Article
Computer Science, Interdisciplinary Applications
Rui Lu, Qiang Luo, Tengfei Wang, Chunfa Zhao
Summary: This study compares the effectiveness and computational efficiency of clumps and rigid blocks in describing actual shapes. Two indices are proposed to quantify surface morphology. The findings show that both models can reasonably characterize irregular surfaces, but improving the accuracy of clumps requires more spherical units, while rigid blocks cannot capture concavity features.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Physics, Applied
Xuewei Liu, Mingyu Duan, Maolin Liu, Fengxian Xin, Chuanzeng Zhang
Summary: The study introduces an acoustic labyrinthine porous metamaterial designed for subwavelength sound absorption by combining the acoustic properties of porous material matrix and folded slit configuration. The experimental results demonstrate excellent subwavelength low-frequency sound absorption performance of the material at low frequencies.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Xingtao Zhao, Yakun Guo, Zekun Jing, Xue Liu, Ruidong Liu, Ran Tao, Tianyu Cai, Yingjun Li, Yuanlin Zhou, Maobing Shuai
Summary: In this study, formable graphene aerogel hydrogen getters were prepared by integrating alkyne-containing molecules into palladium-loaded three-dimensional layered porous graphene aerogel. The results showed that the Pd-GA/DEB composite materials had a high hydrogen absorption capacity in reducing reactive hydrogen gas.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Mingzhi Fan, Zhiying Ren, Zhen Zhang, Yu Yang, Zhiguang Guo
Summary: This paper reports a simple method to prepare durable, low-cost, superhydrophobic, and superlipophilic 3D materials. The successfully prepared superhydrophobic metal rubber, MR-C, effectively separates various water-in-oil emulsions driven by gravity. MR-C, with its stable and efficient separation efficiency and strong mechanical durability, shows great potential in oily wastewater treatment applications.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Gayea Hyun, Shengkai Cao, Youngjin Ham, Doo-Young Youn, Il-Doo Kim, Xiaodong Chen, Seokwoo Jeon
Summary: In this study, a density-graded composite electrode with tailored pore networks was demonstrated to effectively reduce energy loss at high charging rates, thus enhancing the rapid charging capability of lithium-ion batteries.
Article
Chemistry, Physical
Yuhong Cui, Zihao Liu, Yunfei Zhang, Pei Liu, Mudasir Ahmad, Qiuyu Zhang, Baoliang Zhang
Summary: In this study, two-dimensional Ti(3)C(2)Tx MXene nanosheets and one-dimensional Ni nanochains were assembled into three-dimensional porous MXene/Ni composite microspheres using ultrasonic spray, showing excellent electromagnetic wave absorption performance and impedance matching.
Review
Materials Science, Multidisciplinary
Mingrui Han, Yunfei Yang, Wei Liu, Zhihui Zeng, Jiurong Liu
Summary: This article discusses the application of carbon-based electromagnetic wave absorbing materials in solving electromagnetic wave pollution. By designing a three-dimensional porous structure, the absorption effect of the material is improved. The researchers summarize the latest research progress and propose future challenges and prospects.
SCIENCE CHINA-MATERIALS
(2022)
Article
Engineering, Mechanical
Peter L. Varkonyi, Marton Kocsis, Tamas Ther
Summary: Studies on rocking motion focus on explaining the excellent earthquake resistance of rocking structures and propose a new three-dimensional impact model. Experimental measurements of free-rocking blocks on a rigid surface reveal the extreme sensitivity of impacts to geometric imperfections, which may lead to three-dimensional motion.
