环状胶体染料中的有序-无序转变
Order-to-disorder transition in ring-shaped colloidal stains
摘要：
从表面蒸发的胶体分散液滴，如干燥的咖啡滴，留下明显的环形污渍。虽然这种机制经常用于粒子自组装，但结晶的条件仍然不清楚。我们的单分散胶体颗粒的实验揭示了染色剂的结构转变，从有序的晶体无序包装。我们表明，这种急剧的转变起源于一个时间的奇异性的蒸发液滴内的流速在其生命的结束。当沉积速度较低时，颗粒有时间通过布朗运动排列，而在最后，高速颗粒被堵塞成无序相。
英文摘要：
A colloidal dispersion droplet evaporating from a surface, such as a drying coffee drop, leaves a distinct ring-shaped stain. Although this mechanism is frequently used for particle self-assembly, the conditions for crystallization have remained unclear. Our experiments with monodisperse colloidal particles reveal a structural transition in the stain, from ordered crystals to disordered packings. We show that this sharp transition originates from a temporal singularity of the flow velocity inside the evaporating droplet at the end of its life. When the deposition speed is low, particles have time to arrange by Brownian motion, while at the end, high-speed particles are jammed into a disordered phase.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
