AI 中文总结
本研究以表面刷密度为控制参数调控胶体耗竭凝胶流变学，发现低刷密度可加速凝胶化、提升力学性能并改变网络结构与动力学，为相关流变调控提供实验可行的参数。
AI 中文摘要
我们采用表面接枝聚合物的密度作为保持几何结构的控制参数，来调控胶体耗竭凝胶的流变学性质。降低刷密度会加速凝胶化过程，得到的凝胶具有更高的平台储能模量和屈服应力。这种力学增强并非伴随局部致密化程度的提高；与高刷密度的凝胶相比，低刷密度网络的平均接触数更低、空间异质性更小，却表现出更强的弹性响应。我们的研究结果表明，低刷密度凝胶网络形成弹性节点的配位阈值更低。此外，低刷密度凝胶的弛豫更缓慢、蠕变变形积累更少，在软玻璃态流变学（Soft Glassy Rheology）框架内表现出更低的有效噪声温度。这些结果确立了表面刷密度作为一种实验可及的控制参数，可调控胶体耗竭凝胶的流变学，同时伴随有效吸引力、网络结构和接触运动学的耦合变化。
英文摘要
We use the density of surface-grafted polymers as a geometry-preserving control parameter for tuning the rheology of colloidal depletion gels. Reducing brush density accelerates gelation and produces gels with higher plateau storage modulus and yield stress. This mechanical enhancement is not accompanied by increased local densification; low-brush networks exhibit lower average contact number and reduced spatial heterogeneity while displaying stronger elastic responses than their high-brush counterparts. Our findings demonstrate a reduced coordination threshold to form elastic nodes in the low-brush gel network. In addition, low-brush gels relax more slowly, accumulate less creep deformation, and exhibit lower effective noise temperatures within the Soft Glassy Rheology framework. These results establish surface-brush density as an experimentally accessible control parameter for colloidal depletion gel rheology with coupled changes in effective attraction, network architecture, and contact kinematics.
