Abstract
Core-shell structured electrorheological (ER) and magnetorheological (MR) particles have attracted increasing interest owing to their outstanding field-responsive properties, including morphology, chemical and dispersion stability, and rheological characteristics of shear stress and yield stress. This study covers recent progress in the preparation of core-shell structured materials as well as their critical characteristics and advantages. Broad emphasises from the synthetic strategy of various core-shell particles to their feature behaviours in the magnetic and electric fields have been elaborated.
Highlights
Core-shell structured materials belong to an interesting category of designed targeted particles with multi-functions and a variety of expected structures [1,2,3]
Electro- and magneto-responsive particles belong to a class of smart suspensions that can undergo a reversible phase transition between a liquid-like and a solid-like state in the presence of an electric or magnetic field
Diverse materials with high dielectric constants, good dispersion stabilities and low densities, such as dielectric inorganics, semi-conducing polar polymers, novel carbonaceous materials, and their composites have been investigated as ER particles
Summary
Core-shell structured materials belong to an interesting category of designed targeted particles with multi-functions and a variety of expected structures [1,2,3]. The ER activity depends on the morphological factors associated with preparing and maintaining a good dispersion of the materials In this respect, particles with a core-shell structure have shown promise in ER applications because of their remarkable ER properties, low cost and well controlled particle size [21,22]. Liu et al [32,33] have reported core-shell structured silica-encapsulated CI particles with a low particle density, enhanced oxidation-resistance and anti-acidic properties. Kim et al [39] prepared core-shell-structured Fe2O3-coated polystyrene particles using an eco-friendly Pickering emulsion polymerization method; and they examined the MR properties of the particles dispersed in silicone oil under various magnetic field strengths. This study reviews progress in the core-shell structured materials for use in ER/MR applications
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