2023
DOI: 10.21203/rs.3.rs-2748533/v1
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Programming structural and magnetic anisotropy for tailored interaction and control of soft microrobots

Abstract: Swarms of soft microrobots controlled by minimally invasive magnetic fields show promise as potential biomedical agents. The collective behaviour of such swarms, governed by magnetic and hydrodynamic interactions, emerges from the properties of their individual constituents. The introduction of anisotropy into microrobots, including both magnetic and structural anisotropy, expands the possibilities space for tailoring and predetermining the interactions and collective behaviours that result. However, the metho… Show more

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“…One recent advance in this area is the fabrication of composite particles made of a nonmagnetic material such as a hydrogel or elastomer within which magnetic nanoparticle (MNP) assemblies are embedded. Such magnetically responsive composites could find diverse applications such as actuators, microbots, magnetorheological fluids, magnetically controllable colloidal crystals, , and biological manipulation. While the assembly behavior of magnetic nanoparticles in bulk systems or large domains has been reported in multiple studies, ,,,,, an emerging question is how magnetically responsive particles assemble in confined microdomains. In such cases, the patterns formed by the assembled particles not only depend on the strength of the magnetic field, but also on topological constraints such as geometry of the confining environment and the particle packing. Normally, in the absence of field interactions, hard particles can transition from a disordered fluid into an ordered crystal or other organized structures due to the spatial confinement. , In those cases, confinement mediates the entropy effects to determine the final structures of the assemblies.…”
Section: Introductionmentioning
confidence: 99%
“…One recent advance in this area is the fabrication of composite particles made of a nonmagnetic material such as a hydrogel or elastomer within which magnetic nanoparticle (MNP) assemblies are embedded. Such magnetically responsive composites could find diverse applications such as actuators, microbots, magnetorheological fluids, magnetically controllable colloidal crystals, , and biological manipulation. While the assembly behavior of magnetic nanoparticles in bulk systems or large domains has been reported in multiple studies, ,,,,, an emerging question is how magnetically responsive particles assemble in confined microdomains. In such cases, the patterns formed by the assembled particles not only depend on the strength of the magnetic field, but also on topological constraints such as geometry of the confining environment and the particle packing. Normally, in the absence of field interactions, hard particles can transition from a disordered fluid into an ordered crystal or other organized structures due to the spatial confinement. , In those cases, confinement mediates the entropy effects to determine the final structures of the assemblies.…”
Section: Introductionmentioning
confidence: 99%