Fig. 5From: Synthesis of Gold Nanoparticles with Buffer-Dependent Variations of Size and Morphology in Biological BuffersPhysical stability of Au NPs: a zeta potential (X-axis) vs. stability at 4 °C (Y-axis); b pH stability of NPs; visualizations of Au NPs with wide-range (c) and-short range (d) pH stability when stored at 4 °C (10~20 mL)Back to article page