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Carbon nanotubes suspension (a) sonication of multi-walled carbon nanotubes (MWCNTs) in distilled water (DW), (b) sonication of MWCNTs in surfactant (SDBS), (c) sonication of double-walled carbon nanotubes (DWCNTs) in DW, and (d) sonication of DWCNTs in surfactant (SDBS) for 30 min.
