keyword
https://read.qxmd.com/read/38536903/restoration-of-motor-function-using-magnetoelectric-metamaterials
#1
JOURNAL ARTICLE
Amos Matsiko
Implantable magnetic materials can be used for wireless neural stimulation and restoration of motor function.
March 27, 2024: Science Robotics
https://read.qxmd.com/read/38536751/elasticity-and-rheology-of-auxetic-granular-metamaterials
#2
JOURNAL ARTICLE
Daan Haver, Daniel Acuña, Shahram Janbaz, Edan Lerner, Gustavo Düring, Corentin Coulais
The flowing, jamming, and avalanche behavior of granular materials is satisfyingly universal and vexingly hard to tune: A granular flow is typically intermittent and will irremediably jam if too confined. Here, we show that granular metamaterials made from particles with a negative Poisson's ratio yield more easily and flow more smoothly than ordinary granular materials. We first create a collection of auxetic grains based on a re-entrant mechanism and show that each grain exhibits a negative Poisson's ratio regardless of the direction of compression...
April 2, 2024: Proceedings of the National Academy of Sciences of the United States of America
https://read.qxmd.com/read/38533978/plasma-driven-tuning-of-dielectric-permittivity-in-graphene
#3
JOURNAL ARTICLE
Elena Tatarova, Ana Dias, Plamen Dankov, Jivko Kissovski, Ana Maria Botelho do Rego, Neli Bundaleska, Edgar Felizardo, Miroslav Abrashev, Ana Maria Ferraria, Thomas Strunskus, Vasyl Shvalya, Neelakandan M Santhosh, Ivan Valeriev Ivanov, Martin Košiček, Janez Zavašnik, Luis Lemos Alves, Bruno Gonçalves, Uroš Cvelbar
Materials with tunable negative electromagnetic performance, i.e., where dielectric permittivity becomes negative, have long been pursued in materials research due to their peculiar electromagnetic (EM) characteristics. Here, this promising feature is reported in materials on the case of plasma-synthesized nitrogen-doped graphene sheets with tunable permittivity over a wide (1-40 GHz) frequency range. Selectively incorporated nitrogen atoms in a graphene scaffold tailor the electronic structure in a way that provides an ultra-low energy (0...
March 27, 2024: Small
https://read.qxmd.com/read/38528038/direct-observation-of-phase-transitions-in-truncated-tetrahedral-microparticles-under-quasi-2d-confinement
#4
JOURNAL ARTICLE
David Doan, John Kulikowski, X Wendy Gu
Colloidal crystals are used to understand fundamentals of atomic rearrangements in condensed matter and build complex metamaterials with unique functionalities. Simulations predict a multitude of self-assembled crystal structures from anisotropic colloids, but these shapes have been challenging to fabricate. Here, we use two-photon lithography to fabricate Archimedean truncated tetrahedrons and self-assemble them under quasi-2D confinement. These particles self-assemble into a hexagonal phase under an in-plane gravitational potential...
March 25, 2024: Nature Communications
https://read.qxmd.com/read/38523749/demonstration-and-control-of-spoof-plasmon-scattering-from-3d-spherical-metaparticles
#5
JOURNAL ARTICLE
Alexander W Powell, Thomas E Whittaker, William G Whittow, J Roy Sambles, Alastair P Hibbins
Geometries that replicate the behavior of metal nanostructures at much lower frequencies via texturing surfaces so they will support a surface wave have been a central pillar of metamaterials research. However, previous work has focused largely on geometries that can be reduced to symmetries in one or two dimensions, such as strips, flat planes, and cylinders. Shapes with isotropic responses in three dimensions are important for applications, such as radar scattering and the replication of certain nanoscale behaviors...
March 20, 2024: ACS Photonics
https://read.qxmd.com/read/38521784/programming-mechanics-in-knitted-materials-stitch-by-stitch
#6
JOURNAL ARTICLE
Krishma Singal, Michael S Dimitriyev, Sarah E Gonzalez, A Patrick Cachine, Sam Quinn, Elisabetta A Matsumoto
Knitting turns yarn, a 1D material, into a 2D fabric that is flexible, durable, and can be patterned to adopt a wide range of 3D geometries. Like other mechanical metamaterials, the elasticity of knitted fabrics is an emergent property of the local stitch topology and pattern that cannot solely be attributed to the yarn itself. Thus, knitting can be viewed as an additive manufacturing technique that allows for stitch-by-stitch programming of elastic properties and has applications in many fields ranging from soft robotics and wearable electronics to engineered tissue and architected materials...
