Origami Metamaterials for Tunable Thermal Expansion

Boatti, Elisa; Vasios, Nikolaos; Bertoldi, Katia

doi:10.1002/adma.201700360

Cited by 194 publications

(105 citation statements)

References 30 publications

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“…It is worth highlighting that besides the aformentioned mechanical properties, the architected origami materials have also shown protentials in reconfigurable electromagnetic and thermo applications, however, discussion on these topics are beyond the scope of this paper.…”

Section: Folding Induced Mechanical Propertiesmentioning

confidence: 99%

Architected Origami Materials: How Folding Creates Sophisticated Mechanical Properties

et al. 2018

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devices, [26,27] to small-scale nano- [28][29][30] and DNA origamis. [31] A common theme in these studies is to exploit the sophisticated shape transformations from folding. For example, an origami robot is typically fabricated in a 2D flat configuration and then folded into the prescribed 3D shape to perform its tasks. The origamis have been treated essentially as linkage mechanisms in which rigid facets rotate around hingelike creases (aka "rigid-folding origami"). Elastic deformation of the constituent sheet materials or the dynamics of folding are often neglected. Such a limitation in scope indeed resonates the origin of this field, that is, folding was initially considered as a topic in geometry and kinematics.However, the increasingly diverse applications of origami require us to understand the force-deformation relationship and other mechanical properties of folded structures. Over the last decade, studies in this field started to expand beyond design and kinematics and into the domain of mechanics and dynamics. Catalyzed by this development, a family of architected origami materials quickly emerged (Figure 1). These materials are essentially assemblies of origami sheets or modules with carefully designed crease patterns. The kinematics of folding still plays an important role in creating certain properties of these origami materials. For example, rigid folding of the classical Miura-ori sheet induces an in-plane deformation pattern with auxetic properties (aka negative Poisson's ratios). [32,33] However, elastic energy in the deformed facets and creases, combined with their intricate spatial distributions, impart the origami materials with a rich list of desirable and even unorthodox properties that were never examined in origami before. For example, the Ron-Resch fold creates a unique tri-fold structure where pairs of triangular facets are oriented vertically to the overall origami sheet and pressed against each other. Such an arrangement can effectively resist buckling and create very high compressive load bearing capacity. [34] Other achieved properties include shape-reconfiguration, tunable nonlinear stiffness and dynamic characteristics, multistability, and impact absorption.Since the architected origami materials obtain their unique properties from the 3D geometries of the constituent sheets or modules, they can be considered a subset of architected cellular solids or mechanical metamaterials. [35][36][37][38][39] However, the origami materials have many unique characteristics. The rich geometries of origami offer us great freedom to tailor targeted Origami, the ancient Japanese art of paper folding, is not only an inspiring technique to create sophisticated shapes, but also a surprisingly powerful method to induce nonlinear mechanical properties. Over the last decade, advances in crease design, mechanics modeling, and scalable fabrication have fostered the rapid emergence of architected origami materials. These materials typically consist of folded origami sheets or modules with intricate 3D geomet...

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Section: Folding Induced Mechanical Propertiesmentioning

confidence: 99%

Architected Origami Materials: How Folding Creates Sophisticated Mechanical Properties

et al. 2018

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“…There exists a variation of origami called kirigami, which involves both cutting and folding. Origami and kirigami based design principles have recently attracted a growing amount of interest from the scientific and engineering communities, and have enabled a wide variety of promising applications such as self-assembling robots, reconfigurable mechanical metamaterials, self-deployable heart stents, dynamic solar tracking, flexible lithium-ion batteries, and soft actuators [145][146][147][148][149][150][151][152] . Even, at biological level, the invention of DNA origami has deepened the understanding of how molecules could interact with each other in a complex self-assembly process and has accelerated the engineering of molecular systems with custom-designed structures and programmable behaviors [153][154][155][156][157][158][159] .…”

