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Graphene oxide (GO) is the most widely used precursor for graphene materials because of its excellent processibility and unique solution chemistry. In a GO solution, the solvent provides a specific chemical environment to affect the conversion of GO into graphene materials. Herein, we report that organic solvents are good media for producing graphene materials with improved properties. Particularly,...
Organic solvent nanofiltration (OSN) membranes with excellent and tuneable molecular separation performances are important in pharmaceutical industry. Here, we report reduced graphene oxide (rGO) membranes intercalated with self-assembled 5, 10, 15, 20-tetrakis (1-methyl-4-pyridinio) porphyrin (TMPyP) molecules for this purpose. These membranes showed strong tolerances to water and various organic...
Graphene oxide films are excellent structural and functional materials for their outstanding performance. Recent measurements reported widely scattered mechanical properties, which have been attributed to the difference in the chemistry and complex microstructures that rely on the fabrication process. In this work, we present an experimental study showing that the procedure of mechanical characterization...
Graphene oxide (GO) sheets with desired sizes and narrow size distribution were synthesized via a modified Hummers method by using sieved graphite flakes as the starting materials. This method outweighs previous post-synthesis fractionation methods in efficiency and scalability; thus it is more promising for large-scale synthesis of size-controlled GO. The as-prepared GO suspensions exhibited size-dependent...
A novel P–N containing intumescent flame retardant, 2-cyclic pentaerythritoloctahydrogen tetraphosphate-4,6-benzene sulfonic acid sodium ammion-triazine (CTOB) was synthesized and used as an additive in intumescent flame retardant composites containing organic montmorillonite (OMMT) and Nylon 6. The thermal stability and flammability properties of Nylon 6, CTOB, OMMT and their composites were investigated...
The ultrafast spin switching on double-magnetic-center endohedral fullerenes Co2@C60 under uniaxial tensile strain is investigated through ab initio calculations. The applied strain along the Co–Co bond plays an important role in the spin density distribution, especially for the low-lying magnetic states, and thus dominates the spin-switching processes. It is shown that the achieved local spin switching...
Activated carbons (ACs) were prepared from peanut shells by KOH activation under microwave heating and were used as electrode materials for electrochemical capacitors (ECs). The pore structure of the ACs was characterized by nitrogen adsorption and the electrochemical performance by galvanostatic charge–discharge and cyclic voltammetry. Results show that the ACs’ specific surface area, total pore...
Graphite flakes with sizes in the range of 3–20μm can be completely converted into single-layer graphene oxide (GO) with a high yield of 171±4% via an improved Hummers method. This yield is much higher than that (110±3%) from larger graphite flakes with sizes of 10–100μm. The structures, qualities and size distributions of the GO sheets prepared from both graphite precursors are nearly identical....
An improved Hummers method without using NaNO 3 can produce graphene oxide nearly the same to that prepared by conventional Hummers method. This modification does not decrease the yield of product, eliminating the evolution of NO 2 /N 2 O 4 toxic gasses and simplifying the disposal of waste water because of the inexistence of Na + and NO 3− ions...
We report the preparation of mechanically strong and ductile poly(vinyl alcohol)/graphene oxide (GO) composite films with a layered structure simply by vacuum filtration. The Young’s modulus and tensile yield strength of the composite film containing 3wt.% GO were measured to be 4.8GPa and 110±7MPa, respectively. Furthermore, it is flexible and exhibits a large elongation at break (36±4%). The high...
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