March 23, 2024: Nature Communications
https://read.qxmd.com/read/38521781/amber-rainbow-ribbon-effect-in-broadband-optical-metamaterials
#7
JOURNAL ARTICLE
Jing Zhao, Xianfeng Wu, Doudou Zhang, Xiaoting Xu, Xiaonong Wang, Xiaopeng Zhao
Using the trapped rainbow effect to slow down or even stop light has been widely studied. However, high loss and energy leakage severely limited the development of rainbow devices. Here, we observed the negative Goos-Hänchen effect in film samples across the entire visible spectrum. We also discovered an amber rainbow ribbon and an optical black hole due to perfect back reflection in optical waveguides, where little light leaks out. Not only does the amber rainbow ribbon effect show an automatic frequency selection response, as predicted by single frequency theoretical models and confirmed by experiments, it also shows spatial periodic regulation, resulting from broadband omnidirectional visible metamaterials prepared by disordered assembly systems...
March 23, 2024: Nature Communications
https://read.qxmd.com/read/38518512/nacre-like-block-lattice-metamaterials-with-targeted-phononic-band-gap-and-mechanical-properties
#8
JOURNAL ARTICLE
Ravi Kiran Bollineni, Moustafa Sayed Ahmed, Shima Shahab, Reza Mirzaeifar
The extraordinary quasi-static mechanical properties of nacre-like composite metamaterials, such as high specific strength, stiffness, and toughness, are due to the periodic arrangement of two distinct phases in a "brick and mortar" structure. It is also theorized that the hierarchical periodic structure of nacre structures can provide wider band gaps at different frequency scales. However, the function of hierarchy in the dynamic behavior of metamaterials is largely unknown, and most current investigations are focused on a single objective and specialized applications...
March 18, 2024: Journal of the Mechanical Behavior of Biomedical Materials
https://read.qxmd.com/read/38518354/curved-crease-origami-for-morphing-metamaterials
#9
JOURNAL ARTICLE
Asma Karami, Adam Reddy, Hussein Nassar
We find a closed-form expression for the Poisson's coefficient of curved-crease variants of the "Miura ori" origami tessellation. This is done by explicitly constructing a continuous one-parameter family of isometric piecewise-smooth surfaces that describes the action of folding out of a reference state. The response of the tessellations in bending is investigated as well: using a numerical convergence scheme, the effective normal curvatures under infinitesimal bending are found to occur in a ratio equal and opposite to the Poisson's coefficient...
March 8, 2024: Physical Review Letters
https://read.qxmd.com/read/38513234/multi-scale-dispersion-engineering-on-biomass-derived-materials-for-ultra-wideband-and-wide-angle-microwave-absorption
#10
JOURNAL ARTICLE
Ruiyang Tan, Yijie Liu, Weijin Li, Jintang Zhou, Ping Chen, Ali Zavabeti, Haibo Zeng, Zhengjun Yao
Efficient electromagnetic waves (EMWs) absorbing materials play a vital role in the electronic era. In traditional research on microwave absorbing (MA) materials, the synergistic modulation of material dispersion and structural dispersion of EMWs by incorporating multi-scale effects has frequently been overlooked, resulting in an untapped absorption potential. In this study, the material dispersion customization method based on biomass carbon is determined by quantitative analysis. The study carries out thermodynamic modulation of carbon skeleton, micro-nano porous engineering, and phosphorus atom donor doping in turn...
