Comparison of characteristics of single-walled carbon nanotubes obtained by super-growth CVD and improved-arc discharge methods pertaining to interfacial film formation and nanohybridization with polymers

Almarasy, Ahmed A.; Hayasaki, Takuto; Abiko, Yoshinori; Kawabata, Youhei; Akasaka, Shuichi; Fujimori, Atsuhiro

doi:10.1016/j.colsurfa.2021.126221

Cited by 13 publications

(12 citation statements)

References 42 publications

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Section: Resultssupporting

confidence: 93%

“…In addition, the entanglement between the aggregated fibers was remarkable. Previous studies have confirmed a higher crystalline order in the organized membranes of organo-modified iA SWCNTs, [47] and our results correspond well with these observations. Figure 4 shows the POM and digital camera images of samples of FDP-iA SWCNTs and FDP-sg SWCNTs combined with the PVDF matrix.…”

Section: Morphological Evaluation Of the Two Types Of Swcnts And Disp...supporting

confidence: 93%

“…[ 46 ] In the past, interfacial monolayer properties were compared for surface modified SWCNTs derived from the super‐growth CVD and the iAD methods. [ 47 ] Here, the high crystallinity of SWCNTs derived from the iAD method was observed, and it was predicted that the SWCNTs would have excellent aggregation characteristics [ 47 ] (Middle diagram of Figure 1).…”

Section: Introductionmentioning

confidence: 99%

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Nanofiller dispersing, drawn orientation, and mechanical properties of polymer‐based composites via organo‐modification of single‐walled carbon nanotubes obtained by two‐types of manufacturing processes

Harada

Almarasy

et al. 2022

Polymer Composites

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The filler dispersibility, structural changes by drawing, and mechanical properties of polymer‐based composites containing two types of organo‐modified single‐walled carbon nanotubes (SWCNTs) fabricated using different methods were investigated. In this study, the SWCNTs manufactured by super‐growth chemical vapor deposition (CVD) and improved arc discharge (iAD) were used. Further, they were surface‐modified with fluorinated phosphonic acid, and the composites were prepared with crystalline fluoropolymer by melt compounding. By introducing a very small amount of fluorinated phosphonic acid as a dispersion aid, jet‐black composites with uniform dispersibility were obtained. In the high‐temperature drawing process, the aggregated SWCNTs in the composites were uniaxially oriented along the drawing direction. The crystallinity and mechanical properties of the composites were significantly improved by the composite preparation with SWCNTs and their drawing orientation. The SWCNTs derived from the super‐growth CVD method exhibited excellent dispersibility in the matrix polymer, and the composite containing SWCNTs derived from iAD method had excellent mechanical properties.

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Section: Resultssupporting

confidence: 93%

Section: Morphological Evaluation Of the Two Types Of Swcnts And Disp...supporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Nanofiller dispersing, drawn orientation, and mechanical properties of polymer‐based composites via organo‐modification of single‐walled carbon nanotubes obtained by two‐types of manufacturing processes

Harada

Almarasy

et al. 2022

Polymer Composites

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“…[ 28–30 ] However, as mentioned above, there are generally few examples of improving the function of fluorinated crystalline polymers by compounding because of their phase separation characteristics. Therefore, attempts have been made to prepare nanocomposites by mixing oxide‐inorganic nanoparticles [ 31 ] and nanocarbon materials, [ 32,33 ] of which the surfaces have been chemically modified by a fluorocarbon‐based surfactant, with a fluorinated polymer via a simple melt‐compounding method. [ 34 ] Single‐walled carbon nanotubes (SWCNTs), [ 35,36 ] which have an elegant one‐dimensional structure, [ 37 ] high functionality, [ 38 ] and outstanding aggregation characteristics, have been used in nanocomposite preparation with incompatible fluorocarbon‐based polymers using the same method (Figure 1, middle part).…”

Section: Introductionmentioning

confidence: 99%

Study on the improvement of dispersibility and orientation control of fluorocarbon‐modified single‐walled carbon nanotubes in a fluorinated polymer matrix

