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(a) Photographs of the diluted NP solution samples, showing no NP precipitation after synthesis for >1.5 years. (b) Zeta potential curves of the diluted NP solution samples and Gaussian function fits to obtain ζavg. (c) Laser light scattering (indicated with dotted arrows) due to laser light collision with NP colloids in aqueous media, showing good colloidal dispersions, whereas no laser light scattering was observed for the vial containing triple-distilled water.
