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4.1.2.7. Summary of different preparation methods Table 4-1: LPE- conditions used - 24-60 5 6-36 0.25-10 4-36 *1000 rpm - 112 ×g, 2000 rpm – 268 ×g, 10000 rpm – 11180 ×g. 4.1.3. Electrochemically exfoliated graphene Chapter 4 – Methods Figure 4.5: Calibration curve for HSA concentration by Ninhydrin method Graphite concentration (mg/ml) Liquid-media Sonication time (hr) Centrifuge conditions (rpm/min)* Solvent/surfactant Concentration (mg/ml) DMF 5 TDOC 1000-10000/20 10000/20 2000/20 NMP - 6-60 1000-10000/20 EggPC 1 36 2000/20 HSA Electrochemical methods, such as electrochemical reduction of GO or direct exfoliation of graphite to graphene are known to be able to produce large diameter FLG (~ 20 μm). Recently Abdelkader et al. exfoliated a graphite cathode to produce FLG sheets with relatively few sp3 defects.123 Electrochemically exfoliated FLG was kindly supplied by Dr. Amr Abdelkader (School of Materials, University of Manchester) with two different mean diameters: 5 μm (termed as FLG-5) and 20 μm (termed as FLG-20). The procedure of electrochemical exfoliation process is published elsewhere.123 These FLG powder was dispersed in 10 ml 110PDF Image | PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES
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