NONLINEAR DYNAMICS
(2022)
Article
Engineering, Multidisciplinary
Su XiangYu, Pan ZheFei, An Liang
Summary: The Pd-C/NF electrode with a three-dimensional porous structure achieved a higher peak power density in direct formate fuel cells, mainly due to its enhanced mass/ion transport and enlarged electrochemical surface area.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2021)
Article
Thermodynamics
Yang Liu, Yangbo Deng, Junrui Shi, Tingting Yan, Zhenyu Min, Bingquan Ge
Summary: This study uses numerical simulation to investigate the non-equilibrium characteristics of gas velocity and temperature in a two-layer porous media burner, showing that the extent of flow non-equilibrium increases with increasing inlet velocity and equivalence ratio, while gas temperature non-equilibrium decreases slightly with inlet velocity.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Chemistry, Physical
Kunyao Cao, Xin Yang, Yue Zhang, Jiayue Wen, Jun Chen, Xinwang Hou, Rui Zhao, Weidong Xue
Summary: To prepare an electromagnetic wave (EMW) absorption material with excellent properties, ultralight Co-rGO aerogel materials were synthesized through hydrothermal treatment, freeze-drying, and annealing. The addition of pvp and different annealing temperatures were used to investigate the effect of pore structure, pore size, and magnetism on the absorption properties. The Co-MOF microspheres were found to grow onto the rGO nanosheets, as observed by SEM and TEM. The 800Co-rGO-pvp composite exhibited strong absorption and broad effective absorption bandwidth (EAB), covering the Ku band and a quarter of X band, which can be attributed to the magnetic three-dimensional porous structure of Co-rGO aerogel.
Article
Materials Science, Multidisciplinary
Antonio Baldi, Michele Brun, Giorgio Carta
Summary: The proposed design of a novel three-dimensional porous continuous solid with negative Poisson's ratio exhibits cubic symmetry and moderate degree of anisotropy. The directional dependence of Poisson's ratio and Young's modulus shows multidirectional auxeticity. Numerical results are validated by experimental results from Digital Image Correlation data, with potential for large-scale industrial production.
MECHANICS OF MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Zizheng Wang, Hao Jiang, Guangfu Wu, Yi Li, Teng Zhang, Yi Zhang, Xueju Wang
Summary: This study reports a method for programmable three-dimensional microfluidic structures assembled from polydimethylsiloxane (PDMS) and shape-memory polymers (SMPs). The approach allows for the creation of diverse geometries and the ability to program temporary shapes, with well-maintained fluid flow during deformation and shape recovery.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
YuHan Wu, Kangsen Peng, Zengming Man, Rui Zang, Pengxin Li, Shuaishuai Liu, Siyu Wang, Puyu Liu, Peng Li, Yihua Cui
Summary: Hierarchical microstructures play a vital role in the design of high-performance microwave absorption materials. This study presents the synthesis of hierarchically three-dimensional CoNi/nitrogen doped porous carbon nanosheets and demonstrates their impressive microwave absorbing performance.
Article
Chemistry, Physical
Jiaqi Tao, Jintang Zhou, Zhengjun Yao, Zibao Jiao, Bo Wei, Ruiyang Tan, Zhong Li
Summary: The study focused on the micro-morphology design of nanomaterials for improved microwave absorption properties. Results showed that the multi-shell structure enhanced the microwave absorption performance of carbon nanoparticles, with the three-shell structure achieving an effective absorption bandwidth of 5.17 GHz at a thickness of 1.6 mm and a best reflection loss of -18.13 dB.
Article
Materials Science, Multidisciplinary
Bolei Deng, Jian Li, Vincent Tournat, Prashant K. Purohit, Katia Bertoldi
Summary: Recent studies have shown that flexible mechanical metamaterials support a rich nonlinear dynamic response, with the behavior of rotating-square architected systems described by nonlinear Klein-Gordon equations. The researchers found a general class of solutions to these equations, known as cnoidal waves based on Jacobi elliptic functions, which extend from linear waves to solitons and cover a wide family of nonlinear periodic waves. These results unite different concepts of linear and non-linear waves and provide a foundation for extending control strategies for nonlinear elastic waves and vibrations.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Physics, Applied
M. Mallejac, A. Merkel, J. Sanchez-Dehesa, J. Christensen, V. Tournat, V. Romero-Garcia, J. -P. Groby
Summary: This paper investigates the feasibility of cloaking obstacles using Plate-type Acoustic Metamaterials (PAMs) and presents two distinct strategies for achieving hiding configuration. The study focuses on dealing with unavoidable losses in the system and reports on the analytical, numerical, and experimental findings of a hiding zone. The comparison between cloaking and hiding configurations highlights the difference in scattering properties and the impact of obstacles on the hiding device.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Acoustics
Pierric Mora, Mathieu Chekroun, Samuel Raetz, Vincent Tournat
Summary: The article demonstrates theoretically and experimentally the generation of ZGV modes through sum-frequency interaction and explores their potential as local probes in material non-linearity studies. It highlights the resonant nature of ZGV modes, showing their ability to accumulate energy from long excitations and produce detectable effects at extraordinarily low input power levels even in weakly non-linear materials.
