填充胶体凝胶流变学：增强、硬化与可调性
Filled Colloidal Gel Rheology: Strengthening, Stiffening, and Tunability
AI总结：
本研究通过实验与模拟揭示了固体填充物对胶体凝胶流变特性的影响机制，发现填充单调增强屈服应力但弹性模量先增后降，并提出“填充物移除方案”实现对凝胶强度与脆性的单独调控。
摘要：
填充诱导的增强在材料科学中普遍存在，并在聚合物纳米复合材料中得到充分证实。尽管具有相似的成分，含有固体填充物的胶体凝胶表现出独特的流变学特性，这对工业（例如锂离子电池）具有实际意义，但其机理仍知之甚少。我们通过实验和模拟表明，填充单调增强胶体凝胶的屈服应力（即强度），而弹性模量（即刚度）先增加后降低。后一种软化效应源于致密填充下凝胶基质的结构受阻，表现为相间压力的增加。然而，这种结构受阻并未削弱抗屈服能力。相反，填充物通过渗透力链为凝胶骨架提供额外机械支撑，同时降低屈服应变。我们构建了该现象的力学机制图景，据此提出一种新型“填充物移除方案”，使对复合凝胶的强度和脆性的单独控制成为可能。
英文摘要：
Filler-induced strengthening is ubiquitous in materials science and is particularly well-established in polymeric nanocomposites. Despite having similar constituents, colloidal gels with solid filling exhibit distinct rheology, which is of practical interest to industry (e.g., lithium-ion batteries) yet remains poorly understood. We show, using experiments and simulations, that filling monotonically enhances the yield stress (i.e., strength) of colloidal gels while the elastic modulus (i.e., stiffness) first increases and then decreases. The latter softening effect results from a frustrated gel matrix at dense filling, evidenced by a growing inter-phase pressure. This structural frustration is, however, not detrimental to yielding resistance. Instead, fillers offer additional mechanical support to the gel backbone via percolating force chains, decreasing the yield strain at the same time. We develop a mechanistic picture of this phenomenology that leads us to a novel `filler-removal protocol,' making individual control over the strength and brittleness of a composite gel possible.
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。
