凝胶网络重构协同过程的微观图像
Microscopic Picture of Cooperative Processes in Restructuring Gel Networks
摘要：
胶体凝胶网络是无序的弹性固体，甚至可以在极稀的颗粒悬浮液中形成。由于相互作用强度与热能相当，它们的应力承载网络可以通过破坏和重组颗粒间键来局部重组。这允许变形下的屈服、自我修复和自适应机制。设计这样的特征需要通过凝胶的复杂结构控制应力传递，这是具有挑战性的，因为网络的局部重构和整体响应之间的联系仍然缺失。在这里，我们使用空间分辨分析的动力学过程和数值模拟模型凝胶深入了解这一联系。我们发现，局部键断裂的后果传播沿凝胶网络的距离大于平均网格尺寸。这为为什么非局部本构关系对于合理化胶体凝胶的非平凡力学响应是必要的提供了缺失的微观解释。
英文摘要：
Colloidal gel networks are disordered elastic solids that can form even in extremely dilute particle suspensions. With interaction strengths comparable to the thermal energy, their stress-bearing network can locally restructure via breaking and reforming interparticle bonds. This allows for yielding, self-healing, and adaptive mechanics under deformation. Designing such features requires controlling stress transmission through the complex structure of the gel and this is challenging because the link between local restructuring and overall response of the network is still missing. Here, we use a space resolved analysis of dynamical processes and numerical simulations of a model gel to gain insight into this link. We show that consequences of local bond breaking propagate along the gel network over distances larger than the average mesh size. This provides the missing microscopic explanation for why nonlocal constitutive relations are necessary to rationalize the nontrivial mechanical response of colloidal gels.
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