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Particle size distribution
(a) Nanoscale zinc oxide particles (mean size 33.1 nm), (b) Chitosan nanoscale particles (mean size 78.8 nm), (c) Neem oil encapsulated (at 3000 ppm) nanoscale zinc oxide particles (mean size 182.9 nm), (d) NSKE encapsulated nanoscale zinc oxide particles (mean size 84.9 nm)
