相分离液体中自发形成稳定毛细桥以固化致密胶体微结构的计算研究
Spontaneous Formation of Stable Capillary Bridges for Firming Compact Colloidal Microstructures in Phase Separating Liquids: A Computational Study
摘要：
利用计算机模拟研究了在相分离液体中紧密堆积的胶体颗粒之间自发形成的毛细桥。模拟揭示了一个自稳定机制，通过扩散平衡的两相液体形态。这种机制使得在液相分离过程中自发形成的毛细管桥具有所需的微观结构稳定性和均匀性。这种自稳定行为与相分离期间的常规粗化过程相反。讨论了分离液相的体积分数极限以及毛细管桥的粘附强度和热力学稳定性。毛细管桥形成在各种紧凑的胶体组件被认为是。这项研究揭示了一个有前途的路线，以在原位（在液体中）坚固的脆弱的胶体晶体和其他紧凑的胶体微结构，通过毛细管桥。
英文摘要：
Computer modeling and simulations are performed to investigate capillary bridges spontaneously formed between closely packed colloidal particles in phase separating liquids. The simulations reveal a self-stabilization mechanism that operates through diffusive equilibrium of two-phase liquid morphologies. Such mechanism renders desired microstructural stability and uniformity to the capillary bridges that are spontaneously formed during liquid solution phase separation. This self-stabilization behavior is in contrast to conventional coarsening processes during phase separation. The volume fraction limit of the separated liquid phases as well as the adhesion strength and thermodynamic stability of the capillary bridges are discussed. Capillary bridge formations in various compact colloid assemblies are considered. The study sheds light on a promising route to in-situ (in-liquid) firming of fragile colloidal crystals and other compact colloidal microstructures via capillary bridges.
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