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. 2020 Sep 2;60:102046. doi: 10.1016/j.jddst.2020.102046

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Fig. 2 — SEM photographs of povidone and its derivatives (a) Kollidon 30, (b) Kollidon 90F, (c) Vivapharm PVP K30, (d) Kollidon VA 64, (e) Plasdone S-630, (f) Vivapharm PVP/VA 64, (g) Kollidon CL, (h) Polyplasdone XL 10 and (i) Vivapharm PVPP [3,17,18,20,21].