Reducing the amount of solvent destabilizes the graphene dispersion and leads to the Processable aqueous dispersions of graphene nanosheets. Nat.  synthesized organophilic graphene nanosheets by modifying GO with .. G.G. Processable aqueous dispersions of graphene nanosheets. After the diffusion dialysis process step, the aqueous fullerenol solution with a pH .. Wallace, “Processable aqueous dispersions of graphene nanosheets,” Nat.
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ACS eBooks; C&EN Global Enterprise . Processable Aqueous Dispersions of Graphene Stabilized by Graphene . Direct Observation, Molecular Structure, and Location of Oxidation Debris on Graphene Oxide Nanosheets. Abstract Graphene sheets offer extraordinary electronic, thermal and mechanical properties and are expected to find a variety of applications. A prerequisite for. Processable aqueous dispersions of graphene nanosheets. DAN LI1, MARC B. MU¨ LLER1, SCOTT GILJE2,. RICHARD B. KANER2 AND.
Reduced Graphene Oxide Article pubs. Compared with conventional main-chain polybenzoxazoles, whose processability and dielectric performance are strictly limited by the conjugated benzoxazole groups on the backbone, improved solubility in dimethylformamide and dielectric constant 4. In addition, improved dispersion of conductive graphene nanosheets was achieved by a surface-initiated atom transfer radical polymerization ATRP of the N- 2-hydroxyphenyl methacrylamide oHPMAA , the precursor of 2-isopropenylbenzoxazole from reduced graphene oxide RGO. The nanocomposites of functionalized graphene and P 2-IBO possess a dielectric constant of 8. Poly N- 2hydroxyphenyl methacrylamide P o-HPMAA , polymerized from the precursor of 2-IBO, was considered to be well compatible with its dehydrated cyclic counterpart due to the similarity in chemical structure and composition.
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Journal Li, D. Processable aqueous dispersions of graphene nanosheets - Nature Nanotechnology In-text: Li et al.
Processable aqueous dispersions of graphene nanosheets. For example, it was easy to crease of the graphene with great dimension, which had a higher friction factor than the graphene with smaller dimensions. In some circumstances, factors were closely connected and conflicted with each other.
Furthermore, the treatment of GO with ODA in previous studies was usually under drastic conditions, i. Nevertheless, we expected to use a simple and high—efficiency process to produce graphene.
The dispersing performance and thermal properties were evaluated respectively to further comprehend and verify the evolution. Based on the study, we were able to obtain the desired RGO and realize its practical application by controlling conditions. Significantly, we identified the conditions to produce RGO with both high reductive degree and long—term dispersion stability. Materials and Methods 2. Beijing, China. To be treated by modifier, 0.
Then, 0. The prepared reduced graphene oxide RGO was washed 10 times by absolute ethyl alcohol together with suction filtration. The ORGO film was obtained by filtration using a nylon membrane 0.
The as—prepared reduced graphene oxide was characterized by atomic force microscopy AFM to show the particle size of the microscopic particle. Raman spectra were recorded using a Renishaw invia with a laser wavelength of Results 3.
Instead, the characteristic peaks of long—chain alkyls and amines appeared. GO treated under mild conditions Figure 1 b—f had similar characteristic peaks, i.
The characterized peak at these bands was totally different from multi-peak in spectrum of ODA which demonstrated the reaction between graphene oxide and ODA. This result was also confirmed by the XPS analysis and demonstrated the successful chemical reduction and surface grafting by ODA.
Thus, the contact angle increased over as reported in previous study [ 20 ], the contact angle of GO was lower than Considering that the reduction mechanism of hydrazine hydrate reduced graphene oxide in a former study [ 25 ] and the characteristics of primary amine groups, we speculated that the reduction occurred through two probable routes shown in Scheme 1.
In general, the reduction reaction was originated from nucleophilic addition between amine and epoxy in both the two routes. In a typical nucleophilic addition reaction, the amine group acted as a nucleophile and attacked the carbon atom in epoxy groups, grafting the long hydrocarbon chain of the ODA onto GO sheets.