Fabrication and Characterization of Porous Silica/Carbon Nanotube Composite Insulation

Shioura, Naoto; Matsushima, Kazuki; Osato, Tomoki; Ueno, Tomonaga; Isu, Norifumi; Hashimoto, Takeshi; Yana, Takumi

doi:10.1557/adv.2020.252

Cited by 3 publications

(3 citation statements)

References 21 publications

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“…[28] SWCNTs are nanotubes with a high elastic modulus of 1000 GPa per fiber, [29] which is ideal for increasing the acoustic energy loss of the framework of ultralight materials. CMC disperses SWCNTs sufficiently in water, [30,31] and the dispersion solution containing SWCNT-CMC composite nanofibers can be easily obtained by ultrasonication. The hierarchical porous framework fabricated by a freeze-drying process using the growth of ice in the dispersion as a template produces ultralight and robust aerogels because it consists of strong SWCNT-CMC composite nanofiber networks.…”

Section: Introductionmentioning

confidence: 99%

Ultralight Single‐Walled Carbon Nanotube Aerogels for Low‐Frequency Sound Absorption

et al. 2022

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Absorbing low-frequency sound below 1000 Hz with an ultralight material is a critical challenge. Nanofibrous sound-absorbing materials have many interfaces for air-borne sound loss. In addition, nanofibers with a high elastic modulus can increase the loss of sound propagating in the solid, enabling good, lowfrequency sound absorption. Herein, a composite aerogel based on singlewalled carbon nanotubes (SWCNTs) and carboxymethyl cellulose (CMC) as an ultralight material that effectively absorbs low-frequency sound is reported. This ultralight aerogel has a hierarchical porous structure composed of highmodulus SWCNT-CMC composite nanofibers. A sample with an areal density of 20 mg cm À2 (bulk density: 5 mg cm À3 , thickness: 39 mm) achieves a soundabsorption coefficient of 0.44 at 500 Hz. The sound-absorption behavior is sufficiently described by the Biot-Johnson-Champoux-Allard model, indicating the significant effect of the high elastic modulus of the nanofibers on the soundabsorption performance. The article presents a new design principle for ultralight materials with low-frequency sound absorption that takes into consideration both the porous structure and the elastic modulus of the material framework.

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Section: Introductionmentioning

confidence: 99%

Ultralight Single‐Walled Carbon Nanotube Aerogels for Low‐Frequency Sound Absorption

et al. 2022

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“…Aerogels 1 and metallic microlattices 2 , 3 are typical lightweight materials with large specific surface areas. As a result, they are attracting attention as structural materials as well as adsorbents 4 , 5 , energy storage materials 6 , catalyst support materials 7 , and thermal insulators 8 . To the best of our knowledge, the lightest material reported thus far is a ceramic aerogel with a density of 0.10 mg cm −3 9 .…”

Section: Introductionmentioning

confidence: 99%

Light-induced levitation of ultralight carbon aerogels via temperature control

Yanagi

Takemoto

Ono

et al. 2021

Sci Rep

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We demonstrate that ultralight carbon aerogels with skeletal densities lesser than the air density can levitate in air, based on Archimedes' principle, when heated with light. Porous materials, such as aerogels, facilitate the fabrication of materials with density less than that of air. However, their apparent density increases because of the air inside the materials, and therefore, they cannot levitate in air under normal conditions. Ultralight carbon aerogels, fabricated using carbon nanotubes, have excellent light absorption properties and can be quickly heated by a lamp owing to their small heat capacity. In this study, an ultralight carbon aerogel was heated with a halogen lamp and levitated in air by expanding the air inside as well as selectively reducing its density. We also show that the levitation of the ultralight carbon aerogel can be easily controlled by turning the lamp on and off. These findings are expected to be useful for various applications of aerogels, such as in communication and transportation through the sky.

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“…In particular, ultralight materials based on nanocarbons, such as carbon nanotubes (CNTs) and graphene, have attracted attention in many applications such as sensors, electrodes, insulators, and adsorbents [ 9 , 10 , 11 , 12 , 13 ]. These ultralight materials are generally fabricated in the density range of less than 10 mg/cm 3 , and much research has been conducted on the correlation between their structure and mechanical properties [ 13 , 14 , 15 , 16 , 17 , 18 , 19 ]. In recent years, the weight of these ultralight materials has been further reduced, and materials of density approaching the air density (1.29 mg/cm 3 ) are being developed [ 1 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Elastic Recovery Properties of Ultralight Carbon Nanotube/Carboxymethyl Cellulose Composites

et al. 2021

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Ultralight materials exhibit superelastic behavior depending on the selection, blending, and carbonization of the materials. Recently, ultimate low-density materials of 5 mg/cm3 or less have attracted attention for applications such as sensors, electrodes, and absorbing materials. In this study, we fabricated an ultralight material composed of single-walled carbon nanotubes (CNT) and sodium carboxymethyl cellulose (CMC), and we investigated the effect of density, composition, and weight average molecular weight of CMC on elastic recovery properties of ultralight CNT/CMC composites. Our results showed that the elastic recovery properties can be improved by reducing the density of the composite, lowering the mass ratio of CNTs, and using CMC with small molecular weight.

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Fabrication and Characterization of Porous Silica/Carbon Nanotube Composite Insulation

Cited by 3 publications

References 21 publications

Ultralight Single‐Walled Carbon Nanotube Aerogels for Low‐Frequency Sound Absorption

Ultralight Single‐Walled Carbon Nanotube Aerogels for Low‐Frequency Sound Absorption

Light-induced levitation of ultralight carbon aerogels via temperature control

Elastic Recovery Properties of Ultralight Carbon Nanotube/Carboxymethyl Cellulose Composites

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