March 21, 2024: Small Methods
https://read.qxmd.com/read/38511282/a-dual-functional-tunable-terahertz-metamaterial-absorber-based-on-vanadium-dioxide
#11
JOURNAL ARTICLE
Junhao Niu, Qiang Hui, Wei Mo, Qianyu Yao, Haozhuo Gong, Renfang Tian, Aijun Zhu
A dual-functional switchable metamaterial absorber (MMA) based on vanadium dioxide (VO2 ), which achieves flexible switching between broadband absorption and four-band absorption by adjusting the VO2 conductivity, was proposed. The device has a broadband absorption function when VO2 is in the metal phase, and the conductivity is 3 × 105 S m-1 . Numerical simulation shows that the absorption rate of the device reaches over 90% in the frequency range of 3.36-6.98 THz. The absorber exhibits polarization insensitivity and wide-angle absorption to transverse electric (TE) and transverse magnetic (TM) waves...
March 21, 2024: Physical Chemistry Chemical Physics: PCCP
https://read.qxmd.com/read/38510045/a-metamaterial-unit-cell-based-patch-radiator-for-brain-machine-interface-technology
#12
JOURNAL ARTICLE
Emtiaz Ahmed Mainul, Md Faruque Hossain
This paper presents a novel approach to the design of a brain implantable antenna tailored for brain-machine interface (BMI) technology. The design is based on a U-shaped unit-cell metamaterial (MTM), introducing innovative features to enhance performance and address specific challenges associated with BMI applications. The motivation behind the use of the unit-cell structure is to elongate the electric path within the antenna patch, diverging from a reliance on the electrical properties of the MTM. Consequently, the unit cell is connected to an inset-fed transmission line and shorted to the ground...
March 30, 2024: Heliyon
https://read.qxmd.com/read/38509280/non-reciprocal-topological-solitons-in-active-metamaterials
#13
JOURNAL ARTICLE
Jonas Veenstra, Oleksandr Gamayun, Xiaofei Guo, Anahita Sarvi, Chris Ventura Meinersen, Corentin Coulais
From protein motifs1 to black holes2 , topological solitons are pervasive nonlinear excitations that are robust and can be driven by external fields3 . So far, existing driving mechanisms all accelerate solitons and antisolitons in opposite directions3,4 . Here we introduce a local driving mechanism for solitons that accelerates both solitons and antisolitons in the same direction instead: non-reciprocal driving. To realize this mechanism, we construct an active mechanical metamaterial consisting of non-reciprocally coupled oscillators5-8 subject to a bistable potential9-14 ...
March 2024: Nature
https://read.qxmd.com/read/38507996/anisotropic-plates-with-architected-tendon-network
#14
JOURNAL ARTICLE
Md Shahjahan Hossain, Hossein Ebrahimi, Ranajay Ghosh
We synthesize geometrically tailorable anisotropic plates by combining button shaped fish-scale like features on soft substrates, then lacing them with high-stiffness strings. This creates a new type of biomimetic architectured structure with multiple broken symmetries. First, the tendons and substrate together break the symmetry of the bending response between the concave and convex curvature. Next, the weave pattern of the tendons further breaks symmetry along the two directors of plates. The anisotropy is clearly evident in 3-point bending experiments...
March 15, 2024: Journal of the Mechanical Behavior of Biomedical Materials
https://read.qxmd.com/read/38503653/observation-of-non-hermitian-skin-effect-in-thermal-diffusion
#15
JOURNAL ARTICLE
Yun-Kai Liu, Pei-Chao Cao, Minghong Qi, Qiang-Kai-Lai Huang, Feng Gao, Yu-Gui Peng, Ying Li, Xue-Feng Zhu
The paradigm shift of Hermitian systems into the non-Hermitian regime profoundly modifies inherent property of the topological systems, leading to various unprecedented effects such as the non-Hermitian skin effect (NHSE). In the past decade, the NHSE has been demonstrated in quantum, optical and acoustic systems. Beside those wave systems, the NHSE in diffusive systems has not yet been observed, despite recent abundant advances in the study of topological thermal diffusion. In this work, we design a thermal diffusion lattice based on a modified Su-Schrieffer-Heeger model and demonstrate the diffusive NHSE...
