The droplet size and PDI of FNS-NSs were measured using the photon correlation spectroscopy technique (Zetasizer Nano ZS 90; Malvern instrument, UK) at 25 °C in a quartz cell.46 The samples were suitably diluted (1:10) to avoid the multi-scattering phenomenon. The zeta potentials of prepared NSs were also determined using Zetasizer with a detection angle of 90°. The experiment was conducted in triplicate and results were averaged.
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