Magnetically driven in-plane modulation of the 3D orientation of vertical ferromagnetic flakes

Ferrand, Hortense Le; Arrieta, Andres F.

doi:10.1039/d1sm01423d

Cited by 6 publications

(3 citation statements)

References 66 publications

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“…Some differences with the computational results may be due to experimental defects, such as particle tilting and misorientation due to lower magnetic field strength away from the magnet. Indeed, we reported on in-plane magnetic tilting in another work and expect that large experimental specimens might be subject to this defect [41]. Incorporating local tilting and other orientation inhomogeneity in the FEM model would help refine the prediction, as shown with the study of the position of the magnet and its effect on the orientation of the flakes and the resulting shapes [30].…”

Section: 4| Towards Plant Inspired Geometriesmentioning

confidence: 88%

Plant-inspired multi-stimuli and multi-temporal morphing composites

Ferrand¹,

Riley²,

Arrieta³

2022

Bioinspir. Biomim.

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Plants are inspiring models for adaptive, morphing systems. In addition to their shape complexity, they can respond to multiple stimuli and exhibit both fast and slow motion. We attempt to recreate these capabilities in synthetic structures, proposing a fabrication and design scheme for multi stimuli and multi temporal responsive plant-inspired composites. We leverage a hierarchical, spatially tailored microstructural and compositional scheme to enable both fast morphing through bistability and slow morphing through diffusion processes. The composites consisted of a hydrogel layer made of gelatine and an architected particle-reinforced epoxy bilayer. Using magnetic fields to achieve spatially distributed orientations of magnetically responsive platelets in each epoxy layer, complex bilayer architectural patterns in various geometries were realised. This feature enabled the study of plant-inspired complex designs, via finite element analysis and experiments. We present the design and fabrication strategy utilizing the material properties of the composites. The deformations and temporal responses of the resulting composites are analysed using digital image correlation. Finally, we model and experimentally demonstrate plant-inspired composite shells whose stable shapes closely mimic those of the Venus flytrap, while maintaining the multi stimuli and multi temporal responses of the materials. The key to achieve this is to tune the local in plane orientations of the reinforcing particles in the bilayer shapes, to induce distributed in plane mechanical properties and shrinkage. How these particles should be distributed is determined using finite element modelling. The work presented in this study can be applied to autonomous applications such as robotic systems.

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Section: 4| Towards Plant Inspired Geometriesmentioning

confidence: 88%

Plant-inspired multi-stimuli and multi-temporal morphing composites

Ferrand¹,

Riley²,

Arrieta³

2022

Bioinspir. Biomim.

Self Cite

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“…Furthermore, the orientation of 2D nanomaterials has been achieved by combining 3D printing techniques with an external magnetic field, electric field and temperature gradient, to introduce particle alignment in a programmable fashion. 226,280 Martin et al utilized the 3D magnetic printing method to fabricate complex oriented architectures using anisotropic 2D particles. 281 The particles were oriented and patterned during printing using magnetic fields, where a digital light processor was used to cure the resin (Fig.…”

Section: D Nanomaterials Alignment Supported By 3d Printingmentioning

confidence: 99%

Controlled local orientation of 2D nanomaterials in 3D devices: methods and prospects for multifunctional designs and enhanced performance

Guan

Ferrand

2022

J. Mater. Chem. A

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“…For the magnetic field alignment method, while a static magnetic field (SMF) may result in partial alignment, a rotating magnetic field (RMF, or shortened as magnetic field if not specified) is commonly applied to achieve planar alignment. [19,31,32] However, the external-field-assisted approach only works for 2D materials as fillers in a low-viscosity matrix/medium contained in a mold, and the shape of resulting 3D composite structures is defined by molds.…”

Section: Introductionmentioning

confidence: 99%

Sequential Dual Alignments Introduce Synergistic Effect on Hexagonal Boron Nitride Platelets for Superior Thermal Performance

Chen,

Gao,

Hoo

et al. 2024

Advanced Materials

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Planarly aligning two‐dimensional (2D) platelets is challenging due to their additional orientational freedom compared to one‐dimensional materials. This study reports a sequential dual‐alignment approach, employing an extrusion printing‐induced shear force and rotating magnetic field‐induced force couple for platelet planarly alignment in a yield‐stress support bath. It is hypothesized that the partial alignment induced by a directional shear force facilitates subsequent axial rotation of the platelets for planar alignment under an external force couple, resulting in a synergistic alignment effect. This sequential dual‐alignment approach achieves better planar alignment of 2D modified hexagonal boron nitride (mhBN). Specifically, the thermal conductivity of the 40 wt% mhBN/epoxy composite is significantly higher (692%) than that of unaligned composites, surpassing the cumulative effect of individual methods (only 133%) with a five‐time more synergistic effect. For 30, 40, and 50 wt% mhBN composites, the thermal conductivity values (5.9, 9.5, and 13.8 W m−1 K−1) show considerable improvement compared to the previously reported highest values (5.3, 6.6, and 8.6 W m−1 K−1). Additionally, a three‐dimensional (3D) mhBN/epoxy heat sink is printed and evaluated to demonstrate the feasibility of device fabrication. The approach will enable the planar alignment of electrically or thermally conducting 2D fillers during 3D fabrication.This article is protected by copyright. All rights reserved

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Magnetically driven in-plane modulation of the 3D orientation of vertical ferromagnetic flakes

Abstract: External magnetic fields are known to attract and orient magnetically responsive colloidal particles. In the case of 2D microplatelets, rotating magnetic fields are typically used to orient them parallel to...

Cited by 6 publications

References 66 publications

Plant-inspired multi-stimuli and multi-temporal morphing composites

Plant-inspired multi-stimuli and multi-temporal morphing composites

Controlled local orientation of 2D nanomaterials in 3D devices: methods and prospects for multifunctional designs and enhanced performance

Sequential Dual Alignments Introduce Synergistic Effect on Hexagonal Boron Nitride Platelets for Superior Thermal Performance

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