Fabrication and deformation of three-dimensional hollow ceramic nanostructures

Jang, Dongchan; Meza, Lucas R.; Greer, Frank; Greer, Julia R.

doi:10.1038/nmat3738

Cited by 451 publications

(344 citation statements)

References 29 publications

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“…A photonic LHM requires simultaneously negative dielectric permittivity ( ) and magnetic permeability (μ). Plasmon resonances in metals give rise to a frequency-dependent dielectric permittivity which has a similar functional form as Equation (1). Below the plasmon frequency is negative, however, at very low frequencies the effect of the plasmon is destroyed by dissipation.…”

Section: Emergence Of Negative and Tensorial Materials Propertiesmentioning

confidence: 98%

“…These properties can be electronic, magnetic, acoustic, or elastic and have, of late, come to include static [1] properties. In the context of acoustic metamaterials, these properties refer to the bulk modulus and density, and for elastic metamaterials, they refer to the moduli (bulk, shear, and anisotropic) and density of a designed composite material.…”

Section: Introductionmentioning

confidence: 99%

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Elastic metamaterials and dynamic homogenization: a review

Srivastava

2015

International Journal of Smart and Nano Materials

122

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In this paper, we review the recent advances which have taken place in the understanding and applications of acoustic/elastic metamaterials. Metamaterials are artificially created composite materials which exhibit unusual properties that are not found in nature. We begin with presenting arguments from discrete systems which support the case for the existence of unusual material properties such as tensorial and/or negative density. The arguments are then extended to elastic continuums through coherent averaging principles. The resulting coupled and nonlocal homogenized relations, called the Willis relations, are presented as the natural description of inhomogeneous elastodynamics. They are specialized to Bloch waves propagating in periodic composites and we show that the Willis properties display the unusual behavior which is often required in metamaterial applications such as the Veselago lens. We finally present the recent advances in the area of transformation elastodynamics, charting its inspirations from transformation optics, clarifying its particular challenges, and identifying its connection with the constitutive relations of the Willis and the Cosserat types.

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Section: Emergence Of Negative and Tensorial Materials Propertiesmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Elastic metamaterials and dynamic homogenization: a review

Srivastava

2015

International Journal of Smart and Nano Materials

122

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“…Failure in such structural materials is always initiated at the weakest connection, which is determined by the competing effects of stress concentrators at surface imperfections and local stresses within the microstructure landscape. [13] It is noted that a plateau stress can be clearly observed in polymer nanolattice, whereas a brittle-like behavior exists in composite nanolattices in which the failure of the structure with HEA film results in a drop in the stress-strain curve. This is due to the dominating buckling and brittle fracture mechanism for the bare polymeric nanolattice and composite nanolattices, respectively, as shown in Movie S1 and S2 in the supporting information.…”

Section: Hea Filmmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9] The strength of lattices is determined not only by the order and periodicity of its structure, but also by the constituent materials. [10,11] Recently, numerous engineering materials such as Al 2 O 3, [12][13][14] Ni-P alloy, [4,15] glassy carbon, [16] copper, [17] gold, [18] and metallic glass [19,20] have been employed as constituent materials to significantly enhance the mechanical properties of pristine polymer scaffolds with respect to its strength and stiffness. Nevertheless, exploring a kind of lightweight, low-cost, and easily fabricated material with promising mechanical features that are easily to be coupled with pristine lattice structure is still a challenge.…”

Section: Introductionmentioning

confidence: 99%

High‐Entropy Alloy (HEA)‐Coated Nanolattice Structures and Their Mechanical Properties

et al. 2017

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Nanolattice structure fabricated by two-photon lithography (TPL) is a coupling of size-dependent mechanical properties at micro/nano-scale with structural geometry responses in wide applications of scalable micro/nano-manufacturing. In this work, three-dimensional (3D) polymeric nanolattices are initially fabricated using TPL, then conformably coated with an 80 nm thick high-entropy alloy (HEA) thin film (CoCrFeNiAl 0.3 ) via physical vapor deposition (PVD). 3D atomic-probe tomography (APT) reveals the homogeneous element distribution in the synthesized HEA film deposited on the substrate. Mechanical properties of the obtained composite architectures are investigated via in situ scanning electron microscope (SEM) compression test, as well as finite element method (FEM) at the relevant length scales. The presented HEA-coated nanolattice encouragingly not only exhibits superior compressive specific strength of %0.032 MPa kg À1 m 3 with density well below 1000 kg m À3 , but also shows good compression ductility due to its composite nature. This concept of combining HEA with polymer lattice structures demonstrates the potential of fabricating novel architected metamaterials with tunable mechanical properties.

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“…The versatility of current fabrication methods and processing techniques engenders a virtually unbounded potential design space by which new materials can be created [8][9][10][11][12][13][14][15][16][17]. Despite many proof-of-concept demonstrations, very few guiding principles exist for designing architectures that efficiently integrate structural and microstructural deformation mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Reexamining the mechanical property space of three-dimensional lattice architectures

et al. 2017

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Lightweight materials that are simultaneously strong and stiff are desirable for a range of applications from transportation to energy storage to defense. Micro-and nanolattices represent some of the lightest fabricated materials to date, but studies of their mechanical properties have produced inconsistent results that are not well captured by existing lattice models. We performed systematic nanomechanical experiments on four distinct geometries of solid polymer and hollow ceramic (Al 2 O 3 ) nanolattices. All samples tested had a nearly identical scaling of strength (ߪ ௬ ) and Young's modulus ‫)ܧ(‬ with relative density (ߩ̅ ), ranging from ߪ ௬ ∝ ߩ̅ ଵ.ସହ to ߩ̅ ଵ.ଽଶ and ‫ܧ‬ ∝ ߩ̅ ଵ.ସଵ to ߩ̅ ଵ.଼ଷ , revealing that changing topology alone does not necessarily have a significant impact on nanolattice mechanical properties. Finite element analysis was performed on solid and hollow lattices with structural parameters beyond those realized experimentally, enabling the identification of transition regimes where solid-beam lattices diverge from existing analytical theories and revealing the complex parameter space of hollow-beam lattices. We propose a simplified analytical model for solid-beam lattices that provides insight into the mechanisms behind their observed stiffness, and we investigate different hollow-beam lattice parameters that give rise to their aberrant properties. These experimental, computational and theoretical results uncover how architecture can be used to access unique lattice mechanical property spaces while demonstrating the practical limits of existing beam-based models in characterizing their behavior.

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Fabrication and deformation of three-dimensional hollow ceramic nanostructures

Cited by 451 publications

References 29 publications

Elastic metamaterials and dynamic homogenization: a review

Elastic metamaterials and dynamic homogenization: a review

High‐Entropy Alloy (HEA)‐Coated Nanolattice Structures and Their Mechanical Properties

Reexamining the mechanical property space of three-dimensional lattice architectures

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