Energetic graphene oxide: Challenges and opportunities

Krishnan, Deepti; Kim, Franklin; Luo, Jiayan; Cruz-Silva, Rodolfo; Cote, Laura J.; Jang, Hee Dong; Huang, Jiaxing

doi:10.1016/j.nantod.2012.02.003

Cited by 295 publications

(204 citation statements)

References 77 publications

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“…Considering the negative effects of surfactants e.g. is detrimental to the inherent conductive properties of fillers [30], in this work, surface treatment of MGO using surfactants was believed unnecessary. Overall, with these strategies 2 wt% MGO surpassed percolation threshold (falls within 1~2 wt%) and achieved a maximum thermal conductivity enhancement of epoxy (2.03 times that of the epoxy).…”

Section: Improving the Thermal Conductivity Ofmentioning

confidence: 99%

Targeted kinetic strategy for improving the thermal conductivity of epoxy composite containing percolating multi-layer graphene oxide chains

Zhou

Koga

Nogi

et al. 2015

Express Polym. Lett.

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Abstract. By adding 2 wt% multi-layer graphene oxide (MGO) to an epoxy resin, the thermal conductivity of the composite reached a maximum, 2.03 times that of the epoxy. The presence of 2 wt%MGO percolating chains leads to an unprecedentedly sharp rise in energy barrier at final curing stage, but an increased epoxy curing degree (! IR ) is observed; however, this ! IR difference nearly disappears after aging or thermal annealing. These results suggest that the steep concentration gradient of -OH, originated from the 2 wt%MGO percolating chains, exerts the vital driving force on the residual isolated/ trapped epoxy to conquer barrier for epoxy-MGO reaction. A modified Shrinking Core Model customized for the special layered-structure of MGO sheet was proposed to understand the resistance variation during the intercalative epoxy-MGO reaction. It shows that the promoted intercalative crosslinking is highly desirable for further improving the thermal conductivity of the composite, but it meets with increased resistance. Guided by the kinetic studies, targeted optimization on the cure processing strategy was accordingly proposed to promote the intercalative crosslinking, a thermal conductivity, 2.96 times that of the epoxy, was got with only a small amount (30°C) increase of the post-heating temperature.

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Section: Improving the Thermal Conductivity Ofmentioning

confidence: 99%

Targeted kinetic strategy for improving the thermal conductivity of epoxy composite containing percolating multi-layer graphene oxide chains

Zhou

Koga

Nogi

et al. 2015

Express Polym. Lett.

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“…19 In the pursuit of rationally designed lyotropic LC GO dispersions in various organic solvents, we dispersed ultra-large GO sheets in a number of common solvents including: water, N-Ndimethylformamide (DMF), N-Cyclohexyl-2-pyrrolidone (CHP), Tetrahydrofuran (THF),…”

Section: Formation Of Lc Go In Various Organic Solventsmentioning

confidence: 99%

Organic Solvent-Based Graphene Oxide Liquid Crystals: A Facile Route toward the Next Generation of Self-Assembled Layer-by-Layer Multifunctional 3D Architectures

et al. 2013

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. (2013). Organic solventbased graphene oxide liquid crystals: A facile route toward the next generation of self-assembled layer-by-layer multifunctional 3D architectures. ACS Nano, 7 (5), 3981-3990.Organic solvent-based graphene oxide liquid crystals: A facile route toward the next generation of self-assembled layer-by-layer multifunctional 3D architectures AbstractWe introduce soft self-assembly of ultralarge liquid crystalline (LC) graphene oxide (GO) sheets in a wide range of organic solvents overcoming the practical limitations imposed on LC GO processing in water. This expands the number of known solvents which can support amphiphilic self-assembly to ethanol, acetone, tetrahydrofuran, N-dimethylformamide, N-cyclohexyl-2-pyrrolidone, and a number of other organic solvents, many of which were not known to afford solvophobic self-assembly prior to this report. The LC behavior of the as-prepared GO sheets in organic solvents has enabled us to disperse and organize substantial amounts of aggregate-free single-walled carbon nanotubes (SWNTs, up to 10 wt %) without compromise in LC properties. The as-prepared LC GO-SWNT dispersions were employed to achieve self-assembled layer-bylayer multifunctional 3D hybrid architectures comprising SWNTs and GO with unrivalled superior mechanical properties (Young's modulus in excess of 50 GPa and tensile strength of more than 500 MPa). 2013 American Chemical Society.

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“…High ionic conductivity in graphene and graphene oxide-based multilayer thin films has also been confirmed by others 18,19 . However, graphene oxide is thermally unstable 20,21 and can start to deoxygenate and lose its lamellar ordering before 200°C. This greatly limits the use of graphene oxide-based lamellar membranes.…”

mentioning

confidence: 99%

Self-assembled two-dimensional nanofluidic proton channels with high thermal stability

et al. 2015

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Exfoliated two-dimensional (2D) sheets can readily stack to form flexible, free-standing films with lamellar microstructure. The interlayer spaces in such lamellar films form a percolated network of molecularly sized, 2D nanochannels that could be used to regulate molecular transport. Here we report self-assembled clay-based 2D nanofluidic channels with surface charge-governed proton conductivity. Proton conductivity of these 2D channels exceeds that of acid solution for concentrations up to 0.1 M, and remains stable as the reservoir concentration is varied by orders of magnitude. Proton transport occurs through a Grotthuss mechanism, with activation energy and mobility of 0.19 eV and 1.2 Â 10 À 3 cm 2 V À 1 s À 1 , respectively. Vermiculite nanochannels exhibit extraordinary thermal stability, maintaining their proton conduction functions even after annealing at 500°C in air. The ease of constructing massive arrays of stable 2D nanochannels without lithography should prove useful to the study of confined ionic transport, and will enable new ionic device designs.

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Energetic graphene oxide: Challenges and opportunities

Cited by 295 publications

References 77 publications

Targeted kinetic strategy for improving the thermal conductivity of epoxy composite containing percolating multi-layer graphene oxide chains

Targeted kinetic strategy for improving the thermal conductivity of epoxy composite containing percolating multi-layer graphene oxide chains

Organic Solvent-Based Graphene Oxide Liquid Crystals: A Facile Route toward the Next Generation of Self-Assembled Layer-by-Layer Multifunctional 3D Architectures

Self-assembled two-dimensional nanofluidic proton channels with high thermal stability

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