Metamaterial-like aerogels for broadband vibration mitigation

Malakooti, Sadeq; Hatamleh, Mohammad I.; Zhang, Rui; Taghvaee, Tahereh; Miller, Max; Ren, Yao; Xiang, Ning; Qian, Dong; Sotiriou‐Leventis, Chariklia; Leventis, Nicholas; Lu, Hongbing

doi:10.1039/d1sm00074h

Cited by 7 publications

(7 citation statements)

References 38 publications

(48 reference statements)

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“…The most well-studied class of aerogels is based on silica. ,, However, silica aerogels are notorious for their fragility, which limits the range of their applications. One way to address the fragility issue of oxide aerogels is to apply a conformal nanothin polymer coating over their entire skeletal framework. − These materials are referred to as X-aerogels, and their strength-to-mass ratio renders them suitable even for ballistic protection (armor). − The topology of the nanoscopic composition of X-aerogels directed the rational design and development of purely polymeric aerogels from all major classes of polymers ranging from polyolefins, and phenolic resins including polybenzoxazines, polyimides, polyamides, and polyureas to polyurethanes. − The latter class of aerogels includes recently reported rubber-like superelastic poly(isocyanurate–urethane) (PIR–PUR) aerogels that show a strong nanostructure-dependent shape-memory effect triggered by a temperature swing around their glass transition temperature. − …”

Section: Introductionmentioning

confidence: 99%

Meta-Aerogels: Auxetic Shape-Memory Polyurethane Aerogels

Malakooti

Doulah

Ren

et al. 2021

ACS Appl. Polym. Mater.

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Shape-memory poly(isocyanurate−urethane) (PIR−PUR) aerogels are low-density monolithic nanoporous solids that remember and return to their permanent shape through a heating actuation step. Herein, through structural design at the macro scale, the shape-memory response is augmented with an auxetic effect manifested by a negative Poisson's ratio of approximately −0.8 at 15% compressive strain. Thus, auxetic shape-memory PIR−PUR monoliths experience volume contraction upon compression at a temperature above the glass transition temperature of the base polymer (T g ≈ 30 °C), and they can be stowed indefinitely in that temporary shape by cooling below T g . By heating back above T g , the compressed/shrunk form expands back to their original shape/ size. This technology is relevant to a broad range of industries spanning the commercial, aeronautical, and aerospace sectors. The materials are referred to as meta-aerogels, and their potential applications include minimally invasive medical devices, soft robotics, and situations where volume is at a premium, as for example for storage of deployable space structures and planetary habitats during transport to the point of service.

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Section: Introductionmentioning

confidence: 99%

Meta-Aerogels: Auxetic Shape-Memory Polyurethane Aerogels

Malakooti

Doulah

Ren

et al. 2021

ACS Appl. Polym. Mater.

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“…Owing to the unique combination of excellent properties such as low thermal conductivity, low dielectric constant, and a high-degree of flexibility, polymer aerogels have been considered a novel advanced material with high commercialization potential and therefore recently attracted research attention for vibro-acoustic mitigation applications. [32] Yao et al reported the first acoustic characterization of a phenolic aerogel material system that was prepared by freeze-drying method. [100] They studied a sandwich microstructural material system comprised of three layers whereby the top and bottom layers exhibited a pyknotic structure, and the middle layer exhibited irregularly dispersed nanopores.…”

Section: Acoustic Properties Of Polymer Aerogelsmentioning

confidence: 99%

“…The examples of aerogels with net-like morphology are shown in Figure 3, all for aerogels based on polymers: polyimide, cellulose (dissolved in 8%NaOH-water and gelled), pectin (cross-linked with calcium), and nanofibrillated cellulose. Depending on the synthesis conditions, the fibrils in some synthetic polymer aerogels (polyimide, polyurea) may have a "caterpillar" morphology (not shown, see, for example, [32,33] ).…”

Section: (C)mentioning

confidence: 99%

“…Owing to the unique combination of excellent properties such as low thermal conductivity, low dielectric constant, and a high‐degree of flexibility, polymer aerogels have been considered a novel advanced material with high commercialization potential and therefore recently attracted research attention for vibro‐acoustic mitigation applications. [ 32 ]…”

Section: Acoustic Properties Of Polymer Aerogelsmentioning

confidence: 99%

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Acoustic Properties of Aerogels: Current Status and Prospects

et al. 2022

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Noise pollution has been aptly described as one of the modern plagues. [1] Due to many adverse health effects of loud environments, ranging from sleep disturbances to cardiovascular diseases, reducing the exposure of humans to excess noise is essential to the public health of large populations living in the cities. Regarding sound absorption materials, the optimal choice depends on the intended sound frequency range; solutions of damping high-frequency sound waves rely on totally different absorption mechanism than the solutions for very low-frequency noise. Indoors, the most commonly used sound absorption materials are porous by nature due to their ability to efficiently absorb sound at mid to high frequencies with relatively thin layers. Common porous absorption materials in the market, targeting to over 90% absorption above 350 Hz, are glass and mineral wools and acoustic foams made, e.g., from melamine or polyurethane. Here, we review the acoustic properties of aerogels and demonstrate their high potential to challenge and exceed the absorption properties of the current market standards, whether we talk about the performance in

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“…Alternatively, polymer aerogels can be synthesized with a highly tortuous and mesoporous microstructure with excellent mechanical properties at a bulk density similar to the ones corresponding to silica aerogels [15][16][17][18][19][20] . Polymer aerogels exhibit high ductility with mechanical properties such as Young's modulus orders of magnitude higher than the corresponding values for silica aerogels [21][22][23][24] .…”

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confidence: 99%

Polyimide aerogels for ballistic impact protection

Malakooti

Vivod

Pereira

et al. 2022

Sci Rep

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The ballistic performance of edge-clamped monolithic polyimide aerogel blocks (12 mm thickness) has been studied through a series of impact tests using a helium-filled gas gun connected to a vacuum chamber and a spherical steel projectile (approximately 3 mm diameter) with an impact velocity range of 150–1300 m s−1. The aerogels had an average bulk density of 0.17 g cm−3 with high porosity of approximately 88%. The ballistic limit velocity of the aerogels was estimated to be in the range of 175–179 m s−1. Moreover, the aerogels showed a robust ballistic energy absorption performance (e.g., at the impact velocity of 1283 m s−1 at least 18% of the impact energy was absorbed). At low impact velocities, the aerogels failed by ductile hole enlargement followed by a tensile failure. By contrast, at high impact velocities, the aerogels failed through an adiabatic shearing process. Given the substantially robust ballistic performance, the polyimide aerogels have a potential to combat multiple constraints such as cost, weight, and volume restrictions in aeronautical and aerospace applications with high blast resistance and ballistic performance requirements such as in stuffed Whipple shields for orbital debris containment application.

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Metamaterial-like aerogels for broadband vibration mitigation

Abstract: We report a mechanical metamaterial-like behavior as a function of micro/nanostructure of otherwise chemically identical aliphatic polyurea aerogels. Transmissibility varies dramatically with frequency in these aerogels. Broadband vibration mitigation is...

Cited by 7 publications

References 38 publications

Meta-Aerogels: Auxetic Shape-Memory Polyurethane Aerogels

Meta-Aerogels: Auxetic Shape-Memory Polyurethane Aerogels

Acoustic Properties of Aerogels: Current Status and Prospects

Polyimide aerogels for ballistic impact protection

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