Influence of matching solubility parameter of polymer matrix and CNT on electrical conductivity of CNT/rubber composite

Ata, Seisuke; Mizuno, Takaaki; Nishizawa, Ayumi; Subramaniam, Chandramouli; Futaba, Don N.; Hata, Kenji

doi:10.1038/srep07232

Cited by 58 publications

(61 citation statements)

References 28 publications

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“…1. Integrity of hexagonal structure of the MWCNT was confirmed by the presence of peak at 1533 cm −1 which evidences the existence of carbon double bond (C C) [21]. The spectrum showed absorption bands at 3437 cm −1 assigned to OH stretching.…”

Section: Ft-irmentioning

confidence: 67%

Radio frequency plasma mediated dry functionalization of multiwall carbon nanotube

Nair

Mahapatra

Nageswaran

et al. 2015

Applied Surface Science

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Section: Ft-irmentioning

confidence: 67%

Radio frequency plasma mediated dry functionalization of multiwall carbon nanotube

Nair

Mahapatra

Nageswaran

et al. 2015

Applied Surface Science

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“…The solubility parameters indicate the degree of interaction between materials. As mentioned in the Introduction, matching the solubility parameter of a carbon nanomaterial with the neighboring materials is the prerequisite to favor separation of the nanomaterial into individual particles [54] and to achieve ultimate dispersion in a polymer Unauthenticated Download Date | 5/12/18 9:50 AM matrix [57]. In this work, the dispersion of HSAG-PyC adduct in a solvent was inspected upon sonication and, in case of homogeneous dispersion (HSAG-PyC did not settle down or float on the solvent), was monitored also after 1 week storage at rest.…”

Section: Resultsmentioning

confidence: 99%

“…It has been shown [54] that a solvent able to minimize the Gibbs free energy of mixing with graphene and carbon nanotubes is able to promote the debundling of the tubes and the exfoliation of graphene aggregates. Moreover, matching the solubility parameters of polymer matrix and CNT leads to easier percolation of the nanofiller and Unauthenticated Download Date | 5/12/18 9:50 AM to larger electrical conductivity [57]. In the present work, the qualitative results of the dispersion tests were used to calculate the Hansen sphere for the HSAG adduct with the PyC based on dodecylamine, performing a first estimate of the Hansen solubility parameters (HSP) [58] of the adduct.…”

Section: Introductionmentioning

confidence: 99%

Facile and sustainable functionalization of graphene layers with pyrrole compounds

Barbera

Bernardi

Palazzolo

et al. 2017

Pure and Applied Chemistry

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A facile and sustainable functionalization of graphene layers was performed with pyrrole compounds (PyC) prepared through the Paal-Knorr reaction of a primary amine with 2,5-hexanedione. A good number of primary amines were used: hexanamine, dodecanamine, octadecanamine, 2-aminoacetic acid, 2-amino-1,3-propanediol, 3-(triethoxysilyl)propan-1-amine. The reactions were characterized by good yield, up to 96 %, and indeed satisfactory atom efficiency, up to 80 %. The functionalization of graphene layers was obtained by mixing PyC with a high surface area graphite and heating at a temperature range from 130 °C to 150 °C for 3 h. The yield of functionalization reaction was larger than 60 % and also up to about 90 % for the pyrrole compounds from dodecanamine and 2-amino-1,3-propanediol, respectively. The cycloaddition reaction between the graphene layers and the pyrrole compound, oxidized in two position, is proposed as working hypothesis to account for such efficient functionalization. Raman spectroscopy revealed that the structure of the graphitic substrate remained substantially unaltered, after the reaction. Stable dispersions of HSAG adducts with different PyC were prepared in solvents with different solubility parameters and HRTEM analysis showed the presence of aggregates of only few layers of graphene. Qualitative results of dispersion tests were used to calculate the Hansen sphere for the HSAG adduct with the pyrrole compound based on dodecanamine so to provide a first estimate of its Hansen solubility parameters. This work paves the way for the facile and sustainable modification of the solubility parameters of graphene layers and for the predictive assessment of their compatibility with different environments.

