Crumpled graphene: preparation and applications

Rouby, Waleed M. A. El

doi:10.1039/c5ra10289h

Cited by 72 publications

(30 citation statements)

References 173 publications

(555 reference statements)

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“…Significantly, the glistening surface of GF (insert of Figure S1f, Supporting Information) manifests that such local microfolds of atomic thin graphene do not influence the smoothness of GFs, which favors the fine contact with a substrate in the practical thermal conducting applications. So our approach based on the molecular level of folding is essentially different from the previous ones which created crumples of a whole macroscopic material with stretching elastic substrates . As a result, our material surface is still highly smooth, whereas the previous cases are generally rough.…”

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confidence: 90%

Ultrahigh Thermal Conductive yet Superflexible Graphene Films

et al. 2017

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Electrical devices generate heat at work. The heat should be transferred away immediately by a thermal manager to keep proper functions, especially for high-frequency apparatuses. Besides high thermal conductivity (K), the thermal manager material requires good foldability for the next generation flexible electronics. Unfortunately, metals have satisfactory ductility but inferior K (≤429 W m K ), and highly thermal-conductive nonmetallic materials are generally brittle. Therefore, fabricating a foldable macroscopic material with a prominent K is still under challenge. This study solves the problem by folding atomic thin graphene into microfolds. The debris-free giant graphene sheets endow graphene film (GF) with a high K of 1940 ± 113 W m K . Simultaneously, the microfolds render GF superflexible with a high fracture elongation up to 16%, enabling it more than 6000 cycles of ultimate folding. The large-area multifunctional GFs can be easily integrated into high-power flexible devices for highly efficient thermal management.

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confidence: 90%

Ultrahigh Thermal Conductive yet Superflexible Graphene Films

et al. 2017

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“…[1][2][3][4][5][6][7] Toward macro applications, graphene oxide (GO), [8][9][10][11][12][13][14][15] a well-known solution processable precursor of graphene, has been mostly studied as a universal starting material, which overcomes the processing difficulties of graphene due to its intrinsic insolubility. The GO, which is generally obtained by solution oxidation of graphite with strong oxidizing reagents (e.g., potassium permanganate (KMnO 4 ) and concentrated sulfuric acid (H 2 SO 4 ) in a modified Hummers method) and can be further transformed into reduced graphene oxide (RGO) upon diverse reduction strategies, [16][17][18] features excellent solution processing capability as well as massive manageability and manipulation properties, thanks to the presence of a large number of epoxy and hydroxyl groups on its basal plane and carboxyl groups (-COOH)) on the peripheral interface. 19,20 As a plus, the specific functional groups (e.g., -COOH) on the GO can be further applied as versatile anchoring points to direct the assembly of diverse species with matching functional groups (e.g., inorganic nanoparticles and polymers containing amino groups that can react with -COOH groups to form amides) on the GO, toward the construction of functional hybrid materials for diverse applications.…”

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confidence: 99%

Controlled functionalization of graphene with carboxyl moieties toward multiple applications

Miao

Zhi

2016

RSC Adv.

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“…Analogously, at the nanoscale, spheres of crumpled graphene, the epitome of a thin sheet, are being explored for innovative energy storage applications ( Fig. 1(b)) [9,10].As a second illustration of the scale-invariance in plates, in Figs. 1(c) and 1(d), we present two examples of kirigami, for paper and graphene sheets, respectively; a variation of origami that involves shape forming but allowing cutting [11].…”

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confidence: 99%

A Perspective on the Revival of Structural (In)Stability With Novel Opportunities for Function: From Buckliphobia to Buckliphilia

Reis

2015

Journal of Applied Mechanics

158

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Buckling of slender structures is traditionally regarded as a first route toward failure. Here, we provide an alternative perspective on a burgeoning movement where mechanical instabilities are exploited to devise new classes of functional mechanisms that make use of the geometrically nonlinear behavior of their postbuckling regimes. Selected examples are highlighted across length-scales to illustrate some of the exciting opportunities that lie ahead. [DOI: 10.1115/1.4031456] IntroductionSlender structural elements (e.g., rods, plates and shells) under compression are ubiquitously subjected to mechanical instabilities. In 1744, Euler [1] laid the foundation for the formal analysis of structural stability; a field that has matured to become paramount in engineering design and one of the pillars in the history of mechanics [2]. A modern and detailed perspective on the stability of structures is found in the seminal book by Ba zant and Cedolin [3]. Across length-scales, buckling has traditionally been regarded as a first route toward failure and can lead to catastrophic collapse [4]; an approach that can be succinctly referred to as Buckliphobia. By contrast, Buckliphilia is a more recent and burgeoning trend that is changing the above paradigm. Mechanical instabilities of slender structures are therefore envisioned as opportunities for novel modes of functionality that are to be predictively understood in order to then be exploited.In these efforts of adopting Buckliphilia, there is a need to rationalize the complex configurations that arise in the postbuckling regime, far-from-threshold. The large displacements and rotations permissible by slender structures can yield nontrivial and nonnegligible geometric nonlinearities, even if their material properties remain linear. Furthermore, this strong rooting of the postbuckling behavior on geometry results in general and universal modes of deformation; albeit with threshold or onsets that are scale-or material-dependent. To avoid overstatement, it is important to note that viscoelasticity, plasticity, fracture, and other phenomena can introduce additional time-and length-scales that may compromise the geometric universality of the buckling modes. In many problems involving the large deformation of thin structures, however, the strains at the material level are small enough, such that these effects are secondary and a linear elastic constitutive description suffices.Qualifying a structure as slender is a statement on aspect ratio rather than length-scale, which added to the fact that elasticity is a scale-free theory, ensures that functional mechanisms based on the instability of slender structures can be instantiated over a wide range of length-scales. In Fig. 1, we represent three representative examples that illustrate this scale invariance. First, the crumpling of paper [5] (Fig. 1(a)) has been regarded by the nonlinear physics community as a canonical problem, at the centimeter scale, for Precision desktop experiment to study the buckling of a thin rod injected int...

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Crumpled graphene: preparation and applications

Cited by 72 publications

References 173 publications

Ultrahigh Thermal Conductive yet Superflexible Graphene Films

Ultrahigh Thermal Conductive yet Superflexible Graphene Films

Controlled functionalization of graphene with carboxyl moieties toward multiple applications

A Perspective on the Revival of Structural (In)Stability With Novel Opportunities for Function: From Buckliphobia to Buckliphilia

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