Elastic Recovery Properties of Ultralight Carbon Nanotube/Carboxymethyl Cellulose Composites

Matsushima, Kazuki; Ono, Kiyomi; Yanagi, Reo; Shioura, Naoto; Segi, Takahiro; Ueno, Tomonaga

doi:10.3390/ma14144059

Cited by 3 publications

(4 citation statements)

References 35 publications

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“…The SWCNT–CMC dispersion was prepared by ultrasonication of a mixture of SWCNTs with a diameter of ≈ 2 nm and CMC; as CMC prevents the aggregation of SWCNTs in water and disperses them sufficiently, the dispersion containing SWCNT–CMC composite nanofibers can be easily obtained by ultrasonication. [ 35 ] The ultralight SWCNT aerogels were prepared by freezing the SWCNT–CMC dispersion at −80 °C, followed by a freeze‐drying process (Figure 1a). The samples were prepared by varying the SWCNT content in the range of 20–50 wt% and ρ in the range of 2.5–10 mg cm −3 , which are henceforth named CNT‐X‐Y (where X is the weight percentage of SWCNTs [wt%], and Y is ρ [mg cm −3 ]).…”

Section: Resultsmentioning

confidence: 99%

“…The surface of the prepared sample had a hierarchical porous structure consisting of large pores with diameters ranging from 15 to 500 μm and small pores with diameters ranging from 63 to 127 nm. The size of these pores depends on the SWCNT content and ρ [ 35 ] ; specifically, as ρ increases, the pore diameter decreases. The fiber diameters of SWCNT–CMC composite nanofibers analyzed from SEM images magnifying the framework (Figure 1f–j) are summarized in Table 1 .…”

Section: Resultsmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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

et al. 2022

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“…Composites of CMC with ultra-light configurations of different nanofillers such as CNTs and GNPs make the CMC highly flexible, conductive, and durable. 11,12 Ryotaro et al used CMC/CNTs with the remaining conductivity and catalytic ability of CNTs in electrochemical sensors. 13 Toya Fukuda et al used CMC as a surfactant to disperse MWCNTs in an aqueous solution, enabling thin film formation through a simple drop-casting layer-by-layer process.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, due to the high solubility of CMC in water, the preparation of CPCs with CMC is eco‐friendly, while the preparation of CMC with conductive polymers requires toxic solvents. Composites of CMC with ultra‐light configurations of different nanofillers such as CNTs and GNPs make the CMC highly flexible, conductive, and durable 11,12 . Ryotaro et al used CMC/CNTs with the remaining conductivity and catalytic ability of CNTs in electrochemical sensors 13 .…”

Section: Introductionmentioning

confidence: 99%

Enhanced the properties of carbon‐paste nanocomposite by carboxylation of multi‐walled carbon nanotubes

Shadabfar,

Ehsani,

Khonakdar

et al. 2023

Polymer Composites

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In the present study, attempts were made to manufacture innovative conducting polymer nanocomposites (CPCs) with high performance, low cost, and appropriate electrical, mechanical, and thermal properties. However, one of the main challenges in creating CPCs is the tendency of nanofillers to agglomerate and accumulate, resulting in a decrease in the electrical properties and performance of CPCs. To address this issue, the study developed an efficient and eco‐friendly CPC using carboxymethyl cellulose (CMC) as a binder and carbon nanotubes (CNTs) and graphene nanoplatelets (GNPs) as nanofillers. The study employed a chemical functionalization method to modify CNTs and enhance their compatibility and dispersion properties in the CMC matrix. The prepared CPCs were characterized using various techniques, including Fourier‐transform infrared spectroscopy, x‐ray diffraction, and field emission scanning electron microscopy. The results showed an improvement in homogeneity and surface cohesion between CMC and O‐CNTs through chemical surface modification of CNTs via carboxylic acid functional groups. The study observed good dispersion of nanofillers without any aggregation of the CMC/GNP/O‐CNT compared with the nontreated CMC/GNP/CNT composite. While a decrease in the degree of crystallinity was observed, conductivity increased for the CPC containing oxidized CNTs. The study found that the highest conductivity of ~112 S/m was obtained for D‐CMC/GNP/O‐CNT with 25 wt% of O‐CNT, while the maximum conductivity of D‐CMC/GNP/CNT was ~80 S/m with 35 wt% of CNTs. Additionally, the study observed an improvement in electrochemical properties after treatment of CNTs in the form of higher cathodic current in cyclic voltammetry and lower charge transfer resistance in impedance spectroscopy of D‐CMC/GNP/O‐CNT35 compared to untreated one.Highlights Preparation of new conductive nanocomposite consisting of CMC, CNTs, and GNPs. Carboxylation of CNTs to improve O‐CNT and CMC intermolecular interaction CMC/GNP/O‐CNT is 40% more conductive than unmodified CNT nanocomposite. Higher thermal stability and mechanical properties were observed by using O‐CNT. O‐CNT caused higher current density and lower electron transfer resistance for CPCs.

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High-speed and scalable combustion fabrication of ultralight carbon nanotube aerogels below air density

Yanagi,

Okuno,

Ueno

2024

Carbon

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Elastic Recovery Properties of Ultralight Carbon Nanotube/Carboxymethyl Cellulose Composites

Cited by 3 publications

References 35 publications

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

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

Enhanced the properties of carbon‐paste nanocomposite by carboxylation of multi‐walled carbon nanotubes

High-speed and scalable combustion fabrication of ultralight carbon nanotube aerogels below air density

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