Article
Acoustics
E. Perrey-Debain, B. Nennig, J. B. Lawrie
Summary: The study focuses on sound attenuation in a two-dimensional waveguide with arbitrary admittance boundary conditions, with an emphasis on understanding the formation and potential applications of exceptional points (EPs) when two (EP2) or three (EP3) modes degenerate into a single mode. Perturbation approach is used to obtain asymptotic expressions for the trajectories of the axial wavenumbers as they coalesce to form an EP. The numerical results suggest that the first triple root (EP3) ensures maximum modal attenuation along the waveguide, and it is shown that the classical Green's function is degenerate at an EP.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Materials Science, Characterization & Testing
Pierric Mora, Denis Vautrin, Guy d' Urso, Stephane Letourneur, Mathieu Chekroun, Roberto Longo, Vincent Tournat
Summary: This study evaluates the effectiveness of a passive acoustic detection method in detecting gas leaks, demonstrating detection of leak signatures in the 0-20 kHz range. Noise correlation techniques are applied to obtain spectral power densities, maps of amplitudes and beamforming localization which correlate well with the pressure applied inside the building and known leak locations. Detection thresholds of about 500-600 L/h flow rates are reached at up to 4-5 m distance for applied pressures of 4.2 bars during 2 minutes of data accumulation under silent ambient noise conditions.
NDT & E INTERNATIONAL
(2022)
Article
Acoustics
Li-Yang Zheng, Shilin Qu, Florian Allein, Theo Threard, Vitalyi Gusev, Vincent Tournat, Georgios Theocharis
Summary: Granular crystals are a new class of artificial elastic materials with exotic wave transport properties. This study investigates the linear wave dynamics in 1D zigzag granular chains using a spring-mass model, which shows remarkable agreement with experimental measurements. The existence of localized translational-rotational coupled modes at the ends of granular chains is confirmed, suggesting potential applications in advanced elastic wave control scenarios.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Physics, Applied
M. Mallejac, P. Sheng, V Tournat, V Romero-Garcia, J-P Groby
Summary: In this paper, a passive treatment method that considers the time domain and multiple reflections is proposed. A delay line is designed using slow-sound propagation in periodic structures, allowing the reproduction of sound perception over a larger distance. The limitations of real-time pulse propagation, dispersion, and losses on audio fidelity are also discussed.
PHYSICAL REVIEW APPLIED
(2022)
Article
Biology
Ophelie Leger, Frederick Garcia, Mehdi Khafif, Sebastien Carrere, Nathalie Leblanc-Fournier, Aroune Duclos, Vincent Tournat, Eric Badel, Marie Didelon, Aurelie Le Ru, Sylvain Raffaele, Adelin Barbacci
Summary: Mechanical cues from pathogens activate early plant defense in cells distant from the infection site through CMT anisotropic patterning.
Article
Multidisciplinary Sciences
Jane B. Lawrie, B. Nennig, E. Perrey-Debain
Summary: Exceptional points play a crucial role in optimizing attenuation in lined acoustic waveguides. However, analytical modeling of acoustic scattering at these points is not well developed. This article presents an analytic mode-matching approach to accurately model the scattering of sound waves at exceptional points.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2022)
Review
Nanoscience & Nanotechnology
Anastasiia O. Krushynska, Daniel Torrent, Alejandro M. Aragon, Raffaele Ardito, Osama R. Bilal, Bernard Bonello, Federico Bosia, Yi Chen, Johan Christensen, Andrea Colombi, Steven A. Cummer, Bahram Djafari-Rouhani, Fernando Fraternali, Pavel I. Galich, Pedro David Garcia, Jean-Philippe Groby, Sebastien Guenneau, Michael R. Haberman, Mahmoud I. Hussein, Shahram Janbaz, Noe Jimenez, Abdelkrim Khelif, Vincent Laude, Mohammad J. Mirzaali, Pawel Packo, Antonio Palermo, Yan Pennec, Ruben Pico, Maria Rosendo Lopez, Stephan Rudykh, Marc Serra-Garcia, Clivia M. Sotomayor Torres, Timothy A. Starkey, Vincent Tournat, Oliver B. Wright
Summary: This review article provides a summary of recent advances and hot research topics in nanophononics and elastic, acoustic, and mechanical metamaterials based on the authors' presentations at the EUROMECH 610 Colloquium. Unlike a conventional review, it focuses on the state-of-the-art and emerging research directions in these fields rather than historical viewpoints. The article covers basic definitions, design strategies, analysis techniques, and discussions of challenges and applications in each topic, offering valuable insights for early-career researchers and others interested in these areas.
