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Relationship between rheology and structure of interpenetrating deforming and compressing microgels

机译:流变性与互穿变形和压缩微凝胶结构的关系

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摘要

Thermosensitive microgels are widely studied hybrid systems combining properties of polymers and colloidal particles in a unique way. Due to their complex morphology, their interactions and packing, and consequentially the viscoelasticity of suspensions made from microgels, are still not fully understood, in particular under dense packing conditions. Here we study the frequency-dependent linear viscoelastic properties of dense suspensions of micron sized soft particles in conjunction with an analysis of the local particle structure and morphology based on superresolution microscopy. By identifying the dominating mechanisms that control the elastic and dissipative response, we can explain the rheology of these widely studied soft particle assemblies from the onset of elasticity deep into the overpacked regime. Interestingly, our results suggest that the friction between the microgels is reduced due to lubrification mediated by the polymer brush-like corona before the onset of interpenetration.
机译:热敏性微凝胶是经过广泛研究的混合体系,以独特的方式结合了聚合物和胶体颗粒的特性。由于它们复杂的形态,它们的相互作用和堆积以及因此由微凝胶制成的悬浮液的粘弹性,仍未被完全理解,特别是在稠密的堆积条件下。在这里,我们结合超分辨率显微镜对局部颗粒结构和形态的分析,研究了微米级软颗粒致密悬浮液的频率依赖性线性粘弹性。通过确定控制弹性和耗散响应的主要机制,我们可以从弹性开始到深层填充状态来解释这些被广泛研究的软颗粒组件的流变学。有趣的是,我们的结果表明,在渗透之前,由于聚合物刷状电晕介导的润滑作用,微凝胶之间的摩擦减小了。

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