Hayasaki

Yamada

et al. 2021

Polymer Composites

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A technique for improving the dispersibility of fluorocarbon-modified, singlewalled carbon nanotubes (SWCNTs) in fluorinated polymers was investigated. Furthermore, we aimed to achieve uniaxial orientation of SWCNT aggregates via a simple high-temperature drawing method to yield fluoropolymer-based nanocomposites containing uniform dispersed SWCNTs. Highly waterrepellent SWCNTs were mixed with phase-separable fluorinated polymers by the chemical modification of their surfaces with fluorocarbons. Introducing a fluorinated phosphonic acid surfactant with a high-sublimation temperature as the third component to improve dispersibility in the polymer matrix resulted in an innovative improvement. The uniform dispersed SWCNTs in the matrix improved the crystallinity, crystallization temperature, and mechanical characteristics of the composites. The high-temperature uniaxial orientation of the composite material reduced differences in the physical properties in the polymer due to differences in the initial dispersibility. This effect was expected since the drawing process promoted the deagglomeration of SWCNTs in the matrix. However, optimal physical properties were observed in SWCNT-oriented composite samples with an excellent initial dispersion.

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“…Among CNTs, single-walled CNTs (SWCNTs) have particularly excellent physical properties for application. The technology for highly efficient production of SWCNTs has been established in recent years and the problem of high production costs has been solved (Almarasy et al, 2021;Hata et al, 2004). This will lead to the expansion of the market of CNTs and the development of a wider range of applications.…”

Section: Introductionmentioning

confidence: 99%

Non-enzymatic degradation of carbon nanotubes in the presence of bacterial enzymes

Hori

Takahashi

Taguchi

2021

Preprint

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The enzymatic degradation of carbon nanotubes (CNTs) by several enzymes has been reported. However, because organisms that possess these enzymes have limited habitats and distribution areas, it is unclear whether CNTs can be degraded in the general environment. The investigation of CNTs degradation by enzymes derived from bacteria, which inhabit a wide range of environments and have diverse metabolic systems, is inevitable for predicting the environmental fate of CNTs. In this study, the degradation of oxidized (carboxylated) single-walled CNTs (O-SWCNTs) by mt2DyP, a dye-decolorizing peroxidase of Pseudomonas putida mt-2, a common soil bacterium, was investigated. Suspensions of O-SWCNTs gradually became transparent and their optical absorbance decreased during 30 d of incubation in the presence of mt2DyP produced by a recombinant Brevibacillus choshinensis strain and its substrate, H2O2. The degradation was enhanced by higher H2O2 concentrations. The measurement of Raman spectra revealed the complete degradation of O-SWCNTs after 30 d of incubation with 100 mM H2O2. However, surprisingly, this heme enzyme was inactivated within 60 min of the incubation with O-SWCNTs, which suggested that the degradation of O-SWCNTs was not catalyzed by the enzyme. The inactivation of mt2DyP was accompanied by the release of iron, which suggested that the degradation of the O-SWCNTs was owing to the Fenton reaction caused by the iron released from mt2DyP and the supplied H2O2. A chelating agent, diethylenetriaminepentaacetic acid, significantly inhibited the O-SWCNTs degradation, proving the degradation by the Fenton reaction. These phenomena were also observed with another heme enzyme, Cytochrome P450. These results are important for predicting the fate of CNTs in a wide range of environments, as heme enzymes are secreted by many bacteria in the environment. This study also shows that the effect of the Fenton reaction should be considered to validate the degradation of CNTs by heme enzymes.

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Comparison of characteristics of single-walled carbon nanotubes obtained by super-growth CVD and improved-arc discharge methods pertaining to interfacial film formation and nanohybridization with polymers

Cited by 13 publications

References 42 publications

Nanofiller dispersing, drawn orientation, and mechanical properties of polymer‐based composites via organo‐modification of single‐walled carbon nanotubes obtained by two‐types of manufacturing processes

Nanofiller dispersing, drawn orientation, and mechanical properties of polymer‐based composites via organo‐modification of single‐walled carbon nanotubes obtained by two‐types of manufacturing processes

Study on the improvement of dispersibility and orientation control of fluorocarbon‐modified single‐walled carbon nanotubes in a fluorinated polymer matrix

Non-enzymatic degradation of carbon nanotubes in the presence of bacterial enzymes

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