Zeta potential and size distributions were performed
using a Coulter DELSA 440SX.[15] This system analyses
zeta potential by electrophoretic particle and colloid mobility (0.02–30 mm diameter) in liquid dispersions by making
independent laser Doppler measurements at two different
angles (26.3, 35.2) simultaneously with 256-channel resolution each. The samples were diluted in distilled water
before application in the device sample chamber.