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微流动驱动的胶体自组装是一种非平衡的过程。在定向微流动(如热毛细流)驱动下,胶体体系内的粒子自身的热运动受到抑制,胶体体系中的微粒常常出现宏观有序的结构。但这种粒径的球在重力作用下会显著沉降,造成胶体体系的浓度不均,而胶体体系的相行为与浓度密切相关。因此在重力作用下难以准确地描述相变与局域结构的关联。在微重力条件下,大尺度的胶体球没有重力沉降作用,可提供准确的局域结构信息,而且浮力对流受到较大抑制,没有流体静压力,不产生沉降作用,这为研究界面上的胶体自组装动力学行为提供了有利条件。“胶体有序排列及新型材料研究”是“实践十号卫星”19项科学实验载荷之一,其科学实验将在载荷“胶体材料箱”中完成,将是空间中进行的首次胶体自组装动力学行为的实验研究。
Microfluid-driven colloidal self-assembly is a non-equilibrium process. Driven by directional microfluidics (such as hot capillary flow), the thermal movement of the particles within the colloidal system is suppressed, and the particles in the colloidal system often exhibit macroscopically ordered structures. However, the size of the ball under the gravity will be significantly subsidence, resulting in uneven concentration of colloidal system, while the colloidal phase behavior and concentration are closely related. Therefore, it is difficult to accurately describe the relationship between phase transition and local structure under the action of gravity. Under microgravity conditions, large-scale colloidal spheres do not have the effect of gravity sedimentation and provide accurate local structure information. Moreover, the buoyancy convection is greatly restrained, and there is no hydrostatic pressure and no sedimentation effect. Self-assembly kinetic behavior provides favorable conditions. “Colloidal order of arrangement and new material research ” is “one of the practice of 10 satellites ” 19 scientific experiment load, the scientific experiment will be completed in the load “colloidal material box ”, will be carried out in space The experimental study of the first colloidal self-assembly kinetic behavior.