From: Synthesis and preliminary in vivo evaluations of polyurethane microstructures for transdermal drug delivery
Sample code
Particle size (nm)
Zeta Potential (mV) Mean ± SD
Mean ± SD
Polydispersity index
PU_1
601 ± 142
0.5
18.4 ± 6.2
PU_2
683 ± 242
0.3
27.5 ± 0.4
PU_3
643 ± 201
0.6
13 ± 1.0