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Very recently, the construction of twist actuators from magnetorheologicalgels and elastomers has been suggested. These materials consist of magnetizablecolloidal particles embedded in a soft elastic polymeric environment. The twistactuation is enabled by a net chirality of the internal particle arrangement.Upon magnetization by a homogeneous external magnetic field, the systemsfeature an overall torsional deformation around the magnetization direction.Starting from a discrete minimal mesoscopic model set-up we work towards amacroscopic characterization. The two scales are linked by identifyingexpressions for the macroscopic system parameters as functions of themesoscopic model parameters. In this way, the observed behavior of amacroscopic system can in principle be mapped to and illustratively beunderstood from an appropriate mesoscopic picture. Our results apply equallywell to corresponding soft electrorheological gels and elastomers.

Stimuli-responsive twist actuators made from soft elastic composite materials -- linking mesoscopic and macroscopic descriptions