In situ investigation of particle clustering dynamics in colloidal assemblies using fluorescence microscopy
In situ investigation of particle clustering dynamics in colloidal assemblies using fluorescence microscopy
复制标题
使用荧光显微镜原位研究胶体组件中的粒子聚类动力学
DOI：
10.1016/j.jcis.2020.04.054
复制
发表时间：
2020
影响因子：
9.9
通讯作者：
Won, Yoonjin
中科院分区：
文献类型：
--
作者：
Suh, Youngjoon;Gowda, Hamsa;Won, Yoonjin
胶体自组装是一种分散的物质在没有外界干预的情况下自发形成高阶结构的过程。在自组装过程中，堆积的颗粒会受到溶剂蒸发诱导的动态结构化阶段的影响，这导致称为晶界的微尺度缺陷。虽然必须精确控制详细的晶界以制造定义明确的自组装晶体，但由于当前可视化方法的分辨率有限，对控制晶界的胶体物理学的理解仍然是一个挑战。本工作通过研究一种新型的微尺度激光诱导荧光技术，对蒸发胶体组装过程中的粒子团簇动力学进行了实验研究。荧光显微镜以高保真度测量饱和度，以识别自组装过程中不同的胶体结构体系以及破裂机制。在这项工作中讨论的技术不仅使前所未有的水平的胶体自组装分析，但也有可能被用于各种传感应用与微观分辨率。
Colloidal self-assembly is a process in which dispersed matter spontaneously form higher-order structures without external intervention. During self-assembly, packed particles are subject to solvent-evaporation induced dynamic structuring phases, which leads to microscale defects called the grain boundaries. While it is imperative to precisely control detailed grain boundaries to fabricate well-defined self-assembled crystals, the understanding of the colloidal physics that govern grain boundaries remains a challenge due to limited resolutions of current visualization approaches. In this work, we experimentally reportin situparticle clustering dynamics during evaporative colloidal assembly by studying a novel microscale laser induced fluorescence technique. The fluorescence microscopy measures the saturation levels with high fidelity to identify distinct colloidal structuring regimes during self-assembly as well as cracking mechanics. The techniques discussed in this work not only enables unprecedented levels of colloidal self-assembly analysis but also have potential to be used for various sensing applications with microscopic resolutions.