Graphene-like BN/gelatin nanobiocomposites for gas barrier applications

Biscarat, Jennifer; Bechelany, Mikhaël; Pochat-Bohatier, C.; Miele, Philippe

doi:10.1039/c4nr05268d

Cited by 62 publications

(70 citation statements)

References 35 publications

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“…Nevertheless, LPE has been applied to a wide range of 2D materials including graphene, 19,31,32 BN, 3 TMDs, 20,33 TMOs, 34,35 GaS, 36 phosphorene 37, 38 and MXenes. 45 These structures have been used in a wide range of applications from barrier composites 46,47 to battery electrodes 48 to photodetectors. 26,40 The resultant dispersions can very easily be processed into nanostructured materials by a range of methods such as spray casting, 41 inkjet printing, 42,43 gravure printing 44 and freeze drying.…”

Section: Introductionmentioning

confidence: 99%

Production of Ni(OH)₂nanosheets by liquid phase exfoliation: from optical properties to electrochemical applications

et al. 2016

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^ These authors contributed equally ABSTRACT: Here we demonstrate that liquid phase exfoliation can be used to convert layered crystals of nickel hydroxide into Ni(OH) 2 nanosheets in relatively large quantities and without the need for ion intercalation. While other procedures require harsh synthesis conditions and multiple reaction steps, this method involves ultrasonication of commercially available powders in aqueous surfactant solutions and so is relatively mild and potentially scalable. Such mild exfoliation is possible because the surface energy of Ni(OH) 2 , as measured by inverse gas chromatography, is relatively low at ~70 mJ/m 2 , similar to other layered materials. TEM, AFM, XPS and Raman spectroscopy show the exfoliated nanosheets to be relatively thin (mean ~10 monolayers thick) and of good quality. Size selection by liquid cascade centrifugation allowed the production of samples with mean nanosheet lengths ranging from 55 to 195 nm. Optical measurements on dispersions showed the optical absorption coefficient spectra to be relatively invariant with nanosheet size while the scattering coefficient spectra varied strongly with size. The resultant size-dependence allows the extinction spectra to be used to estimate nanosheet size as well as concentration. We used the exfoliated nanosheets to prepare thin film electrodes for use in supercapacitors and as oxygen evolution catalysts. While the resultant capacitance was reasonably high at ~1200 F/cm 3 (20 mV/s), the catalytic performance was exceptional with currents of 10 mA/cm 2 observed at overpotentials as low as 297 mV, close to the state of the art.Recently, an alternative approach, 19, 24 called liquid phase exfoliation (LPE), 25 has been developed to exfoliate uncharged layered crystals (i.e. those without interlayer ions) to give liquid-dispersed nanosheets. This method involves the production of few-layer nanosheets by shearing 26 or ultrasonication 20 of layered crystals in appropriate stabilising liquids (i.e. certain solvents 27 and surfactant 28 or polymer solutions 29 ). In each case, interactions between the stabilising liquid and the nanosheet surface reduce the net exfoliation energy and stabilise the nanosheets against aggregation. 24 The resultant 23 standard Ni(OH) 2 dispersion (C i = 20gL -1 , C surf = 9g L -1 , t sonic = 4h, f = 1.5krpm, t cf = 120min). C) AFM data for nanosheet length plotted versus nanosheet thickness for a standard Ni(OH) 2 dispersion. The dashed line represents L=10N. Inset: Sample AFM image. D) Histogram of nanosheet thicknesses, N, as measured by AFM. The line represents a lognormal distribution. Inset: Magnified image of low N portion of histogram. E) Optical extinction, absorption, and scattering spectra of Ni(OH) 2 in surfactant solution. Inset: magnified view showing absorption spectrum. F) Final Ni(OH) 2 nanosheet concentration plotted against surfactant concentration showing a peak at ~10g L -1 of sodium cholate. The dispersions in 1F were prepared with initial powder concentration C i = 10g L -1 , t soni...

