Microwave and Acoustic Absorption Metamaterials

Qu, Sichao; Sheng, Ping

doi:10.1103/physrevapplied.17.047001

Cited by 44 publications

(18 citation statements)

References 134 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Section: Development and Categories Of Metamaterialsmentioning

confidence: 99%

“…[3] The intelligent manipulation of acoustic wave through tailored structures and elastic properties enables acoustic metamaterials to have a wide range of applications in acoustic absorber, cloaking, and anomalous refraction. [84,85] Recently, many advanced metastructures have been reported. [4,[86][87][88][89][90] For example, Groby et al [91] designed a perfect, broadband, and asymmetric sound absorption by using subwavelength panels.…”

Section: Acoustic Metamaterialsmentioning

confidence: 99%

See 1 more Smart Citation

3D Printed Graphene‐Based Metamaterials: Guesting Multi‐Functionality in One Gain

et al. 2023

Small

View full text Add to dashboard Cite

Advanced functional materials with fascinating properties and extended structural design have greatly broadened their applications. Metamaterials, exhibiting unprecedented physical properties (mechanical, electromagnetic, acoustic, etc.), are considered frontiers of physics, material science, and engineering. With the emerging 3D printing technology, the manufacturing of metamaterials becomes much more convenient. Graphene, due to its superior properties such as large surface area, superior electrical/thermal conductivity, and outstanding mechanical properties, shows promising applications to add multi‐functionality into existing metamaterials for various applications. In this review, the aim is to outline the latest developments and applications of 3D printed graphene‐based metamaterials. The structure design of different types of metamaterials and the fabrication strategies for 3D printed graphene‐based materials are first reviewed. Then the representative explorations of 3D printed graphene‐based metamaterials and multi‐functionality that can be introduced with such a combination are further discussed. Subsequently, challenges and opportunities are provided, seeking to point out future directions of 3D printed graphene‐based metamaterials.

show abstract

Section: Development and Categories Of Metamaterialsmentioning

confidence: 99%

Section: Acoustic Metamaterialsmentioning

confidence: 99%

3D Printed Graphene‐Based Metamaterials: Guesting Multi‐Functionality in One Gain

et al. 2023

Small

View full text Add to dashboard Cite

show abstract

“…This property of attenuation could be due to the formation of special graphene membranes on the polymer matrix-like resonating structure generated in the GDPS. 30 Graphene is a two-dimensional nanomaterial with a sheetlike internal configuration and structure. Therefore, the selfassembly of graphene in membrane form under specified conditions could generate novel laminar-like structures.…”

Section: Morphological Evidence For Microstructural Transformation Of...mentioning

confidence: 99%

Carbon Nanotubes/Polyurethane Foam for Noise Passivation at 4000 Hz

Agrawal,

Gaur,

Mani

et al. 2023

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Occupational noise-induced hearing loss prominently occurs due to unavoidable sound frequencies mainly in the range of 3000 to 6000 Hz. This frequency region thus holds great importance for acoustic insulation. Polymeric foams with open cellular frameworks are mostly employed for sound absorption in these frequency regions. To enhance their sound-absorbing ability, nanofillers are integrated with the polymeric matrix. However, the majority of the incorporation methods result in a single-phased porous structure, which limits their potential. Herein, an altered method of modification of multiwall carbon nanotubes (MWCNTs) is explored for the preparation of modified polyurethane foam via a simple one-pot immersion-hydrothermal-evaporation method. A unique self-assembled nanolayered structure with nanopores was fabricated through optimized experimental conditions resembling a double three-dimensional form. This gave rise to an additional resonating-type structure within the porous-type matrix. Thus, a hybrid-type sound-absorbing material with distinctive structure was fabricated which could help achieve focused sound absorption ability at the desired frequency. The sound pressure level evaluated at a frequency of 4000 Hz was found to improve through incorporation of 0.5 wt % modified CNTs. The mean percentage enhancement in sound isolation for treated foam in comparison to untreated foam is 15 to 20% at 4000 Hz. The development of distinctive structures within the polymeric framework opens up a plethora of horizons that could be employed at the industrial level as well, and such structures could be engaged for achieving other eccentric properties, which would further enhance their applicability.

show abstract

“…Among the passive design strategies, the use of coupled resonators, of either monopolar or dipolar types, has been extensively studied (see, for example, [25,26,33] , chapter 3 of [34], chapter 5 of [35], etc.). In the unidimensional (1D) reflection problem (either with a rigid boundary [36][37][38] or a soft boundary [39] ), perfect absorption can be realized at a given frequency by using a single resonator. In the opposite, the maximum absorption coefficient that can be achieved with either a single monopolar or a dipolar type resonator is α max = 1/2 in the 1D transmission problem [25,[40][41][42] ; to yield perfect absorption, at least two coupled resonators are necessary, because both types of resonances at the same frequency are required to suppress the reflection and the transmission simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Subwavelength Broadband Perfect Absorption for Unidimensional Open‐Duct Problems

Meng

Romero‐García

Gabard

et al. 2023

Adv Materials Technologies

View full text Add to dashboard Cite

Passive metamaterials provide efficient solutions for sound absorption in the low‐frequency regime with deep subwavelength dimensions. They have been extensively applied in unidimensional reciprocal problems considering that an incident wave is either reflected or transmitted at the outlet boundary. However, the generalized problem with impedance boundary condition is not well understood yet. This work presents a general design methodology of metamaterial absorbers for open‐duct problems, which is a special case of impedance outlet boundary encountered in broad practical applications, for example, noise‐attenuation problems in heat ventilation and air conditioning systems. By properly using monopolar point scatterers made of arrays of Helmholtz resonators, the design process is significantly simplified; the transfer matrix modeling is sufficiently accurate to describe the acoustic response of the system. A single monopolar point scatterer is insufficient to attenuate both the reflected and radiated waves; a frequency‐dependent maximum absorption exists and is derived analytically. To go beyond this absorption bound and achieve perfect absorption, at least two point scatterers are necessary. Specific designs are provided and validated experimentally for maximum or perfect absorption, either at single frequencies or over specific frequency bands.

show abstract

Microwave and Acoustic Absorption Metamaterials

Cited by 44 publications

References 134 publications

3D Printed Graphene‐Based Metamaterials: Guesting Multi‐Functionality in One Gain

3D Printed Graphene‐Based Metamaterials: Guesting Multi‐Functionality in One Gain

Carbon Nanotubes/Polyurethane Foam for Noise Passivation at 4000 Hz

Subwavelength Broadband Perfect Absorption for Unidimensional Open‐Duct Problems

Contact Info

Product

Resources

About