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Atomic force microscopy, kelvin probe force microscopy and 3D mapping images of three capsule inner surface. (A-C) 3D topography of each capsule. (D-F) 2D surface potential of each capsule. (G-I) 3D topography mapping 2D surface potential of each capsule. G-Cap, gelatin capsule; PEG/G-Cap, gelatin capsule containing 5% PEG4000 as plasticizer; HPMC-Cap, hydroxypropyl methylcellulose capsule; 2D, two dimensional; 3D, three dimensional.
