Inverted vortex fluidic exfoliation and scrolling of hexagonal-boron nitride |
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| Authors: | Ahmed Hussein Mohammed Al-Antaki Xuan Luo Thaar M. D. Alharbi David P. Harvey Scott Pye Jin Zou Warren Lawrance Colin L. Raston |
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| Affiliation: | Flinders Institute for Nanoscale Science and Technology, College of Science and Engineering, Flinders University, Adelaide SA 5042 Australia.; Department of Chemistry, Faculty of Sciences, Kufa University, Kufa, Najaf Iraq ; Materials Engineering, Centre for Microscopy and Microanalysis, The University of Queensland, Brisbane QLD 4072 Australia ; College of Science and Engineering, Flinders University, Adelaide SA 5042 Australia |
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| Abstract: | Exfoliation or scrolling of hexagonal boron nitride (h-BN) occurs in a vortex fluidic device (VFD) operating under continuous flow, with a tilt angle of −45° relative to the horizontal position. This new VFD processing strategy is effective in avoiding the build-up of material that occurs when the device is operated using the conventional tilt angle of +45°, where the h-BN precursor and scrolls are centrifugally held against the wall of the tube. At a tilt angle of −45° the downward flow aided by gravity facilitates material exiting the tube with the exfoliation of h-BN and formation of h-BN scrolls then optimized by systematically varying the other VFD operating parameters, including flow rate and rotational speed, along with concentration of h-BN and the choice of solvent. Water was the most effective solvent, which enhances the green chemistry metrics of the processing.Exfoliation or scrolling of h-BN occurs in a vortex fluidic device under downward continuous flow. |
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