A self-assembled flavin protective coating enhances the oxidative thermal stability of multi-walled carbon nanotubes

Kim, Somin; Jang, Minsu; Park, Minsuk; Park, No Hyung; Ju, Sang Yong

doi:10.1016/j.carbon.2017.02.098

Cited by 12 publications

(14 citation statements)

References 40 publications

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“…The two-step procedure developed for fabricating highly electrically conductive NMNT nanocomposites is portrayed in a schematic manner in Figure A–C. In the first step, the water-soluble surfactant FMN is utilized in a previously developed procedure , to individualize the MWNTs. In this process, ball milling of MWNT with a diameter of 11 nm in an aqueous FMN solution for 1 h (see Methods) leads to production of a MWNT in a black slurry, which is separated by filtration, washed with a copious amount of water, and lyophilized to produce individualized FMN-MWNT as a black powder.…”

Section: Results and Discussionmentioning

confidence: 99%

“…As a result, a second step involving annealing at 450 °C under an air atmosphere is performed to produce a modified form dFMN-MWNT that is compatible with the PA matrix (Figure B). Importantly, the annealing processes promote partial decomposition of the highly polar and negatively charged FMN side chain of FMN to mainly create a modified N -pentadienyl isoalloxazine form (dFMN) . The structures of MWNT and the isoalloxazine ring (orange color) remain intact in the annealing step, as evidenced by the observation of a quasi-periodic average 1 nm height of the helical wrapping of dFMN on MWNT by using atomic force microscopy (AFM) (see representative images in Figure S1A,B in the Supporting Information (SI)).…”

Section: Results and Discussionmentioning

confidence: 99%

“…On the other hand, flavin mononucleotide (FMN, see Figure A for chemical structure) is a phosphate analogue of riboflavin (or vitamin B 2 ) and is involved in various redox reactions as a cofactor in flavoproteins . In the context of nanomaterials, when used as a dispersing agent, FMN has preferential affinity − with nanomaterials whose curvatures vary in single- , and multiwalled carbon nanotubes, graphene, , and hexagonal boron nitride . Especially, FMN is capable of helical wrapping a carbon nanotube by three major driving forces: (i) concentric π–π interactions between an aromatic isoalloxazine ring and graphene sidewalls, (ii) quadruple hydrogen-bonding (H-bonding) between adjacent uracil moieties of antiparallelly running helical wrapped isoalloxazine ribbons, and (iii) anionic phosphate groups maintaining colloidal stability of dispersion.…”

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confidence: 99%

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Flavin Mononucleotide-Mediated Formation of Highly Electrically Conductive Hierarchical Monoclinic Multiwalled Carbon Nanotube-Polyamide 6 Nanocomposites

et al. 2020

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Although the multiwalled carbon nanotube (MWNT) is a promising material for use in the production of high electrical conductivity (σ) polymer nanocomposites, its tendency to aggregate and distribute randomly in a polymer matrix is a problematic issue. In the current study, we developed a highly conductive and monoclinically aligned MWNT-polyamide 6 (PA) nanocomposite containing interfacing flavin moieties. In this system, the flavin mononucleotide (FMN) initially serves as a noncovalent aqueous surfactant for individualizing MWNTs in the form of FMN-wrapped MWNTs (FMN-MWNT), and then partially decomposed FMN (dFMN) induces crystallization of the PA on the MWNTs. The results of experiments performed using material subjected to partial dissolution of PA matrix show that the nanocomposite PA-dFMN-MWNT, formed by melt extrusion of PA and dFMN-MWNT, contains a three-dimensional monoclinic MWNT network embedded in an equally monoclinic PA matrix. An increase in monoclinic network promoted by an increase in the content of MWNT increases σ of the nanocomposite up to 100 S/m, the highest value reported for a polymer-MWNT nanocomposite. X-ray diffraction along with transmission electron microscopy reveal that the presence of dFMN induces the formation of monoclinic PA on dFMN-MWNT. The high σ of the PA-dFMN-MWNT nanocomposite is also a consequence of a minimization of defect formation of MWNT by noncovalent functionalization. Hierarchical structural ordering, yet individualization of MWNTs, provides a viable strategy to improve the physical property of nanocomposites.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

