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11 hydraulic control) and flows near the upper side of a wing or a propeller blade [22]. In this thesis Graphene exfoliation was studied based on two main patterns of vapor cavities namely cavitating vortices (CV) using a kitchen blender and transient isolated bubbles (TIB) using the novel experimental model. Raman spectroscopy is widely used for structural characterization of new carbon-based materials [23]. Therefore, using Raman spectroscopy, the graphitic nature of the samples produced through the blender and the novel experimental model could be compared. Sequentially, the systematic effect of time on graphene exfoliation would be studied using the proposed cavitation model. 2.3 Materials and Method Bovine Serum Albumin (BSA) (CAS: 9048-46-8) and Graphite (powder, <20 μm, synthetic, CAS: 7782-42-5) were purchased from Sigma Aldrich USA for the graphite solution. As for the solvent, deionized water was used. 2.4 Results and Discussion 2.4.1 Effect of cavitating vortices in graphene exfoliation Initially to identify the bubble propagation on the blades of the blender a high-speed image of the bubbles created on the tip of the blades were taken to prove the existence of cavitation. For visibility reasons the images were taken in the presence of water instead of the graphite solution. Thereafter, the graphite solution was introduced to the blender and was run for 30 minutes at a medium speed (Figure 1). The concentration of graphite was kept constant at 20g in eachPDF Image | Hydrodynamic cavitation exfoliation layered graphene nano
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