Magnetic nanoparticles in a colloidal solution self-assemble in various aligned structures, which has a profound influence on the flow behavior. However, the precise role of the microstructure in the development of the rheological response has not been reliably quantified. We investigate the self-assembly of dipolar colloids in simple shear using hybrid molecular dynamics and multi-particle collision dynamics simulations with explicit coarse-grained hydrodynamics, conduct simulated rheometric studies and apply micromechanical models to produce master curves, showing evidence of the universality of the structural behavior governed by the competition between the bonding (dipolar) and erosive (thermal and/or hydrodynamic) stresses. The simulations display viscosity changes across several orders of magnitude in fair quantitative agreement with various literature sources, substantiating the universality of the approach, which seems to apply generally across vastly different length scales and a broad range of physical systems.

中文翻译：

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多粒子碰撞动力学研究简单剪切中偶极胶体的自组装和流变学

胶体溶液中的磁性纳米粒子会以各种排列的结构自组装，这对流动行为产生了深远的影响。但是，在流变响应发展中的微观结构的确切作用尚未可靠地量化。我们使用混合分子动力学和具有明确粗粒流体力学的多粒子碰撞动力学模拟研究了单剪切胶体中偶极胶体的自组装，进行了流变学研究并应用微机械模型制作了主曲线，从而证明了通用性的证据。结构行为受键合（偶极）和侵蚀性（热和/或流体动力）应力之间的竞争支配。