Metamaterial Design: Decoupling Minimal Surface Metamaterial Properties Through Multi‐Material Hyperbolic Tilings (Adv. Funct. Mater. 30/2021)

Callens, Sebastien J.P.; Arns, Christoph H.; Kuliesh, Alina; Zadpoor, Amir A.

doi:10.1002/adfm.202170214

Cited by 6 publications

(6 citation statements)

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“…At first, we selected a series of 3D objects with convoluted pore distribution from a pool of mathematically defined triple periodic minimal surface structures. This class of geometries is well‐known in the field of tissue engineering, as lattices belonging to this family have been investigated to produce mechanical metamaterials, [ 62 ] to maximize cell seeding in polymeric scaffolds, [ 63 ] and to promote in vivo bone ingrowth in biomaterials‐based implants, [ 64 ] among other applications. Specifically, we selected three lattice structures with interconnected porosity: Schwarz D, Schwarz G, and Schwarz P. [ 65–68 ] At a comparable volume (between 383.17 and 394.25 mm 3 ), these structures show a decrease in surface area to volume ratio (from 2.05 to 1.88 mm −1 ), and decreasing average tortuosity of the porous network (from 1.32 to 1.04) respectively.…”

Section: Resultsmentioning

confidence: 99%

Volumetric Bioprinting of Organoids and Optically Tuned Hydrogels to Build Liver‐Like Metabolic Biofactories

et al. 2022

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Organ‐ and tissue‐level biological functions are intimately linked to microscale cell–cell interactions and to the overarching tissue architecture. Together, biofabrication and organoid technologies offer the unique potential to engineer multi‐scale living constructs, with cellular microenvironments formed by stem cell self‐assembled structures embedded in customizable bioprinted geometries. This study introduces the volumetric bioprinting of complex organoid‐laden constructs, which capture key functions of the human liver. Volumetric bioprinting via optical tomography shapes organoid‐laden gelatin hydrogels into complex centimeter‐scale 3D structures in under 20 s. Optically tuned bioresins enable refractive index matching of specific intracellular structures, countering the disruptive impact of cell‐mediated light scattering on printing resolution. This layerless, nozzle‐free technique poses no harmful mechanical stresses on organoids, resulting in superior viability and morphology preservation post‐printing. Bioprinted organoids undergo hepatocytic differentiation showing albumin synthesis, liver‐specific enzyme activity, and remarkably acquired native‐like polarization. Organoids embedded within low stiffness gelatins (<2 kPa) are bioprinted into mathematically defined lattices with varying degrees of pore network tortuosity, and cultured under perfusion. These structures act as metabolic biofactories in which liver‐specific ammonia detoxification can be enhanced by the architectural profile of the constructs. This technology opens up new possibilities for regenerative medicine and personalized drug testing.

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Section: Resultsmentioning

confidence: 99%

Volumetric Bioprinting of Organoids and Optically Tuned Hydrogels to Build Liver‐Like Metabolic Biofactories

et al. 2022

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“…The elastic constitutive model of the metastructure can be calculated using the asymptotic homogenization (AH) method, [ 42 ] and the anisotropic index A H is used to evaluate the anisotropy of the structures at different densities (Figure S2, Supporting information). Moreover, the Gibson–Ashby model of two types of gyroid structures is also established, as shown in Figure 1f.…”

Section: Resultsmentioning

confidence: 99%

A Novel Ultra‐Wideband Electromagnetic‐Wave‐Absorbing Metastructure Inspired by Bionic Gyroid Structures

Liao

et al. 2023

Advanced Materials

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Traditional honeycomb‐like structural electromagnetic (EM)‐wave‐absorbing materials have been widely used in various equipment as multifunctional materials. However, current EM‐wave‐absorbing materials are limited by narrow absorption bandwidths and incidence angles because of their anisotropic structural morphology. The work presented here proposes a novel EM‐wave‐absorbing metastructure with an isotropic morphology inspired by the gyroid microstructures seen in Parides sesostris butterfly wings. A matching redesign methodology between the material and subwavelength scale properties of the gyroid microstructure is proposed, inspired by the interaction mechanism between the microstructure and the material properties on the EM‐wave‐absorption performance of the prepared metastructure. The bioinspired metastructure is fabricated by additive manufacturing (AM) and subsequent coating through dipping processes, filled with dielectric lossy materials. Based on simulations and experiments, the metastructure designed in this work exhibits an ultrawide absorption bandwidth covering the frequency range of 2–40 GHz with a fractional bandwidth of 180% at normal incidence. Moreover, the metastructure has a stable frequency response when the incident angle is 60° under transverse electric (TE) and transverse magnetic (TM) polarization. Finally, the synergistic mechanism between the microstructure and the material is elucidated, which provides a new paradigm for the design of novel ultra‐broadband EM‐absorbing materials.

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“…Other potential areas of future studies include active configurations, [ 36 ] which in the context of shell‐based materials may enable the time reconfiguration and activation of topological interfaces by inducing geometrical changes, primarily in the form of curvature. Moreover, multifunctional performance [ 37 ] might be pursued by combining mechanical strength, with dynamic wave control and possibly acoustic functionalities.…”

Section: Discussionmentioning

confidence: 99%

Minimal Surface‐Based Materials for Topological Elastic Wave Guiding

Guo

Rosa

Gupta

et al. 2022

Adv Funct Materials

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Materials based on minimal surface geometries have shown superior strength and stiffness at low densities, which makes them promising continuous-based material platforms for a variety of engineering applications. In this work, it is demonstrated how these mechanical properties can be complemented by dynamic functionalities resulting from robust topological guiding of elastic waves at interfaces that are incorporated into the considered material platforms. Starting from the definition of Schwarz P minimal surface, geometric parametrizations are introduced that break spatial symmetry by forming 1D dimerized and 2D hexagonal minimal surface-based materials. Breaking of spatial symmetries produces topologically non-trivial interfaces that support the localization of vibrational modes and the robust propagation of elastic waves along pre-defined paths. These dynamic properties are predicted through numerical simulations and are illustrated by performing vibration and wave propagation experiments on additively manufactured samples. The introduction of symmetry-breaking topological interfaces through parametrizations that modify the geometry of periodic minimal surfaces suggests a new strategy to supplement the load-bearing properties of this class of materials with novel dynamic functionalities.

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Metamaterial Design: Decoupling Minimal Surface Metamaterial Properties Through Multi‐Material Hyperbolic Tilings (Adv. Funct. Mater. 30/2021)

Cited by 6 publications

References 0 publications

Volumetric Bioprinting of Organoids and Optically Tuned Hydrogels to Build Liver‐Like Metabolic Biofactories

Volumetric Bioprinting of Organoids and Optically Tuned Hydrogels to Build Liver‐Like Metabolic Biofactories

A Novel Ultra‐Wideband Electromagnetic‐Wave‐Absorbing Metastructure Inspired by Bionic Gyroid Structures

Minimal Surface‐Based Materials for Topological Elastic Wave Guiding

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