Section: Concept Of Surface Energymentioning

confidence: 99%

Reading at exposed surfaces: theoretical insights into photocatalytic activity of ZnWO4

et al. 2018

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Understanding the criteria warranting the existence, stability, and activity of a given configuration of atoms has pivotal relevance in chemical and materials science. Photocatalysts, traditionally semiconductors, are essential for processes ranging from water purification to water splitting, air filtration, and surgical instrument sterilization, and harvest optical energy to drive chemical reactions. These semiconductors harvest optical energy to drive chemical reactions. With chemical reactions dictated by atomic and molecular interactions at the nanoscale, examining these processes with near-atomic resolution is necessary to understand photochemical processes in depth and to improve materials for next-generation catalysts. The performance and key electronic properties of semiconductors are dictated by the interplay between the surface chemistry and morphology, whose manipulation has inspired experimental and theoretical researchers. This interplay has been clarified by theoretical studies based on atomic-scale modelling with particular attention given to two sets of degreesof-freedom: the atomic positions and chemical configuration. This perspective article presents the major computational challenges and modern methodological strategies toward advancing the field. The ZnWO 4 material was selected as a case study, and the key concepts developed in recent years are discussed to clarify the morphology, i.e., the exposed surfaces of materials, and explain its functional properties or performance. First-principle calculations capture the geometric and electronic effects on the photocatalytic activity in agreement with experimental data. Indeed, important and often surprising structure-function relations have been observed based in depth atomistic modelling on morphological analysis. An overview of past achievements and future directions is provided according to the authors' outlook.

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“…Origami assembly can also realize important basic architectural elements in mechanical metamaterials with other unusual properties, such as negative Poisson's ratio, [23,48,53] bistability, [54] self-locking, [55] and controllable thermal expansion. [56] Kirigami provides an alternative approach to mechanical metamaterials. The bottom panel of Figure 1a shows examples formed by kirigami with orthogonal cuts.…”

Section: Introductionmentioning

confidence: 99%

Assembly of Advanced Materials into 3D Functional Structures by Methods Inspired by Origami and Kirigami: A Review

Ning

Wang

Zhang

et al. 2018

Adv Materials Inter

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expand the range of accessible 3D geometries. [5-8] Due to their shape-adaptive nature, origami and kirigami, originally applied only to paper, can serve as routes to large-scale structural systems that require packaging and deployment, such as foldable solar panels, [9,10] retractable roofs, [11] deployable sunshields, [12] and many others. [13] More recent work demonstrates that these and related methods for assembling planar materials into complex 3D structures can exploit sophisticated 2D fabrication technologies and thin film materials from the electronics/optoelectronics industries, to yield functional systems in 3D designs that were previously unachievable. [14-18] In this way, the techniques of origami/kirigami can enable many classes of nontraditional devices not only at the macroscale but also at the micro/ nanoscale, with the potential to open up opportunities for unusual engineering designs in microsystems technologies. [19-22] Much research in origami/kirigami assembly aims to extend the range of length scales and the scope of functional materials that can be realized in 3D systems, and to transfer those ideas and Origami and kirigami, the ancient techniques for making paper works of art, also provide inspiration for routes to structural platforms in engineering applications, including foldable solar panels, retractable roofs, deployable sunshields, and many others. Recent work demonstrates the utility of the methods of origami/kirigami and conceptually related schemes in cutting, folding, and buckling in the construction of devices for emerging classes of technologies, with examples in mechanical/optical metamaterials, stretchable/ conformable electronics, micro/nanoscale biosensors, and large-amplitude actuators. Specific notable progress is in the deployment of functional materials such as single-crystal silicon, shape memory polymers, energy-storage materials, and graphene into elaborate 3D micro and nanoscale architectures. This review highlights some of the most important developments in this field, with a focus on routes to assembly that apply across a range of length scales and with advanced materials of relevance to practical applications. Hall of Fame Article The ORCID identification number(s) for the author(s) of this article can be found under

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Origami Metamaterials for Tunable Thermal Expansion

Cited by 194 publications

References 30 publications

Architected Origami Materials: How Folding Creates Sophisticated Mechanical Properties

Architected Origami Materials: How Folding Creates Sophisticated Mechanical Properties

Reading at exposed surfaces: theoretical insights into photocatalytic activity of ZnWO4

Assembly of Advanced Materials into 3D Functional Structures by Methods Inspired by Origami and Kirigami: A Review

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