Novel Method of Graphite Exfoliation

MRS Advances ◽  
2016 ◽  
Vol 1 (19) ◽  
pp. 1395-1400
Author(s):  
Uladzimir Novikau ◽  
Ihar Razanau ◽  
Sviatlana Filipovich
Keyword(s):  
Reduction Method ◽  
Intercalation Compound ◽  
Exfoliated Graphite ◽  
Temperature Oxidation ◽  
Graphite Exfoliation ◽  
Oxidation Reduction ◽  
Graphite Intercalation ◽  
Experimental Parameters ◽  
Novel Method ◽  
Ammonia Medium

ABSTRACTThe paper describes a novel method of exfoliated graphite synthesis. The method includes synthesis of graphite intercalation compound in liquid ammonia medium and subsequent intercalate decomposition with graphite exfoliation. Influence of the experimental parameters on the morphology and structure of the exfoliated graphite is shown. Comparison of the developed exfoliation method to the high-temperature oxidation-reduction method used in industrial scale nowadays is presented. A number of application areas for the synthesized exfoliated graphite are described.

Preparation and Characterization of Graphene by Oxidation-Reduction Method

2013 ◽  
Vol 807-809 ◽  
pp. 2805-2808
Author(s):  
Zhao Xia Hou ◽  
Yin Zhou ◽  
Shao Hong Wang ◽  
Mei Han Wang ◽  
Xiao Dan Hu ◽  
...  
Keyword(s):  
Graphite Oxide ◽  
Reduction Method ◽  
Graphene Nanosheets ◽  
Colloidal Suspension ◽  
Exfoliated Graphite ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oxidation Reduction ◽  
Ft Ir

Graphene was prepared by using hydrazine hydrate to reduce the exfoliated graphite oxide nanosheets in the aqueous colloidal suspension. The prepared graphene were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction analysis (XRD) and scanning electron microscope (SEM), respectively. The results showed that part of oxygen containing groups of the exfoliated graphite oxide nanosheets disappeared and the conjugated p bond recovered after reduction. The thickness and size of the graphene nanosheets decreased.

Synthesis and Millimeter Wave Attenuation Properties of the FeCl3-Graphite Intercalation Compound

2013 ◽  
Vol 750-752 ◽  
pp. 908-913
Author(s):  
Ming Shan Zhou ◽  
Yong Ming Zhang
Keyword(s):  
Millimeter Wave ◽  
Wave Attenuation ◽  
Intercalation Compound ◽  
Chemical Oxidation ◽  
Graphite Intercalation Compound ◽  
Structure And Properties ◽  
Mass Ratio ◽  
Graphite Intercalation ◽  
Experimental Parameters ◽  
Composition Structure

The graphite intercalation compound with large exfoliated volume was prepared by chemical oxidation method. The experimental parameters on the exfoliated volume were discussed in detail. It was found that the optimum preparing conditions went as follows: the mass ratio of graphite flakes:C2H5COOH:FeCl3:CrO3=1:2.8:0.3:0.2, the reaction temperature and time were 30 °C and 40 minutes, respectively. The exfoliated volume of GIC reached up to 575 mL·g1 in the conditions. The composition, structure and properties of the graphite intercalation compound were characterized and analyzed by SEM, TG, DSC, VSM techniques. The millimeter wave (MMW) attenuation performances of GIC were investigated by MMW radar measurement device. The results showed that the MMW attenuation properties of FeCl3-GIC are batter than H2SO4-GIC because of its magnetic absorption for millimeter wave.

HClO4–graphite intercalation compound and its thermally exfoliated graphite

2009 ◽  
Vol 63 (18-19) ◽  
pp. 1618-1620 ◽  
Author(s):  
Xing Hai Wei ◽  
Lang Liu ◽  
Jin Xi Zhang ◽  
Jing Li Shi ◽  
Quan Gui Guo
Keyword(s):  
Intercalation Compound ◽  
Exfoliated Graphite ◽  
Graphite Intercalation Compound ◽  
Graphite Intercalation ◽  
Thermally Exfoliated Graphite

Synthesis of a novel lithium–europium graphite intercalation compound

Carbon ◽  
2004 ◽  
Vol 42 (10) ◽  
pp. 2122-2124 ◽  
Author(s):  
Claire Hérold ◽  
Sébastien Pruvost ◽  
Albert Hérold ◽  
Philippe Lagrange
Keyword(s):  
Intercalation Compound ◽  
Graphite Intercalation Compound ◽  
Graphite Intercalation

A TEMPO-catalyzed oxidation-reduction method to probe surface and anhydrous crystalline-core domains of cellulose microfibril bundles

2021 ◽  
Author(s):  
Tanîa M. Shiga ◽  
Haibing Yang ◽  
Bryan W. Penning ◽  
Anna T. Olek ◽  
Maureen C. McCann ◽  
...  
Keyword(s):  
Secondary Wall ◽  
Cellulose Microfibril ◽  
Reduction Method ◽  
Cellulose Microfibrils ◽  
Cotton Fibers ◽  
Uronic Acids ◽  
Oxidation Reduction ◽  
Crystalline Core ◽  
Secondary Wall Formation ◽  
Catalyzed Oxidation

Abstract A modified TEMPO-catalyzed oxidation of the solvent-exposed glucosyl units of cellulose to uronic acids, followed by carboxyl reduction with NaBD 4 to 6-deutero- and 6,6-dideuteroglucosyl units, provided a robust method for determining relative proportions of disordered amorphous, ordered surface chains, and anhydrous core-crystalline residues of cellulose microfibrils inaccessible to TEMPO. Both glucosyl residues of cellobiose units, digested from amorphous chains of cellulose with a combination of cellulase and cellobiohydrolase, were deuterated, whereas those from anhydrous chains were undeuterated. By contrast, solvent-exposed and anhydrous residues alternate in surface chains, so only one of the two residues of cellobiosyl units was labeled. Although current estimates indicate that each cellulose microfibril comprises only 18 to 24 (1 , 4)- b eta-D-glucan chains, we show here that microfibrils of walls of Arabidopsis leaves and maize coleoptiles, and those of secondary wall cellulose of cotton fibers and poplar wood, bundle into much larger macrofibrils, with 67 to 86% of the glucan chains in the anhydrous domain. These results indicate extensive bundling of microfibrils into macrofibrils occurs during both primary and secondary wall formation. We discuss how, beyond lignin, the degree of bundling into macrofibrils contributes an additional recalcitrance factor to lignocellulosic biomass for enzymatic or chemical catalytic conversion to biofuel substrates.

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