Figure 1. Photographs of atomic force microscopy (AFM) of different size of docosanoic acid SLNs (5 μm × 5 μm).

(A) SLNs were prepared with 0.2 g enrofloxacin, 1.8 g docosanoic acid, and 30 ml 4% PVA by using 30 mm sonication probes with 80% amplitude; (B) SLNs were prepared with 0.2 g enrofloxacin, 1.8 g docosanoic acid, and 20 ml 2% PVA by using 6 mm sonication probes with 60% amplitude; (C) SLNs were prepared with 0.2 g enrofloxacin, 1.8 g docosanoic acid and 10 ml 1% PVA by using 3 mm sonication probes with 60% amplitude.