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Representative AFM micrographs of (A), starch (B), starch/halloysite, (C) starch/halloysite/Mexican oregano (Lippia berlandieri Schauer) essential oil 1%, and (D) starch/halloysite/Mexican oregano (Lippia berlandieri Schauer) essential oil 2%. Conditions: Static force, set point 55 nN. Area: 50 × 50 μm. Line fit (color intensity): Line fit (A) 0.2 μm, (B) 0.96 μm, (C) 1.35 μm, (D) 1.37 μm.