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Section: Introductionmentioning

confidence: 99%

Production of Ni(OH)₂nanosheets by liquid phase exfoliation: from optical properties to electrochemical applications

et al. 2016

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“…[7] PVDF is currently used for technical applications including protective coatings for the chemical industry and piping, where both chemical resistance and low friction responses are highly desirable properties. [14,15] The incorporation of NPs is typically hindered by agglomeration mechanisms and macro-defects formation at the polymerparticle interface, [16] leading to premature degradation of the materials and often limited long term performance. To date, only a hand-full of papers have been dedicated to investigating the changes in mechanical properties of PVDF upon inclusion of nano-fillers, which is primarily due to the difficulty to control the incorporation of largely hydrophilic NPs across such low surface energy material.…”

Section: Introductionmentioning

confidence: 99%

Zinc Oxide PVDF Nano‐Composites–Tuning Interfaces toward Enhanced Mechanical Properties and UV Protection

et al. 2016

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This work shows that the mechanical properties and UV-resistance of poly(vinylidene fluoride) (PVDF) materials can be significantly improved upon dispersion of zinc oxide (ZnO) nano-particles. Zinc Oxide PVDF Nano-Composites are first produced through melt-compounding and are subsequently converted into thin films or into injection molded samples. The dispersion of the ZnO into PVDF is found to be relatively homogeneous throughout all samples. The inclusion of the ZnO is found to largely improve the tensile and flexural modulus by up to 20 and 60%, respectively. At ZnO contents exceeding 15 vol%, the UV transmittance of the films is completely obstructed, demonstrating the UV-shielding action of the nanoparticles. The collective results strongly suggest that these nano-composites could find potential applications where improved strength and both visible and UV-resistance are needed.

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“…38,[43][44][45] One of the most important applications of 2D fillers in polymer-based composites are as barrier materials to reduce the permeability of the material to gases. 53 Recently, it has been reported that solution processing can be used to mix h-BN with a range of materials, including gelatin, cellulose, chitosan and soy protein, [54][55][56][57] resulting in improvements in their barrier properties. 46 Due to their low cost, high aspect ratio and low toxicity, nanoclays have been well-studied as barrier-enhancing fillers for polymers.…”

Section: Introductionmentioning

confidence: 99%

Boron nitride nanosheets as barrier enhancing fillers in melt processed composites

et al. 2015

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In this work we have used melt-processing to mix liquid-exfoliated boron-nitride nanosheets with PET to produce composites for gas barrier applications. Sonication of h-BN powder, followed by centrifugation-based size-selection, was used to prepare suspensions of nanosheets with aspect ratio >1000. The solvent was removed to give a weakly aggregated powder which could easily be mixed into PET, giving a composite containing well-dispersed nanosheets. These composites showed very good barrier performance with oxygen permeability reductions of 42% by adding just 0.017 vol% nanosheets. At low loading levels the composites were almost completely transparent. At higher loading levels, while some haze was introduced, the permeability fell by ∼70% on addition of 3 vol% nanosheets.

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Graphene-like BN/gelatin nanobiocomposites for gas barrier applications

Cited by 62 publications

References 35 publications

Production of Ni(OH)₂nanosheets by liquid phase exfoliation: from optical properties to electrochemical applications

Production of Ni(OH)₂nanosheets by liquid phase exfoliation: from optical properties to electrochemical applications

Zinc Oxide PVDF Nano‐Composites–Tuning Interfaces toward Enhanced Mechanical Properties and UV Protection

Boron nitride nanosheets as barrier enhancing fillers in melt processed composites

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Graphene-like BN/gelatin nanobiocomposites for gas barrier applications

Cited by 62 publications

References 35 publications

Production of Ni(OH)2nanosheets by liquid phase exfoliation: from optical properties to electrochemical applications

Production of Ni(OH)2nanosheets by liquid phase exfoliation: from optical properties to electrochemical applications

Zinc Oxide PVDF Nano‐Composites–Tuning Interfaces toward Enhanced Mechanical Properties and UV Protection

Boron nitride nanosheets as barrier enhancing fillers in melt processed composites

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Production of Ni(OH)₂nanosheets by liquid phase exfoliation: from optical properties to electrochemical applications

Production of Ni(OH)₂nanosheets by liquid phase exfoliation: from optical properties to electrochemical applications