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Representative topographical acquisitions obtained by atomic force microscopy in the height and deflection channel, obtained for PMMA (a,b), PMMA + TiO2NPs 1% (c,d), PMMA + TiO2NPs 3% (e,f), PMMA+ HNTs 1% (g,h), PMMA+ HNTs 3% (i,l) substrates.