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confidence: 99%

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Flavin Mononucleotide-Mediated Formation of Highly Electrically Conductive Hierarchical Monoclinic Multiwalled Carbon Nanotube-Polyamide 6 Nanocomposites

et al. 2020

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“…In those circumstances, high temperatures and repeated thermal cycles require thermal and thermos-oxidative stability of materials at elevated temperatures. In order to improve the thermal or thermo-oxidative stability, polyimide films are usually coated with metal or inorganic oxide protection layer or blended with inorganic fillers [23][24][25][26][27]. However, the mismatching of the coefficient of thermal expansion (CTE) between inorganic coatings and polymer matrices might result in serious troubles such as delamination, curl, or crack after harsh heat shocking [28].…”

Section: Introductionmentioning

confidence: 99%

Carborane-Containing Aromatic Polyimide Films with Ultrahigh Thermo-Oxidative Stability

Liu

Fang²,

Shen

et al. 2019

Polymers

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Carborane-containing aromatic polyimide (CPI) films with ultrahigh thermo-oxidative stability at 700 °C have been prepared by casting poly(amic acid) (PAA) resin solution on a glass surface, followed by thermal imidization at elevated temperatures. The PAA solution was prepared by copolymerization of an aromatic dianhydride and an aromatic diamine mixture, including carborane-containing aromatic diamine in an aprotic solvent. The CPI films showed excellent thermo-oxidative stability at 700 °C due to the multilayered protection layers formed on the film surface by thermal conversion of the carborane group into boron oxides. The boron oxide layer enhanced the degradation activation energy and suppressed the direct contact of inner polymer materials with oxygen molecules in a high-temperature environment, acting as a “self-healing” skin layer on the polyimide materials. The CPI-50 film was still flexible and maintained 50% retention of mechanical strength even after thermo-oxidative aging at 700 °C/5 min. The mechanism of thermo-oxidative degradation was proposed.

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“…Therefore, a facile approach to improve the oxidation stabilities of MWCNTs is a necessary component of efforts to broaden applications of these materials. Recently, Kim et al 36 enhanced the oxidative thermal stability of MWCNTs through their coating by Flavin mononucleotide for protecting the surface of nanotubes. However, the presence of protective coating around MWCNTs may cause restrictions for their properties and applications.…”

Section: Introductionmentioning

confidence: 99%

An effective and novel approach for enhancement of the oxidative thermal stability of multiwalled carbon nanotubes loaded polymer blend

Abu-Abdeen

Saber

Mazher

et al. 2019

Journal of Thermoplastic Composite Materials

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Multiwalled carbon nanotubes (MWCNTs) have wide range of applications. Commercial MWCNTs have impurities, disorder and entangled structure, which limit its applications. In this respect, novel, low-energy consumption and friendly technique was applied to enhance its structure. The technique is operated during isometric process inside autoclave and based on thermal treatment of MWCNTs in the presence of solvent and pressure. It was used to enhance the oxidative thermal stability of MWCNTs. Thermal gravimetric analysis results showed an increase in onset temperature, activation energy of decomposition, and the temperature required to loss 75, 50, and 33 wt% as the treating temperature increased. Raman spectroscopy tests showed a decrease in the degree of disorder from 1.29 for untreated samples to 0.45 for samples treated at 250°C. The electrical resistivity of MWCNTs was increased from 0.33 Ω.cm for untreated samples to 0.54 Ω cm for 250°C treated samples. Advantages of thermal treatment of MWCNTs using this technique appeared in the presence of a percolation behavior for the AC electrical conductivity when a polymer matrix was loaded with it with a threshold percolation concentration of 0.7 wt%. Furthermore, Cole–Cole Z semicircles as well as Argand plots of the electric modulus appeared for polymer matrix loaded with thermally treated MWCNTs beyond the threshold percolation concentration.

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A self-assembled flavin protective coating enhances the oxidative thermal stability of multi-walled carbon nanotubes

Cited by 12 publications

References 40 publications

Flavin Mononucleotide-Mediated Formation of Highly Electrically Conductive Hierarchical Monoclinic Multiwalled Carbon Nanotube-Polyamide 6 Nanocomposites

Flavin Mononucleotide-Mediated Formation of Highly Electrically Conductive Hierarchical Monoclinic Multiwalled Carbon Nanotube-Polyamide 6 Nanocomposites

Carborane-Containing Aromatic Polyimide Films with Ultrahigh Thermo-Oxidative Stability

An effective and novel approach for enhancement of the oxidative thermal stability of multiwalled carbon nanotubes loaded polymer blend

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