High-yield exfoliation of graphite in acrylate polymers: A stable few-layer graphene nanofluid with enhanced thermal conductivity

Sun, Zhenyu; Pöller, Sascha; Huang, Xing; Taetz, Christoph; Ebbinghaus, Petra; Masa, Justus; Erbe, Andreas; Kilzer, Andreas; Schuhmann, Wolfgang; Mühler, Martin

doi:10.1016/j.carbon.2013.07.063

Cited by 73 publications

(52 citation statements)

References 25 publications

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“…As observed in the fast Fourier transform (FFT, inset d) of the image, only intense (1100) dots were seen, indicating of a few-layer (may be monolayer) s-BN. 20 3-few-layer-stacked s-BN sheets were also found in Figure 1d and other few-layers s-BN were showed in Figure S 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 9 1.5 wt.% s-BN, the TC of PSG20-B1.5 reached up to 0.662 W·m -1 K -1 , significantly enhanced by 38% relate to PSG20 and 327% to pure PS. The results showed that s-BN had a strong synergistic effect with s-GH for improving T...…”

Section: Methodsmentioning

confidence: 97%

Thermal Conductive and Mechanical Properties of Polymeric Composites Based on Solution-Exfoliated Boron Nitride and Graphene Nanosheets: A Morphology-Promoted Synergistic Effect

Cui

Ding

Zhuang

et al. 2015

ACS Appl. Mater. Interfaces

233

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In this work, we reported a synergistic effect of boron nitride (BN) with graphene nanosheets on the enhancement of thermal conductive and mechanical properties of polymeric composites. Here, few layered BN (s-BN) and graphene (s-GH) were used and obtained by liquid exfoliation method. The polystyrene (PS) and polyamide 6 (PA) composites were obtained via solution blending method and subsequently hot-pressing. The experimental results suggested that the thermal conductivity (TC) of the PS and PA composites increases with additional introduction of s-BN. For example, compared with the composites containing 20 wt % s-GH, additional introduction of only 1.5 wt % s-BN could increase the TC up to 38 and 34% in polystyrene (PS) and polyamide 6 (PA) matrix, respectively. Meanwhile, the mechanical properties of the composites were synchronously enhanced. It was found that s-BN filled in the interspaces of s-GH sheets and formed s-BN/s-GH stacked structure, which were helpful for the synchronously improving TC and mechanical properties of the polymeric materials.

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Section: Methodsmentioning

confidence: 97%

Thermal Conductive and Mechanical Properties of Polymeric Composites Based on Solution-Exfoliated Boron Nitride and Graphene Nanosheets: A Morphology-Promoted Synergistic Effect

Cui

Ding

Zhuang

et al. 2015

ACS Appl. Mater. Interfaces

233

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“…They are re-ferred to as "nanosheets", in which "nano" refers to the magnitude of the thickness. [17] The nanosheets can be noncovalently stabilized against reaggregation by interaction with a variety of solvents, [18][19][20][21] surfactants, [22][23][24][25] polymers, [26,27] or aromatic pp-stacking molecules. [28][29][30] This top-down approach using low cost, readily available graphite is simple, easily scalable, and also allows one to introduce graphene into various processes, such as blending, casting, or functionalization.…”

Section: Introductionmentioning

confidence: 99%

High‐Concentration Graphene Dispersions with Minimal Stabilizer: A Scaffold for Enzyme Immobilization for Glucose Oxidation

Sun

Vivekananthan

Guschin

et al. 2014

Chemistry A European J

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Modified acrylate polymers are able to effectively exfoliate and stabilize pristine graphene nanosheets in aqueous media. Starting with pre-exfoliated graphite greatly promotes the exfoliation level. The graphene concentration is significantly increased up to 11 mg mL(-1) by vacuum evaporation of the solvent from the dispersions under ambient temperature. TEM shows that 75 % of the flakes have fewer than five layers with about 18 % of the flakes consisting of monolayers. Importantly, a successive centrifugation and redispersion strategy is developed to enable the formation of dispersions with exceptionally high graphene-to-stabilizer ratio. Characterization by high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and Raman spectroscopy shows the flakes to be of high quality with very low levels of defects. These dispersions can act as a scaffold for the immobilization of enzymes applied, for example, in glucose oxidation. The electrochemical current density was significantly enhanced to be approximately six times higher than an electrode in the absence of graphene, thus showing potential applications in enzymatic biofuel cells.

