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(a) SEM images of NT (nano titanium dioxide) and NS (nano silica) morphology of nanoparticles (reproduced Copyright 2022, with permission from Elsevier [74]); (b) SEM images of MVCNT with A: 0% MVCNT, B: 0.1% MVCNT, and C: 0.4% MVCNT. (Reproduced Copyright 2022, with permission from Elsevier [21].)
