PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES

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PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES ( production-and-applications-graphene-and-its-composites )

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Chapter 6 – Production of Few Layer Graphene in Aqueous Media for Biological Studies Figure 6.15: SEM images of supernatant from G/HSA-wash, showing leaf like arrangements of HSA molecules with the residual graphene as the nucleation point (shown by arrow marks). The supernatant of the G/HSA-wash was studied to investigate the protein aggregation seen in Figure 6.14b. SEM images (Figure 6.15a,c and e) show self-assembled ‘leaf’-like structures with dendritic distributions and graphene at the nucleation point. During the drying process, the evaporation of water in PBS buffer resulted in rapid aggregation of protein molecules driven by hydrophobic interactions forming such structures. The dendritic architectures could be explained by the diffusion limited- aggregation model,410 in which graphene nucleation at the tip of the leaf structure is an outcome of a diffusion-limited process. Similar results were observed for DNA-HSA411 and silk proteins412, 413 morphology. 187

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