Gold nanorod ribbon-like arrays as well as shape-separation effect of rods from sphere-like nanoparticles have been evaluated for identical nanorod suspension with various concentration of nanospheres. These sphere-rod mixtures are prepared with help of different amounts of AgNO₃. Deposits of nanoparticles at various positions of the coffee-stain ring are observed in different arrangements. For instance, face-to-face aligned nanorods get settled in ribbon-like superstructures and these arrays are observed to be self-separated from spheres. Self-assembly and shape-separation effect are observed more systematic at the outer-edges than the inner-region of the coffee-stain ring. Experimentally, it has been observed that face-to-face formation of nanorods in suspension is energetically more probable arrangement. As the separation between two nanorods increases, the depth of potential well decreases, indicating that the upper layers of nanorods are more under the influence of lower placed nanorods than those placed in the same plane. Energetically and sterically, more feasible arrangements are observed.

中文翻译：

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具有不同纳米球浓度的相同金纳米棒的能量和空间有利组装

金纳米棒带状阵列以及棒与球状纳米颗粒的形状分离效果已针对具有不同浓度纳米球的相同纳米棒悬浮液进行了评估。这些球棒混合物是在不同数量的 AgNO _{3的帮助下制备的}. 在不同的排列中观察到纳米颗粒在咖啡渍环的不同位置的沉积。例如，面对面排列的纳米棒固定在带状上层结构中，并且观察到这些阵列与球体自分离。自组装和形状分离效应在咖啡渍环的外边缘比内部区域更系统地观察到。实验上，已经观察到纳米棒在悬浮液中的面对面形成在能量上是更有可能的排列。随着两个纳米棒之间的距离增加，势阱的深度减小，表明纳米棒的上层比放置在同一平面上的纳米棒更受较低放置的纳米棒的影响。在能量和空间上，观察到更可行的安排。