The conductive suspensions composed of high content of graphite flakes dispersed in glycerol demonstrate flow field sensitive resistance and memory effect of the deformation history, which are expected to work as new fluidic soft sensors. The resistance of the suspensions responds to the local flow field caused by vibrations, stretching, and shear. The combined electro‐rheo tests are carried out to reveal the resistance response to different types of flow field. Based on the variations of resistance, a microstructural model considering the direction of the flow field and the corresponding transition kinetics of the different microstructures of fillers are established in the present work. The contents of the microstructures vary with both the shear strain and the shear direction and the transition rate between the different microstructures depended on the shear rate. The unveiled mechanism via the proposed model is expected to deepen the understanding of conductive suspensions so as to further guide the design of soft sensors based on conductive suspensions and composites.

中文翻译：

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高填充甘油/石墨悬浮液作为流体软传感器及其对剪切的响应机制

由分散在甘油中的高含量石墨薄片组成的导电悬浮液显示出对流场敏感的电阻和变形历史的记忆效应，有望用作新型流体软传感器。悬浮液的阻力响应由振动，拉伸和剪切引起的局部流场。进行了组合的流变试验，以揭示对不同类型流场的电阻响应。基于阻力的变化，在本工作中建立了考虑流场方向和填料不同微观结构的相应转变动力学的微观结构模型。显微组织的含量随剪切应变和剪切方向而变化，并且不同显微组织之间的转变速率取决于剪切速率。通过提出的模型揭示的机制有望加深对导电悬浮液的理解，从而进一步指导基于导电悬浮液和复合材料的软传感器的设计。