This article explores the governing role of the internal hydrodynamics and advective transport within sessile colloidal droplets on the self assembly of nanostructures to form floral patterns. Water acetone binary fluid and Bi2O3 nanoflakes based complex fluids are experimented with. Microliter sessile droplets are allowed to vaporize and the dry out patterns are examined using scanning electron microscopy. The presence of distributed self assembled rose like structures is observed. The population density, structure and shape of the floral structures are noted to be dependent on the binary fluid composition and nanomaterial concentration. Detailed microscopic particle image velocimetry analysis is undertaken to qualitatively and quantitatively describe the solutal Marangoni advection within the evaporating droplets. It has been shown that the kinetics, regime and location of the internal advection are responsible factors towards the hydrodynamics influenced clustering, aggregation and self-assembly of the nanoflakes. In addition, the size of the nanostructures and the complex fluids.

中文翻译：

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平流动力学诱导胶体纳米薄片自组装成微米级花卉结构

本文探讨了固着胶体液滴内的内部流体动力学和对流传输对纳米结构自组装形成花卉图案的控制作用。对水丙酮二元流体和基于 Bi2O3 纳米薄片的复杂流体进行了实验。允许微升固着液滴蒸发，并使用扫描电子显微镜检查干燥图案。观察到分布的自组装玫瑰状结构的存在。注意到花卉结构的种群密度、结构和形状取决于二元流体成分和纳米材料浓度。进行详细的微观粒子图像测速分析，以定性和定量地描述蒸发液滴内的溶质 Marangoni 平流。已经表明，内部平流的动力学、状态和位置是影响纳米薄片聚集、聚集和自组装的流体动力学的重要因素。此外，纳米结构和复杂流体的大小。