Graphene nanoplatelets

H. Wu, L. T. Drzal, Graphene nanoplatelet paper as a light-weight composite with excellent electrical and thermal conductivity and good gas barrier properties., Carbon, vol. 50,... 

Noncovalent functionalization of graphene nanoplatelets with single-stranded DNA (ssDNA) has increased the solubility of graphene to as high as 2.5 mg/1 in water... 

Seo J-M, Jeon I-Y, Baek J-B. Mechanochemically driven solid-state Diels-Alder reaction of graphite into graphene nanoplatelets. Chem Sci 2013 4 4273-7. 

Jeon I-Y, Choi H-J, Jung S-M, Seo J-M, Kim M-J, Dai L, Baek J-B. Large-Scale Production of edge-selectively functionalized graphene nanoplatelets via ball milling and their use as metal-free electrocatalysts for oxygen reduction reaction. J Am Chem Soc 2013 135 1386-93. 

PANI/exfoliated graphene nanoplatelets (GNs) composites were prepared by similar in-situ polymerization [13]. A paper-like nanocomposite flexible film was obtained by controlling vacuum filtration of an aqueous dispersion of PANI-decorated GNs as shown in Figure 6.6 [14]. 

Graphene nanoplatelet reinforced semi-crystal PEN nanocomposites have been prepared by twin-screw extrusion [51]. The graphene may act as nucleating agents but they decrease the whole crystallinity of the GN nanocomposites. 

Yang X, Xu M, Zou X, Liu X. Graphene nanoplatelet-reinforced semi-crystal poly(ary-... 

S. Chatterjee, J.W. Wang, W.S. Kuo, N.H. Tai, C. Salzmaim, W.L. Li, et al., MechcUiiccd reinforcement cUid thermcd conductivity in expcuided graphene nanoplatelets reinforced epoxy composites. Chemical Physics Letters, 531, 6-10,2012. 

Graphene nanoplatelets showed DET at both, bioanodes and cathodes using GOX and laccase, respectively. These connected bioelectrodes provided a maximum power output of 60 pW cm and 0.6 V OCP [28]. 

J. C., Lee, J.J., Shin, D. etal (2013) Direct nitrogen fixation at the edges of graphene nanoplatelets as efficient electrocatalysts for energy conversion. Sci. Rep., 3, 1-7. 

The graphene nanoplatelets acted as a nucleating agent and increased the crystallization temperature and simultaneously acted as a physical barrier, redtrcing crystallite growth of... 

Imran Jafri R, Rajalakshmi N, Ramaprabhu S (2010) Nitrogen doped graphene nanoplatelets as catalyst support for oxygen reduction reaction in proton exchange membrane fuel cell. J Mater Chem 20(34) 7114-7117... 

Acrylonitrile butadiene rubber NBR (Peibunan 28-45F) containing 28 wt % of acrylonitrile was obtained from Lanxess. Its Mooney viscosity was (MLl+4( 100 °C) 45). It was cured with sulfur in the presence of 2-mercaptobenzothiazole (MET), zinc oxide with and stearic acid. We used three types of graphene nanoplatelets with specific surface area 300 mVg (G-300), 500 mVg (G-500), and 750 mVg (G-750) fromXG Science Inc. (USA). 

Sato J, Takasu Y, Fukuda K, Sugimoto W (2011) Graphene nanoplatelets via exfoliation of platelet carbon nanofibers and its electric double layer capacitance. Chem Lett 40 44-45... 

Shao Y, Zhang S, Wang C, Me Z, Liu J, Wang Y, Lin Y (2010) Highly durable graphene nanoplatelets supported Pt nanocatalysts for oxygen reduction. J Power Sources 195 4600-4605... 

Graphene nanoplatelets less than 100 nm in length and 2 nm in thickness are dispersed in binder or matrix material such as PAN, furfuryl alcohol, phenolic formaldehyde, polyacrylonitrile, and ceUulosic polymers. Carbonization of sample slurry results in increased specific surface area from 492 to 1560 rv /g. 

Yu, A. A. Sy, and A. Davies. 2011. Graphene nanoplatelet-supported Mn02 nanoparticles for electrochemical supercapacitor. Synthetic Metals, 161, 2049-2054. 

Bionanocomposites of Regenerated Cellulose Reinforced with Halloysite Nanoclay and Graphene Nanoplatelets Characterizations and Properties... 

Intercalation of polymers in layered hosts, such as layered silicate and graphene nanoplatelets, has proven to be a successful method to prepare PLS nanocomposites the preparation methods are divided into three main groups according to the processing techniques and starting materials, which include solvent interaction process, in situ polymerization process, and melt interaction method (Sinha Ray and Okamoto 2003). 

The elongation at break values of RCG nanocomposites, however, decreased with the presence of graphene nanoplatelets. The elongation at break values decreased from 8.1 to 4.4 % with 3 wt% GNP loading in RCG nanocomposite film. This was attributed to the interaction between graphene nanoplatelets and polymer matrix, which restricts the movement of cellulose chains. The water absorption (%) of RC and RCG nanocomposites for 2 and 24 h was calculated. It was seen that the presence of graphene nanoplatelets in cellulose improve water resistance of RCG nanocomposite films. 

The water absorption of the nanocomposite films after 24 h decreased from 95 to 71 % as the GNPs content increased from 0.5 to 5 wt%. The lower water absorption of RCG nanocomposites versus that of pure RC was due to the lower water afiftnity of GNPs than that of cellulose and also strong interactions between cellulose and graphene nanoplatelets. It was deduced that the addition of GNPs decreases the water absorption of the RC films due to the presence of impermeable graphene nanoplatelets in the nanocomposites which can lower the rate of water transport in the polymer matrix. 

Fig. 8.7 Computational prediction on the effect of the diameter (left) and thickness (right) of randomly distributed graphene nanoplatelets of different aspect ratio (D/t) on the percolation threshold. Adopted from Li and Kim (2007)...

Table 8.1 Effect of geometric shape factors and aspect ratio on the percolation threshold for graphene nanoplatelets with different matrix polymers...

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