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“…The polyaniline functionalized graphene was added into the PVDF matrix, and ε ′ = 264 with a dielectric loss of 1.1 at 100 Hz was obtained in 5 wt% composite, which was attributed to the synergistic effect under uniform dispersion . Nevertheless, the presence of oxygen‐containing groups in rGO induces the deterioration of electrical property and thermal conductivity compared with graphene . Also, the preparation of GO usually requires hazardous reagents, which is accompanied by the safety issues and environmental pollutions .…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the presence of oxygen‐containing groups in rGO induces the deterioration of electrical property and thermal conductivity compared with graphene . Also, the preparation of GO usually requires hazardous reagents, which is accompanied by the safety issues and environmental pollutions . Furthermore, the pristine graphene in a polymer matrix tends to be aggregated due to the van der Waals force of π—π stacking.…”

Section: Introductionmentioning

confidence: 99%

High Energy Density in Poly(Vinylidene Fluoride‐Chlorotrifluoroethylene) Nanocomposite with Oriented Graphene Exfoliated with Assistance of Fluoro Hyperbranched Copolymer

Zhang

Zhu

et al. 2019

Energy Tech

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Although a polymer film capacitor releases a huge power density in pulse time, its electrical capability is limited by the low energy density for the embedded hybrid device. It is still a challenge to increase the energy density and retain high charge–discharge efficiency of the polymer film. High dielectric properties and high energy density are obtained in the uniaxial stretching poly(vinylidene fluoride‐chlorotrifluoroethylene) (P(VDF‐CTFE)) nanocomposite incorporated with few‐layer graphene, which is exfoliated with the assistance of a fluoro hyperbranched polyethylene‐graft‐poly(trifluoroethyl methacrylate) (HBPE‐g‐PTFEMA) copolymer via CH—π noncovalent interactions. The graphene/P(VDF‐CTFE) nanocomposite film is prepared via solution casting, and then, the in‐plane orientation of nanosheets is accomplished by uniaxial deformation. The relative content of the β phase reaches 96.0% in 0.8 vol% nanocomposite due to the combination of improved compatibility and the alignment of macromolecular chains. The energy density of a 0.1 vol% graphene/P(VDF‐CTFE) film achieves 9.5 J cm−3 as E = 400 MV m−1, which is attributed to the large‐content electroactive phase and interfacial polarization. The P(VDF‐CTFE) nanocomposite incorporated with aligned graphene exhibits a promising energy storage capability, which indicates that the orientation of nanosheets is an effective solution to enhance the energy density of the polymer film with large charge–discharge efficiency.

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High-yield exfoliation of graphite in acrylate polymers: A stable few-layer graphene nanofluid with enhanced thermal conductivity

Cited by 73 publications

References 25 publications

Thermal Conductive and Mechanical Properties of Polymeric Composites Based on Solution-Exfoliated Boron Nitride and Graphene Nanosheets: A Morphology-Promoted Synergistic Effect

Thermal Conductive and Mechanical Properties of Polymeric Composites Based on Solution-Exfoliated Boron Nitride and Graphene Nanosheets: A Morphology-Promoted Synergistic Effect

High‐Concentration Graphene Dispersions with Minimal Stabilizer: A Scaffold for Enzyme Immobilization for Glucose Oxidation

High Energy Density in Poly(Vinylidene Fluoride‐Chlorotrifluoroethylene) Nanocomposite with Oriented Graphene Exfoliated with Assistance of Fluoro Hyperbranched Copolymer

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