March 2, 2024: Science Bulletin
https://read.qxmd.com/read/38502409/spin-controlled-topological-phase-transition-in-non-euclidean-space
#16
JOURNAL ARTICLE
Zhuochen Du, Jinze Gao, Qiuchen Yan, Cuicui Lu, Xiaoyong Hu, Qihuang Gong
Modulation of topological phase transition has been pursued by researchers in both condensed matter and optics research fields, and has been realized in Euclidean systems, such as topological photonic crystals, topological metamaterials, and coupled resonator arrays. However, the spin-controlled topological phase transition in non-Euclidean space has not yet been explored. Here, we propose a non-Euclidean configuration based on Möbius rings, and we demonstrate the spin-controlled transition between the topological edge state and the bulk state...
March 19, 2024: Front Optoelectron
https://read.qxmd.com/read/38498706/phototransformation-of-achiral-metasurfaces-into-handedness-selectable-transient-chiral-media
#17
JOURNAL ARTICLE
Andrew S Kim, Anjan Goswami, Mohammad Taghinejad, Wenshan Cai
Chirality is a geometric property describing the lack of mirror symmetry. This unique feature enables photonic spin-selectivity in light-matter interaction, which is of great significance in stereochemistry, drug development, quantum optics, and optical polarization control. The versatile control of optical geometry renders optical metamaterials as an effective platform for engineered chiral properties at prescribed spectral regimes. Unfortunately, geometry-imposed restrictions only allow one circular polarization state of photons to effectively interact with chiral meta-structures...
March 26, 2024: Proceedings of the National Academy of Sciences of the United States of America
https://read.qxmd.com/read/38497803/titanium-nitride-based-hyperbolic-metamaterial-for-near-infrared-ultrasensitive-sensing-of-microbes
#18
JOURNAL ARTICLE
Dip Sarker, Ahmed Zubair
We demonstrate an ultrasensitive microbe sensor for the first time using a titanium nitride (TiN) nanowire-based hyperbolic metamaterial (HMM) structure. We detected the change in the resonance wavelength shift due to the inclusion of microbes in a freshwater environment employing the finite-difference time-domain (FDTD) method. Our proposed HMM sensor exhibits strong bulk plasmon polariton (BPP) modes in the anisotropic hyperbolic regime ( λ ≥ 590 nm) and operates in the near-infrared (NIR) wavelength region...
March 18, 2024: Physical Chemistry Chemical Physics: PCCP
https://read.qxmd.com/read/38496041/in-situ-engineering-of-conducting-polymer-nanocomposites-at-liquid-liquid-interfaces-a-perspective-on-fundamentals-to-technological-significance
#19
REVIEW
Mini Mol Menamparambath
The conducting polymers have continuously been hybridized with their counterparts to overcome the intrinsic functional limitations compared to the metallic or inorganic analogs. Remarkably, the liquid/liquid interface-assisted methods represent an efficient and facile route for developing fully tunable metamaterials for various applications. The spontaneous adsorption of nanostructures at a quasi-two-dimensional interface is energetically favorable due to the reduction in interfacial tension, interfacial area, and interfacial energy (Helmholtz free energy)...
March 13, 2024: ACS Mater Au
https://read.qxmd.com/read/38492502/dynamic-topology-optimization-of-3d-printed-transtibial-orthopedic-implant-using-tunable-isotropic-porous-metamaterials
#20
JOURNAL ARTICLE
Josué García-Ávila, Cynthia Pamela González-Gallegos, Victor Segura-Ibarra, Elisa Vazquez, Erika Garcia-Lopez, Ciro A Rodríguez, Adriana Vargas-Martínez, Enrique Cuan-Urquizo, Erick Ramírez-Cedillo
In this paper, we introduce the design and manufacturing process of a transtibial orthopedic implant. We used medical-grade polyurethane polymer resin to fabricate a 3D porous architected implant with tunable isotropy, employing a high-speed printing method known as Continuous Liquid Interface Production (CLIP). Our objective is to enhance the weight-bearing capabilities of the bone structures in the residual limb, thereby circumventing the traditional reliance on a natural bridge. To achieve a custom-made design, we acquire the topology and morphology of the residual limb as well as the bone structure of the tibia and fibula, utilizing computed tomography (CT) and high-resolution 3D scanning...
March 2, 2024: Journal of the Mechanical Behavior of Biomedical Materials
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