Analysis of the rheology of magnetic bidisperse suspensions in the regime of discontinuous shear thickening

IF 2.3 3区工程技术 Q2 MECHANICS Rheologica Acta Pub Date : 2023-02-23 DOI:10.1007/s00397-023-01388-x

Georges Bossis, Alain Ciffreo, Yan Grasselli, Olga Volkova

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Abstract

The phenomenon of discontinuous shear thickening (DST) is observed in suspensions of solid particles with a very high-volume fraction. For suspensions of ferromagnetic particles, this transition can also be triggered by the application of a magnetic field as discussed by Bossis et al. (2016). Here, we explore the rheological behavior of a bidisperse suspension made of magnetic-carbonyl iron (CI) and non-magnetic-calcium carbonate (CC) particles with a brush-like coating of the same superplasticizer molecule. We highlight the synergetic effect of non-magnetic particles whose inclusion in the percolated frictional network amplifies the effect of the magnetic field on the remaining fraction of magnetic particles. In plate-plate geometry, a small fraction of ferromagnetic particles (about 5%) is sufficient to trigger the transition by the application of a magnetic field and optimum for the increase of viscosity. The progressive interpenetration of the coating layers of polymer and the demagnetizing field can explain this behavior.

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磁性双分散悬浮液在不连续剪切增稠状态下的流变学分析

在体积分数很高的固体颗粒悬浮液中观察到不连续剪切增稠现象。对于铁磁性颗粒的悬浮液，正如Bossis等人(2016)所讨论的那样，这种转变也可以通过施加磁场来触发。在这里，我们探索了由磁性羰基铁(CI)和非磁性碳酸钙(CC)颗粒组成的双分散悬浮液的流变行为，这些颗粒具有相同的高效减水剂分子的刷状涂层。我们强调了非磁性颗粒的协同效应，它们在渗透摩擦网络中的包含放大了磁场对剩余磁性颗粒的影响。在板-板几何中，一小部分铁磁性颗粒(约5%)足以通过施加磁场触发转变，并且最适合增加粘度。聚合物涂层的逐渐互渗和退磁场可以解释这种行为。图形抽象

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来源期刊

Rheologica Acta 物理-力学

CiteScore

4.60

自引率

8.70%

发文量

审稿时长

3 months

期刊介绍： "Rheologica Acta is the official journal of The European Society of Rheology. The aim of the journal is to advance the science of rheology, by publishing high quality peer reviewed articles, invited reviews and peer reviewed short communications. The Scope of Rheologica Acta includes: - Advances in rheometrical and rheo-physical techniques, rheo-optics, microrheology - Rheology of soft matter systems, including polymer melts and solutions, colloidal dispersions, cement, ceramics, glasses, gels, emulsions, surfactant systems, liquid crystals, biomaterials and food. - Rheology of Solids, chemo-rheology - Electro and magnetorheology - Theory of rheology - Non-Newtonian fluid mechanics, complex fluids in microfluidic devices and flow instabilities - Interfacial rheology Rheologica Acta aims to publish papers which represent a substantial advance in the field, mere data reports or incremental work will not be considered. Priority will be given to papers that are methodological in nature and are beneficial to a wide range of material classes. It should also be noted that the list of topics given above is meant to be representative, not exhaustive. The editors welcome feedback on the journal and suggestions for reviews and comments."

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