Article
Physics, Applied
Bolei Deng, Hang Shu, Jian Li, Chengyang Mo, Jordan R. Raney, Vincent Tournat, Katia Bertoldi
Summary: In this study, we investigate the propagation of nonlinear pulses along the free surface of flexible metamaterials based on the rotating squares mechanism. We demonstrate that these materials can support the stable propagation of nonlinear pulses along their free surface, in addition to the previous support for elastic vector solitons through their bulk. We also show that minimizing interactions with linear dispersive surface modes increases the stability of these surface pulses. Guidelines are provided for selecting geometries that minimize such interactions.
APPLIED PHYSICS LETTERS
(2023)
Article
Construction & Building Technology
Shilin Qu, Benoit Hilloulin, Jacqueline Saliba, Mehdi Sbartai, Odile Abraham, Vincent Tournat
Summary: Nonlinear Coda Wave Interferometry (NCWI) is a robust tool for assessing nonlinearity caused by cracks in highly heterogeneous materials such as concrete. This study presents a novel qualitative method called Imaging using NCWI (INCWI), which combines NCWI and a spatial averaging method. The method is used to locate cracks in a concrete beam subjected to three-point bending.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Acoustics
Shilin Qu, Benoit Hilloulin, Olivier Chupin, Jean-Michel Piau, Odile Abraham, Vincent Tournat
Summary: Nonlinear Coda Wave Interferometry (NCWI), an ultrasonic method, has been developed in Non-Destructive Testing and Evaluation (NDT&E) to detect cracks in heterogeneous materials. This method uses pump waves to interact with the crack breathing and measures the resulting signal at receiver probes. Simulation models are used to determine the effect of pump waves on cracks and calculate the pump stress amplitude. Numerical results show a linear relationship between relative crack length variation and equivalent static load. The calculated NCWI outputs agree with experimental results on a slightly damaged 2D glass plate.
Article
Physics, Fluids & Plasmas
A. Demiquel, V. Achilleos, G. Theocharis, V. Tournat
Summary: In this paper, the modulation instabilities (MI) in a one-dimensional chain configuration of a flexible mechanical metamaterial (flexMM) are studied. The flexMMs can be modeled using the lumped element approach, which represents a coupled system of discrete equations for the longitudinal displacements and rotations of the rigid mass units. A nonlinear Schrodinger equation for slowly varying envelope rotational waves is derived using the multiple-scales method in the long wavelength regime. The occurrence of MI is mapped to the parameters of the metamaterials and the wave numbers, highlighting the importance of the rotation-displacement coupling in the manifestation of MI. The analytical findings are confirmed through numerical simulations of the full discrete and nonlinear lump problem. These results provide design guidelines for nonlinear metamaterials with either stability to high amplitude waves or potential for observing instabilities.
Proceedings Paper
Engineering, Electrical & Electronic
B. Ungureanu, V Tournat, R. Craster, S. Guenneau
Summary: The experiment validates the concept of large scale clamped metamaterials with surface seismic waves propagating in soft soil, proving the feasibility of a seismic shield with wave absorption capability at the meter scale. The analysis is based on homogenization theory and perturbation theory, taking into account the granular nature of the medium.
2021 FIFTEENTH INTERNATIONAL CONGRESS ON ARTIFICIAL MATERIALS FOR NOVEL WAVE PHENOMENA (METAMATERIALS)
(2021)
