26
Nov
Difference between hummers and modified hummers method Get the answers you need now. Different samples of graphite oxide GrO were prepared by modification of the Improved Hummers Method reported in the literature.
Jan 14 2021.
Difference between hummers and modified hummers method. Difference between hummers and modified hummers method Get the answers you need now. Graphene oxide was prepared by both modified and improved Hummers protocols. It was found that the materials obtained in both cases exhibit nearly similar physico-chemical characteristics except a little bit difference in crystalline nature.
The former method produced somewhat ordered structure of GO while the latter produced amorphous materials. Graphene oxide preparation by using modified Hummers method Graphene oxide GO was prepared from graphite flakes by using modified Hummers method. The step by step synthesis is as follows.
12 g of Graphite flakes and 2 g of NaNO 3 and 50 ml of H 2 SO 4 98 were mixed in a 1000 ml volumetric flask kept under at ice bath. GO was obtained from graphite flakes by using modified hummers method in which different from conventional hummers method. In this method the experiment was synthesized without sodium nitrate NaNO 3 and ice bath but carried out at room temperature.
Prepared GO powders were then dissolved into different solvents namely acetone and ethanol. A Comparative Analysis of Structural and Electrochemical Properties of Graphene Oxide GO and Reduced Graphene Oxide rGO Synthesized by Using Hummers and Modified Hummers Method. Jan 14 2021.
I have tried modified hummers method for the synthesis of graphene oxide by adding Graphite powder and NaNO 3 in H 2 SO 4. Based on these work Hummers and Offeman 15 developed an alternate oxidation method in 1958 often called Hummers method in which NaNO 3. The most important and widely used method for the synthesis of graphite oxide is the one developed by Hummers and Offeman in 1958 Hummers method 28 29.
This method includes all former developments but with key improvements. It consists of carrying out a reaction of graphite powder with KMnO 4 and NaNO 3 in concentrated H 2 SO 4. Concentration of Sulphuric Acid.
Concentration of Sulphuric Acid is most important in Hummers method. Higher the concentration of Sulphuric Acid higher the chances of complete exfoliation of Graphite into Graphene Oxide. But also very high chances of unwanted accident.
The attempts have been made to synthesize GO having few layers by using a modified Hummers method where the amount of NaNO 3 has been decreased and the amount of KMnO 4 is increased. The reaction has been performed in a 91 by volume mixture of H 2SO 4H 3PO 4. This modification is successful in in-.
This improved method provides a greater amt. Of hydrophilic oxidized graphene material as compared to Hummers method or Hummers method with addnl. Moreover even though the GO produced by our method is more oxidized than that prepd.
By Hummers method when both are reduced in the same chamber with hydrazine chem. Converted graphene CCG produced from this new method is. The above video shows a step by step synthesis procedure of GO.
Graphene oxide GO was successfully prepared by oxidizing purified natural flake graphite NFG by a modified Hummers method. GO was later thermally reduced to synthesize reduced GO rGO. The GO synthesized by the modified Hummers method was found to consist of stacks of GO sheets.
INFLUENCE OF DIFFERENT IMPROVED HUMMERS METHOD MODIFICATIONS ON THE CHARACTERISTICS OF GRAPHITE OXIDE IN ORDER TO MAKE A MORE EASILY SCALABLE METHOD Maria del Prado Lavin Lopez Amaya Romero Jesus Manuel Garrido Luz Sanchez-Silva and José Luis Valverde Ind. Several modifications to the Hummers method have been described. For example the Hoffmans method uses chlorate in concentrated HNO 3 and KMnO 4 and the Brodies method employs HNO 3 and KClO 3.
These methods have disadvantages such as very long reaction times and they also have dangerous reaction conditions. Different samples of graphite oxide GrO were prepared by modification of the Improved Hummers Method reported in the literature. Graphite was used as the raw material and KMnO4 and H2SO4 were used as chemical reagents.
GrO samples were analyzed by Raman spectroscopy SEM TEM elemental analysis X-ray diffraction N2 adsorptiondesorption and. The GTO prepared by this method was named as HGTO. GTO was also prepared by the following method mod-ified on the basis of the Hummers method.
After the same reaction at low temperature as in Hummers method the mixture was heated up to 60 C and held for 30 min then 230 mL distilled water was added into the mixture that was. Oxidation of the graphite was more effective with the modified Hummers method than with Brodies method CO of 18 vs 29 as determined by XPS the former generated a lower residual oxygen content after thermal exfoliationreduction and a better reconstruction of. Hummers and Offeman also used a method that involved extremely strong oxidizers.
Potassium permanganate sodium nitrate and sulfuric acid. However their method used fewer reagents and had no water. Allowing for both a speedier and safer synthesis as well as producing a product with a slightly higher ratio of oxidation at 21 carbon atoms with every 1 oxygen atoms.