The rheology of field-responsive suspensions

TL;DR

This paper explores the rheological behavior of field-responsive suspensions, highlighting how external fields alter their viscosity and structure, with detailed analysis of single-particle dynamics and collective chain formations.

Contribution

It provides a comprehensive discussion of the rheology of field-responsive suspensions, including nonlinear particle dynamics and structural formation at moderate concentrations.

Findings

Anomalous viscosity behavior due to nonlinear particle dynamics

Formation of chains and fractal structures in suspensions

Open problems at high concentrations due to complex structures

Abstract

We present some aspects of the rheology of field-responsive suspensions, a class of field-responsive liquid matter systems possessing the ability to undergo significant changes in their strength upon application of an external field. Both the single-particle and the many-particle domains are discussed. In the former, consideration of the full nonlinear dynamics of the particles leads to an anomalous behavior of the viscosity whereas in the latter the most salient feature is the formation of chains and fractal structures. We indicate how to deal with the rheology at moderately concentrations leaving open the problem at higher concentrations for which the complexity of the emergent structures strongly limits the knowledge of their dynamics.