Metamaterials: Origami Metamaterials for Tunable Thermal Expansion (Adv. Mater. 26/2017)

Boatti, Elisa; Vasios, Nikolaos; Bertoldi, Katia

doi:10.1002/adma.201770184

Cited by 8 publications

(5 citation statements)

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“…Such architectures support essential functions in both plant and animal life, such as flower stamens and petals for pollination, gecko's feet for controlled adhesion, and shark scales for drag reduction. These and other examples of 3D systems in living organisms also provide inspiration for engineered counterparts in electronics, [1][2][3][4][5] photonics, [6][7][8][9] biosensing, [10][11][12][13] energy storage systems, [14][15][16][17] mechanical and optical metamaterials, [18][19][20][21][22][23] microrobotics, [24][25][26][27][28][29] and other areas. Schemes for fabricating such structures focus on direct top-down or bottom-up techniques.…”

Section: Introductionmentioning

confidence: 95%

Mechanically Guided Hierarchical Assembly of 3D Mesostructures

Zhao

et al. 2022

Advanced Materials

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Abstract3D, hierarchical micro/nanostructures formed with advanced functional materials are of growing interest due to their broad potential utility in electronics, robotics, battery technology, and biomedical engineering. Among various strategies in 3D micro/nanofabrication, a set of methods based on compressive buckling offers wide‐ranging material compatibility, fabrication scalability, and precise process control. Previously reports on this type of approach rely on a single, planar prestretched elastomeric platform to transform thin‐film precursors with 2D layouts into 3D architectures. The simple planar configuration of bonding sites between these precursors and their assembly substrates prevents the realization of certain types of complex 3D geometries. In this paper, a set of hierarchical assembly concepts is reported that leverage multiple layers of prestretched elastomeric substrates to induce not only compressive buckling of 2D precursors bonded to them but also of themselves, thereby creating 3D mesostructures mounted at multiple levels of 3D frameworks with complex, elaborate configurations. Control over strains used in these processes provides reversible access to multiple different 3D layouts in a given structure. Examples to demonstrate these ideas through both experimental and computational results span vertically aligned helices to closed 3D cages, selected for their relevance to 3D conformal bio‐interfaces and multifunctional microsystems.

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Section: Introductionmentioning

confidence: 95%

Mechanically Guided Hierarchical Assembly of 3D Mesostructures

Zhao

et al. 2022

Advanced Materials

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“…In the study of materials with excellent properties, architected materials, which exhibit unique behavior owing to their geometry rather than composition, have made significant advances in recent years. [ 1 , 2 , 3 ] By rationally engineered material geometries, many exceptional properties, including ultrahigh ratio of stiffness‐weight and strength‐weight, [ 4 , 5 ] zero or negative Poisson's ratio, [ 6 , 7 ] negative thermal expansion, [ 8 , 9 ] target failure load, [ 10 ] and vanishing shear modulus, [ 11 ] have been demonstrated. Thus, such materials have been suggested for application in intelligent machines, [ 12 , 13 ] shape‐morphing systems, [ 14 , 15 ] switchable optical devices, [ 16 , 17 ] and stretchable electronics.…”

Section: Introductionmentioning

confidence: 99%

Design Criteria for Architected Materials with Programmable Mechanical Properties Within Theoretical Limit Ranges

Yin,

Li,

Hong

et al. 2023

Advanced Science

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Architected materials comprising periodic arrangements of cells have attracted considerable interest in various fields because of their unconventional properties and versatile functionality. Although some better properties may be exhibited when this homogeneous layout is broken, most such studies rely on a fixed material geometry, which limits the design space for material properties. Here, combining heterogeneous and homogeneous assembly of cells to generate tunable geometries, a hierarchically architected material (HAM) capable of significantly enhancing mechanical properties is proposed. Guided by the theoretical model and 745 752 simulation cases, generic design criteria are introduced, including dual screening for unique mechanical properties and careful assembly of specific spatial layouts, to identify the geometry of materials with extreme properties. Such criteria facilitate the potential for unprecedented properties such as Young's modulus at the theoretical limit and tunable positive and negative Poisson's ratios in an ultra‐large range. Therefore, this study opens a new paradigm for materials with extreme mechanical properties.

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“…In the past two decades, metamaterials that disrupt thermal, acoustic, and mechanical fields and that have highly unusual properties, such as wide‐range thermal expansion coefficients, stimuli triggered negative constitutive parameters, and reprogrammable stiffness or dissipation, have been demonstrated ( Scheme a). [ 3 ] Though significant progress has been made in the research of metamaterials, their applicability in certain areas still suffers because of their resistance to size tailoring. For example, despite the efforts that have been demonstrated successful in producing metamaterials with a minimum size of nanometers and maximum size of centimeters or even meters, the applicability of metamaterials falls short in nanomedicine fields which requires a maximum size scale of tens to hundreds of nanometers.…”

Section: Introductionmentioning

confidence: 99%

A Dual‐Kinetic Control Strategy for Designing Nano‐Metamaterials: Novel Class of Metamaterials with Both Characteristic and Whole Sizes of Nanoscale

Wang

et al. 2022

Advanced Science

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Increasingly intricate in their multilevel multiscale microarchitecture, metamaterials with unique physical properties are challenging the inherent constraints of natural materials. Their applicability in the nanomedicine field still suffers because nanomedicine requires a maximum size of tens to hundreds of nanometers; however, this size scale has not been achieved in metamaterials. Therefore, “nano‐metamaterials,” a novel class of metamaterials, are introduced, which are rationally designed materials with multilevel microarchitectures and both characteristic sizes and whole sizes at the nanoscale, investing in themselves remarkably unique and significantly enhanced material properties as compared with conventional nanomaterials. Microarchitectural regulation through conventional thermodynamic strategy is limited since the thermodynamic process relies on the frequency‐dependent effective temperature, Teff(ω), which limits the architectural regulation freedom degree. Here, a novel dual‐kinetic control strategy is designed to fabricate nano‐metamaterials by freezing a high‐free energy state in a Teff(ω)‐constant system, where two independent dynamic processes, non‐solvent induced block copolymer (BCP) self‐assembly and osmotically driven self‐emulsification, are regulated simultaneously. Fe3+‐“onion‐like core@porous corona” (Fe3+‐OCPCs) nanoparticles (the products) have not only architectural complexity, porous corona and an onion‐like core but also compositional complexity, Fe3+ chelating BCP assemblies. Furthermore, by using Fe3+‐OCPCs as a model material, a microstructure‐biological performance relationship is manifested in nano‐metamaterials.

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Metamaterials: Origami Metamaterials for Tunable Thermal Expansion (Adv. Mater. 26/2017)

Cited by 8 publications

References 0 publications

Mechanically Guided Hierarchical Assembly of 3D Mesostructures

Mechanically Guided Hierarchical Assembly of 3D Mesostructures

Design Criteria for Architected Materials with Programmable Mechanical Properties Within Theoretical Limit Ranges

A Dual‐Kinetic Control Strategy for Designing Nano‐Metamaterials: Novel Class of Metamaterials with Both Characteristic and Whole Sizes of Nanoscale

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