of large crystalline domains.