1.3.4 Surface charge: Zeta potential
Surface charges of nanoparticles were measured with Zetasizer ZS (Malvern Panalytica, Malvern, UK). 1000 µL of each sample were place in the disposable folded capillary cells for the measurement of zeta potential (DTS1070). Each sample was tested 3 times over the course of 15 runs.