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“…dispersive interactions (δ D ), polar interactions (δ P ) and hydrogen bonding interactions (δ H ) [33]. The dispersive Hansen parameter, δ D has an inverse relationship with the diameter of CNTs, since the former gets decided by the extent of van der Waals forces [33]. Therefore, it seems rational to mention that δ D becomes increasingly higher from pristine MWNTs to DWNTs, and further to SWNTs.…”

Section: Study Of Hydrophilic Features Of Mixed-matrix Uf Membranesmentioning

confidence: 99%

“…The Hansen solubility parameter (HSP), being important material property to illustrate the physicochemical compatibility of CNTs gets defined through the addition of three different contributing factors, viz. dispersive interactions (δ D ), polar interactions (δ P ) and hydrogen bonding interactions (δ H ) [33]. The dispersive Hansen parameter, δ D has an inverse relationship with the diameter of CNTs, since the former gets decided by the extent of van der Waals forces [33].…”

Section: Study Of Hydrophilic Features Of Mixed-matrix Uf Membranesmentioning

confidence: 99%

High-performance mixed-matrix membranes with altered interfacial and surface chemistry through benign reinforcement of functionalized carbon nanotubes of different configurations

Kar¹,

Pal²,

Debnath³

et al. 2017

Express Polym. Lett.

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IntroductionNanotechnology, with tremendous versatility and unprecedented opportunities, has ubiquitously gained the recognition in enhancing the sustainability of membrane-based water treatment processes [1,2]. The promising synergistic effects of nano-and membrane technologies provide tangible ways to develop mixed-matrices with tunable functional features, which can make the membrane separation process more productive, energy-efficient, and environmental-friendly. Amongst the nanomaterials, the carbon nanotubes (CNTs) possess outstanding structural, mechanical and electronic properties that are exploited to develop high-performance mixed-matrix systems [3]. The importance of CNTs to the membrane scientists stems from its unique potential to result in a membrane with improved permeability [4,5] Abstract. Nanomaterials potentially minimize the inherent trade-off between productivity and selectivity of membranebased ultrafiltration (UF) process. A comparative study on the reinforcement effect of pristine carbon nanotubes (CNTs) of three different configurations, viz. single-walled (SWNT), double-walled (DWNT) and multi-walled (MWNT), and their carboxylated counterparts, onto a polysulfone (Psf) host matrix of mixed-matrix UF membranes is illustrated herein. The varying structural features of carboxylated CNTs, probed by XPS analysis, underpin the enrichment of CNTs with oxygen rich functionalities following the trend of MWNT > DWNT > SWNT. The membranes with enhanced hydrophilicity and altered electrokinetics substantiate the efficacy of facilitated reinforcement of functionalized CNTs over the pristine ones. Variations in surface topography and mechanical feature of the membranes elucidate that carboxylation influences the interfacial chemistry by enhancing the dispersion stability of MWNTs more profoundly than its configurational counterparts like SWNTs and DWNTs, and concurrently alters its distribution within the membranous matrix. The enhanced ultrafiltration performances, as achieved by twofold enhancement in solvent fluxes without compromise in the solute rejection capabilities (~89-90% toward PEG, M w : 35 kDa), confirm the potential of carboxylated CNTs in leading to development of high-performance mixed-matrix membranes.

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Influence of matching solubility parameter of polymer matrix and CNT on electrical conductivity of CNT/rubber composite

Cited by 58 publications

References 28 publications

Radio frequency plasma mediated dry functionalization of multiwall carbon nanotube

Radio frequency plasma mediated dry functionalization of multiwall carbon nanotube

Facile and sustainable functionalization of graphene layers with pyrrole compounds

High-performance mixed-matrix membranes with altered interfacial and surface chemistry through benign reinforcement of functionalized carbon nanotubes of different configurations

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